Innmind /
Immutable
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| 1 | <?php |
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| 2 | |||
| 3 | namespace Innmind\Immutable; |
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| 4 | |||
| 5 | use Innmind\Immutable\Exception\SortException; |
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| 6 | use Innmind\Immutable\Exception\OutOfBoundException; |
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| 7 | use Innmind\Immutable\Exception\RuntimeException; |
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| 8 | use Innmind\Immutable\Exception\InvalidArgumentException; |
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| 9 | use Innmind\Immutable\Exception\LogicException; |
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| 10 | |||
| 11 | class Collection implements CollectionInterface |
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| 12 | { |
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| 13 | private $values; |
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| 14 | |||
| 15 | 37 | public function __construct(array $values) |
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| 16 | { |
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| 17 | 37 | $this->values = $values; |
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| 18 | 37 | } |
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| 19 | |||
| 20 | /** |
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| 21 | * {@inheritdoc} |
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| 22 | */ |
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| 23 | 33 | public function toPrimitive() |
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| 24 | { |
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| 25 | 33 | return $this->values; |
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| 26 | } |
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| 27 | |||
| 28 | /** |
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| 29 | * {@inheritdoc} |
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| 30 | */ |
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| 31 | 1 | public function filter(callable $filter = null) |
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| 32 | { |
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| 33 | 1 | if ($filter === null) { |
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| 34 | 1 | $values = array_filter($this->values); |
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| 35 | 1 | } else { |
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| 36 | 1 | $values = array_filter( |
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| 37 | 1 | $this->values, |
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| 38 | 1 | $filter, |
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| 39 | ARRAY_FILTER_USE_BOTH |
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| 40 | 1 | ); |
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| 41 | } |
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| 42 | |||
| 43 | 1 | return new self($values); |
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| 44 | } |
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| 45 | |||
| 46 | /** |
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| 47 | * {@inheritdoc} |
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| 48 | */ |
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| 49 | 1 | public function intersect(CollectionInterface $collection) |
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| 50 | { |
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| 51 | 1 | return new self(array_intersect( |
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| 52 | 1 | $this->values, |
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| 53 | 1 | $collection->toPrimitive() |
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| 54 | 1 | )); |
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| 55 | } |
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| 56 | |||
| 57 | /** |
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| 58 | * {@inheritdoc} |
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| 59 | */ |
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| 60 | 1 | public function chunk($size) |
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| 61 | { |
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| 62 | 1 | return new self(array_chunk($this->values, (int) $size)); |
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| 63 | } |
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| 64 | |||
| 65 | /** |
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| 66 | * {@inheritdoc} |
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| 67 | */ |
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| 68 | 1 | public function shift() |
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| 69 | { |
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| 70 | 1 | $values = $this->values; |
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| 71 | 1 | array_shift($values); |
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| 72 | |||
| 73 | 1 | return new self($values); |
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| 74 | } |
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| 75 | |||
| 76 | /** |
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| 77 | * {@inheritdoc} |
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| 78 | */ |
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| 79 | 1 | public function reduce(callable $reducer, $initial = null) |
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| 80 | { |
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| 81 | 1 | return array_reduce($this->values, $reducer, $initial); |
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| 82 | } |
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| 83 | |||
| 84 | /** |
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| 85 | * {@inheritdoc} |
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| 86 | */ |
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| 87 | 1 | public function search($needle, $strict = true) |
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| 88 | { |
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| 89 | 1 | return array_search($needle, $this->values, (bool) $strict); |
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| 90 | } |
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| 91 | |||
| 92 | /** |
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| 93 | * {@inheritdoc} |
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| 94 | */ |
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| 95 | 1 | public function uintersect(CollectionInterface $collection, callable $intersecter) |
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| 96 | { |
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| 97 | 1 | return new self(array_uintersect( |
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| 98 | 1 | $this->values, |
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| 99 | 1 | $collection->toPrimitive(), |
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| 100 | $intersecter |
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| 101 | 1 | )); |
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| 102 | } |
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| 103 | |||
| 104 | /** |
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| 105 | * {@inheritdoc} |
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| 106 | */ |
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| 107 | 1 | public function keyIntersect(CollectionInterface $collection) |
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| 108 | { |
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| 109 | 1 | return new self(array_intersect_key( |
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| 110 | 1 | $this->values, |
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| 111 | 1 | $collection->toPrimitive() |
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| 112 | 1 | )); |
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| 113 | } |
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| 114 | |||
| 115 | /** |
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| 116 | * {@inheritdoc} |
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| 117 | */ |
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| 118 | 1 | public function map(callable $mapper) |
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| 119 | { |
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| 120 | 1 | return new self(array_map($mapper, $this->values)); |
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| 121 | } |
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| 122 | |||
| 123 | /** |
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| 124 | * {@inheritdoc} |
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| 125 | */ |
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| 126 | 1 | public function pad($size, $value) |
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| 127 | { |
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| 128 | 1 | return new self(array_pad($this->values, (int) $size, $value)); |
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| 129 | } |
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| 130 | |||
| 131 | /** |
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| 132 | * {@inheritdoc} |
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| 133 | */ |
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| 134 | 1 | public function pop() |
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| 135 | { |
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| 136 | 1 | $values = $this->values; |
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| 137 | 1 | array_pop($values); |
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| 138 | |||
| 139 | 1 | return new self($values); |
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| 140 | } |
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| 141 | |||
| 142 | /** |
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| 143 | * {@inheritdoc} |
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| 144 | */ |
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| 145 | 1 | public function sum() |
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| 146 | { |
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| 147 | 1 | return array_sum($this->values); |
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| 148 | } |
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| 149 | |||
| 150 | /** |
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| 151 | * {@inheritdoc} |
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| 152 | */ |
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| 153 | 1 | public function diff(CollectionInterface $collection) |
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| 154 | { |
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| 155 | 1 | return new self(array_diff($this->values, $collection->toPrimitive())); |
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| 156 | } |
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| 157 | |||
| 158 | /** |
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| 159 | * {@inheritdoc} |
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| 160 | */ |
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| 161 | 1 | public function flip() |
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| 162 | { |
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| 163 | 1 | return new self(array_flip($this->values)); |
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| 164 | } |
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| 165 | |||
| 166 | /** |
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| 167 | * {@inheritdoc} |
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| 168 | */ |
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| 169 | 1 | public function keys($search = null, $strict = true) |
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| 170 | { |
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| 171 | 1 | $args = func_get_args(); |
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| 172 | |||
| 173 | 1 | if (count($args) > 0) { |
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| 174 | 1 | $keys = array_keys($this->values, $search, (bool) $strict); |
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| 175 | 1 | } else { |
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| 176 | 1 | $keys = array_keys($this->values); |
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| 177 | } |
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| 178 | |||
| 179 | 1 | return new self($keys); |
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| 180 | } |
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| 181 | |||
| 182 | /** |
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| 183 | * {@inheritdoc} |
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| 184 | */ |
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| 185 | 1 | public function push($value) |
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| 186 | { |
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| 187 | 1 | $values = $this->values; |
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| 188 | 1 | array_push($values, $value); |
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| 189 | |||
| 190 | 1 | return new self($values); |
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| 191 | } |
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| 192 | |||
| 193 | /** |
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| 194 | * {@inheritdoc} |
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| 195 | */ |
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| 196 | 2 | public function rand($num = 1) |
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| 197 | { |
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| 198 | 2 | if ((int) $num > $this->count()) { |
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| 199 | 1 | throw new OutOfBoundException( |
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| 200 | 'Trying to return a wider collection than the current one' |
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| 201 | 1 | ); |
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| 202 | } |
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| 203 | |||
| 204 | 1 | $keys = (array) array_rand($this->values, $num); |
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| 205 | 1 | $values = []; |
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| 206 | |||
| 207 | 1 | foreach ($keys as $key) { |
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| 208 | 1 | $values[$key] = $this->values[$key]; |
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| 209 | 1 | } |
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| 210 | |||
| 211 | 1 | return new self($values); |
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| 212 | } |
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| 213 | |||
| 214 | /** |
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| 215 | * {@inheritdoc} |
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| 216 | */ |
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| 217 | 1 | public function merge(CollectionInterface $collection) |
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| 218 | { |
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| 219 | 1 | return new self(array_merge( |
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| 220 | 1 | $this->values, |
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| 221 | 1 | $collection->toPrimitive() |
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| 222 | 1 | )); |
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| 223 | } |
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| 224 | |||
| 225 | /** |
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| 226 | * {@inheritdoc} |
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| 227 | */ |
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| 228 | 1 | public function slice($offset, $length = null, $preserveKeys = false) |
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| 229 | { |
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| 230 | 1 | return new self(array_slice( |
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| 231 | 1 | $this->values, |
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| 232 | 1 | (int) $offset, |
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| 233 | 1 | $length === null ? null : (int) $length, |
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| 234 | (bool) $preserveKeys |
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| 235 | 1 | )); |
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| 236 | } |
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| 237 | |||
| 238 | /** |
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| 239 | * {@inheritdoc} |
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| 240 | */ |
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| 241 | 1 | public function udiff(CollectionInterface $collection, callable $differ) |
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| 242 | { |
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| 243 | 1 | return new self(array_udiff( |
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| 244 | 1 | $this->values, |
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| 245 | 1 | $collection->toPrimitive(), |
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| 246 | $differ |
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| 247 | 1 | )); |
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| 248 | } |
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| 249 | |||
| 250 | /** |
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| 251 | * {@inheritdoc} |
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| 252 | */ |
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| 253 | 1 | public function column($key, $indexKey = null) |
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| 254 | { |
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| 255 | 1 | return new self(array_column( |
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| 256 | 1 | $this->values, |
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| 257 | 1 | $key, |
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| 258 | $indexKey |
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| 259 | 1 | )); |
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| 260 | } |
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| 261 | |||
| 262 | /** |
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| 263 | * {@inheritdoc} |
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| 264 | */ |
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| 265 | 1 | public function splice($offset, $length = 0, $replacement = []) |
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| 266 | { |
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| 267 | 1 | $values = $this->values; |
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| 268 | 1 | array_splice($values, (int) $offset, (int) $length, $replacement); |
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| 269 | |||
| 270 | 1 | return new self($values); |
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| 271 | } |
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| 272 | |||
| 273 | /** |
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| 274 | * {@inheritdoc} |
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| 275 | */ |
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| 276 | 1 | public function unique($flags = SORT_REGULAR) |
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| 277 | { |
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| 278 | 1 | return new self(array_unique($this->values, (int) $flags)); |
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| 279 | } |
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| 280 | |||
| 281 | /** |
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| 282 | * {@inheritdoc} |
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| 283 | */ |
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| 284 | 1 | public function values() |
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| 285 | { |
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| 286 | 1 | return new self(array_values($this->values)); |
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| 287 | } |
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| 288 | |||
| 289 | /** |
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| 290 | * {@inheritdoc} |
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| 291 | */ |
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| 292 | 1 | public function product() |
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| 293 | { |
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| 294 | 1 | return array_product($this->values); |
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| 295 | } |
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| 296 | |||
| 297 | /** |
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| 298 | * {@inheritdoc} |
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| 299 | */ |
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| 300 | 1 | public function replace(CollectionInterface $collection) |
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| 301 | { |
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| 302 | 1 | return new self(array_replace( |
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| 303 | 1 | $this->values, |
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| 304 | 1 | $collection->toPrimitive() |
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| 305 | 1 | )); |
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| 306 | } |
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| 307 | |||
| 308 | /** |
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| 309 | * {@inheritdoc} |
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| 310 | */ |
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| 311 | 1 | public function reverse($preserveKeys = false) |
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| 312 | { |
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| 313 | 1 | return new self(array_reverse($this->values, (bool) $preserveKeys)); |
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| 314 | } |
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| 315 | |||
| 316 | /** |
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| 317 | * {@inheritdoc} |
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| 318 | */ |
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| 319 | 1 | public function unshift($value) |
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| 320 | { |
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| 321 | 1 | $values = $this->values; |
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| 322 | 1 | array_unshift($values, $value); |
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| 323 | |||
| 324 | 1 | return new self($values); |
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| 325 | } |
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| 326 | |||
| 327 | /** |
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| 328 | * {@inheritdoc} |
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| 329 | */ |
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| 330 | 1 | public function keyDiff(CollectionInterface $collection) |
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| 331 | { |
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| 332 | 1 | return new self(array_diff_key( |
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| 333 | 1 | $this->values, |
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| 334 | 1 | $collection->toPrimitive() |
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| 335 | 1 | )); |
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| 336 | } |
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| 337 | |||
| 338 | /** |
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| 339 | * {@inheritdoc} |
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| 340 | */ |
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| 341 | 1 | public function ukeyDiff(CollectionInterface $collection, callable $differ) |
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| 342 | { |
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| 343 | 1 | return new self(array_diff_ukey( |
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| 344 | 1 | $this->values, |
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| 345 | 1 | $collection->toPrimitive(), |
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| 346 | $differ |
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| 347 | 1 | )); |
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| 348 | } |
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| 349 | |||
| 350 | /** |
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| 351 | * {@inheritdoc} |
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| 352 | */ |
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| 353 | 1 | public function associativeDiff(CollectionInterface $collection) |
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| 354 | { |
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| 355 | 1 | return new self(array_diff_assoc( |
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| 356 | 1 | $this->values, |
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| 357 | 1 | $collection->toPrimitive() |
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| 358 | 1 | )); |
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| 359 | } |
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| 360 | |||
| 361 | /** |
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| 362 | * {@inheritdoc} |
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| 363 | */ |
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| 364 | 1 | public function hasKey($key, $strict = true) |
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| 365 | { |
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| 366 | 1 | if ((bool) $strict === true) { |
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| 367 | 1 | $bool = array_key_exists($key, $this->values); |
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| 368 | 1 | } else { |
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| 369 | 1 | $bool = isset($this->values[$key]); |
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| 370 | } |
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| 371 | |||
| 372 | 1 | return $bool; |
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| 373 | } |
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| 374 | |||
| 375 | /** |
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| 376 | * {@inheritdoc} |
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| 377 | */ |
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| 378 | 1 | public function countValues() |
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| 379 | { |
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| 380 | 1 | return new self(array_count_values($this->values)); |
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| 381 | } |
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| 382 | |||
| 383 | /** |
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| 384 | * {@inheritdoc} |
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| 385 | */ |
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| 386 | 1 | public function ukeyIntersect(CollectionInterface $collection, callable $intersecter) |
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| 387 | { |
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| 388 | 1 | return new self(array_intersect_ukey( |
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| 389 | 1 | $this->values, |
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| 390 | 1 | $collection->toPrimitive(), |
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| 391 | $intersecter |
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| 392 | 1 | )); |
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| 393 | } |
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| 394 | |||
| 395 | /** |
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| 396 | * {@inheritdoc} |
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| 397 | */ |
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| 398 | 1 | public function associativeIntersect(CollectionInterface $collection) |
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| 399 | { |
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| 400 | 1 | return new self(array_intersect_assoc( |
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| 401 | 1 | $this->values, |
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| 402 | 1 | $collection->toPrimitive() |
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| 403 | 1 | )); |
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| 404 | } |
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| 405 | |||
| 406 | /** |
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| 407 | * {@inheritdoc} |
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| 408 | */ |
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| 409 | View Code Duplication | public function sort($flags = SORT_REGULAR) |
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| 410 | { |
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| 411 | $values = $this->values; |
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| 412 | $bool = sort($values, (int) $flags); |
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| 413 | |||
| 414 | if ($bool === false) { |
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| 415 | throw new SortException('Sort failure'); |
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| 416 | } |
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| 417 | |||
| 418 | return new self($values); |
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| 419 | } |
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| 420 | |||
| 421 | /** |
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| 422 | * {@inheritdoc} |
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| 423 | */ |
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| 424 | View Code Duplication | public function associativeSort($flags = SORT_REGULAR) |
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| 425 | { |
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| 426 | $values = $this->values; |
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| 427 | $bool = asort($values, (int) $flags); |
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| 428 | |||
| 429 | if ($bool === false) { |
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| 430 | throw new SortException('Sort failure'); |
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| 431 | } |
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| 432 | |||
| 433 | return new self($values); |
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| 434 | } |
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| 435 | |||
| 436 | /** |
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| 437 | * {@inheritdoc} |
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| 438 | */ |
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| 439 | View Code Duplication | public function keySort($flags = SORT_REGULAR) |
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| 440 | { |
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| 441 | $values = $this->values; |
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| 442 | $bool = ksort($values, (int) $flags); |
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| 443 | |||
| 444 | if ($bool === false) { |
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| 445 | throw new SortException('Sort failure'); |
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| 446 | } |
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| 447 | |||
| 448 | return new self($values); |
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| 449 | } |
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| 450 | |||
| 451 | /** |
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| 452 | * {@inheritdoc} |
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| 453 | */ |
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| 454 | View Code Duplication | public function ukeySort(callable $sorter) |
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| 455 | { |
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| 456 | $values = $this->values; |
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| 457 | $bool = uksort($values, $sorter); |
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| 458 | |||
| 459 | if ($bool === false) { |
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| 460 | throw new SortException('Sort failure'); |
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| 461 | } |
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| 462 | |||
| 463 | return new self($values); |
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| 464 | } |
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| 465 | |||
| 466 | /** |
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| 467 | * {@inheritdoc} |
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| 468 | */ |
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| 469 | View Code Duplication | public function reverseSort($flags = SORT_REGULAR) |
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| 470 | { |
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| 471 | $values = $this->values; |
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| 472 | $bool = rsort($values, (int) $flags); |
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| 473 | |||
| 474 | if ($bool === false) { |
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| 475 | throw new SortException('Sort failure'); |
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| 476 | } |
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| 477 | |||
| 478 | return new self($values); |
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| 479 | } |
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| 480 | |||
| 481 | /** |
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| 482 | * {@inheritdoc} |
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| 483 | */ |
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| 484 | View Code Duplication | public function usort(callable $sorter) |
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| 485 | { |
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| 486 | $values = $this->values; |
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| 487 | $bool = usort($values, $sorter); |
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| 488 | |||
| 489 | if ($bool === false) { |
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| 490 | throw new SortException('Sort failure'); |
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| 491 | } |
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| 492 | |||
| 493 | return new self($values); |
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| 494 | } |
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| 495 | |||
| 496 | /** |
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| 497 | * {@inheritdoc} |
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| 498 | */ |
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| 499 | View Code Duplication | public function associativeReverseSort($flags = SORT_REGULAR) |
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| 500 | { |
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| 501 | $values = $this->values; |
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| 502 | $bool = arsort($values, (int) $flags); |
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| 503 | |||
| 504 | if ($bool === false) { |
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| 505 | throw new SortException('Sort failure'); |
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| 506 | } |
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| 507 | |||
| 508 | return new self($values); |
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| 509 | } |
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| 510 | |||
| 511 | /** |
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| 512 | * {@inheritdoc} |
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| 513 | */ |
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| 514 | View Code Duplication | public function keyReverseSort($flags = SORT_REGULAR) |
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| 515 | { |
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| 516 | $values = $this->values; |
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| 517 | $bool = krsort($values, (int) $flags); |
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| 518 | |||
| 519 | if ($bool === false) { |
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| 520 | throw new SortException('Sort failure'); |
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| 521 | } |
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| 522 | |||
| 523 | return new self($values); |
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| 524 | } |
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| 525 | |||
| 526 | /** |
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| 527 | * {@inheritdoc} |
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| 528 | */ |
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| 529 | View Code Duplication | public function uassociativeSort(callable $sorter) |
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| 530 | { |
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| 531 | $values = $this->values; |
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| 532 | $bool = uasort($values, $sorter); |
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| 533 | |||
| 534 | if ($bool === false) { |
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| 535 | throw new SortException('Sort failure'); |
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| 536 | } |
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| 537 | |||
| 538 | return new self($values); |
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| 539 | } |
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| 540 | |||
| 541 | /** |
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| 542 | * {@inheritdoc} |
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| 543 | */ |
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| 544 | public function naturalSort() |
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| 545 | { |
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| 546 | $values = $this->values; |
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| 547 | $bool = natsort($values); |
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| 548 | |||
| 549 | if ($bool === false) { |
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| 550 | throw new SortException('Sort failure'); |
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| 551 | } |
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| 552 | |||
| 553 | return new self($values); |
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| 554 | } |
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| 555 | |||
| 556 | /** |
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| 557 | * {@inheritdoc} |
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| 558 | */ |
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| 559 | View Code Duplication | public function first() |
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| 560 | { |
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| 561 | if ($this->count() === 0) { |
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| 562 | throw new OutOfBoundException('There is no first item'); |
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| 563 | } |
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| 564 | |||
| 565 | return array_values($this->values)[0]; |
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| 566 | } |
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| 567 | |||
| 568 | /** |
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| 569 | * {@inheritdoc} |
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| 570 | */ |
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| 571 | View Code Duplication | public function last() |
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| 572 | { |
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| 573 | if ($this->count() === 0) { |
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| 574 | throw new OutOfBoundException('There is no last item'); |
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| 575 | } |
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| 576 | |||
| 577 | $values = array_values($this->values); |
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| 578 | |||
| 579 | return end($values); |
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| 580 | } |
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| 581 | |||
| 582 | /** |
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| 583 | * {@inheritdoc} |
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| 584 | */ |
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| 585 | public function each(callable $callback) |
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| 586 | { |
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| 587 | foreach ($this->values as $key => $value) { |
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| 588 | $callback($key, $value); |
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| 589 | } |
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| 590 | |||
| 591 | return $this; |
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| 592 | } |
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| 593 | |||
| 594 | /** |
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| 595 | * {@inheritdoc} |
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| 596 | */ |
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| 597 | public function join($separator) |
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| 598 | { |
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| 599 | return implode((string) $separator, $this->values); |
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| 600 | } |
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| 601 | |||
| 602 | /** |
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| 603 | * {@inheritdoc} |
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| 604 | */ |
||
| 605 | public function shuffle() |
||
| 606 | { |
||
| 607 | $values = $this->values; |
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| 608 | $result = shuffle($values); |
||
| 609 | |||
| 610 | if ($result === false) { |
||
| 611 | throw new RuntimeException('Shuffle operation failed'); |
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| 612 | } |
||
| 613 | |||
| 614 | return new self($values); |
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| 615 | } |
||
| 616 | |||
| 617 | /** |
||
| 618 | * {@inheritdoc} |
||
| 619 | */ |
||
| 620 | public function take($size, $preserveKeys = false) |
||
| 621 | { |
||
| 622 | $took = []; |
||
| 623 | $keys = array_keys($this->values); |
||
| 624 | $size = (int) $size; |
||
| 625 | |||
| 626 | while (count($took) < $size) { |
||
| 627 | $random = mt_rand(0, count($keys) - 1); |
||
| 628 | $key = $keys[$random]; |
||
| 629 | $took[$key] = $this->values[$key]; |
||
| 630 | unset($keys[$random]); |
||
| 631 | } |
||
| 632 | |||
| 633 | if ($preserveKeys === false) { |
||
| 634 | $took = array_values($took); |
||
| 635 | } |
||
| 636 | |||
| 637 | return new self($took); |
||
| 638 | } |
||
| 639 | |||
| 640 | /** |
||
| 641 | * {@inheritdoc} |
||
| 642 | */ |
||
| 643 | 2 | public function count() |
|
| 644 | { |
||
| 645 | 2 | return count($this->values); |
|
| 646 | } |
||
| 647 | |||
| 648 | /** |
||
| 649 | * {@inheritdoc} |
||
| 650 | */ |
||
| 651 | public function current() |
||
| 652 | { |
||
| 653 | return current($this->values); |
||
| 654 | } |
||
| 655 | |||
| 656 | /** |
||
| 657 | * {@inheritdoc} |
||
| 658 | */ |
||
| 659 | public function key() |
||
| 660 | { |
||
| 661 | return key($this->values); |
||
| 662 | } |
||
| 663 | |||
| 664 | /** |
||
| 665 | * {@inheritdoc} |
||
| 666 | */ |
||
| 667 | public function next() |
||
| 668 | { |
||
| 669 | next($this->values); |
||
| 670 | } |
||
| 671 | |||
| 672 | /** |
||
| 673 | * {@inheritdoc} |
||
| 674 | */ |
||
| 675 | public function rewind() |
||
| 676 | { |
||
| 677 | reset($this->values); |
||
| 678 | } |
||
| 679 | |||
| 680 | /** |
||
| 681 | * {@inheritdoc} |
||
| 682 | */ |
||
| 683 | public function valid() |
||
| 684 | { |
||
| 685 | return $this->key() !== null; |
||
| 686 | } |
||
| 687 | |||
| 688 | /** |
||
| 689 | * {@inheritdoc} |
||
| 690 | */ |
||
| 691 | public function offsetExists($offset) |
||
| 692 | { |
||
| 693 | return $this->hasKey($offset); |
||
| 694 | } |
||
| 695 | |||
| 696 | /** |
||
| 697 | * {@inheritdoc} |
||
| 698 | */ |
||
| 699 | public function offsetGet($offset) |
||
| 700 | { |
||
| 701 | if (!$this->hasKey($offset)) { |
||
| 702 | throw new InvalidArgumentException(sprintf( |
||
| 703 | 'Unknown index %s', |
||
| 704 | $offset |
||
| 705 | )); |
||
| 706 | } |
||
| 707 | |||
| 708 | return $this->values[$offset]; |
||
| 709 | } |
||
| 710 | |||
| 711 | /** |
||
| 712 | * {@inheritdoc} |
||
| 713 | */ |
||
| 714 | public function offsetSet($offset, $value) |
||
| 715 | { |
||
| 716 | throw new LogicException('You can\'t modify an immutable collection'); |
||
| 717 | } |
||
| 718 | |||
| 719 | /** |
||
| 720 | * {@inheritdoc} |
||
| 721 | */ |
||
| 722 | public function offsetUnset($offset) |
||
| 723 | { |
||
| 724 | throw new LogicException('You can\'t modify an immutable collection'); |
||
| 725 | } |
||
| 726 | } |
||
| 727 |
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: