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<?php |
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namespace Spindle\Collection\Traits; |
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trait SetsTrait |
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{ |
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/** |
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* @param int $size |
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* @return \Spindle\Collection\Collection |
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*/ |
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public function chunk($size) |
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{ |
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return new $this(array_chunk($this->toArray(), $size), $this->debug); |
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} |
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/** |
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* @return \Spindle\Collection\Collection |
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*/ |
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public function unique() |
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{ |
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return new $this(array_unique($this->toArray()), $this->debug); |
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} |
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/** |
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* @return \Spindle\Collection\Collection |
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*/ |
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public function groupBy($fn) |
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{ |
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$array = $this->toArray(); |
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$mapped = (new $this($array))->map($fn)->toArray(); |
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$grouped = []; |
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foreach ($mapped as $key => $val) { |
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$grouped[$val][$key] = $array[$key]; |
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} |
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return new $this($grouped, $this->debug); |
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} |
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/** |
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* SQL's LEFT JOIN |
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* - in order to avoid N+1 problem |
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*/ |
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public function leftJoin($map, callable $fetch, callable $combine) |
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{ |
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$array = $this->toArray(); |
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if ($map) { |
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$mapped = (new $this($array))->groupBy($map)->toArray(); |
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} else { |
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$mapped = []; |
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foreach ($array as $key => $val) { |
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$mapped[$key] = [$key]; |
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} |
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} |
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$keys = array_keys($mapped); |
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$fetched = $fetch($keys); |
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if (!is_array($fetched)) { |
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throw new \UnexpectedValueException( |
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'leftJoin($map, $fetch, $combine) $fetch must be function-type [key1, key2, ...] => [key1 => val1, ...]' |
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); |
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} |
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foreach ($fetched as $key => $val) { |
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if (!isset($mapped[$key])) { |
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throw new \UnexpectedValueException( |
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'leftJoin($map, $fetch, $combine) $fetch returned an array having unexpected key: ' . $key |
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); |
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} |
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foreach ($mapped[$key] as $originKey) { |
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$array[$originKey] = $combine($array[$originKey], $val); |
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} |
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} |
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return new $this($array, $this->debug); |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: