nozavroni /
collections
| 1 | <?php |
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| 13 | trait IsContainer |
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| 14 | { |
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| 15 | |||
| 16 | /** |
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| 17 | * Determine if this collection contains a value. |
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| 18 | * |
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| 19 | * Allows you to pass in a value or a callback function and optionally an index, |
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| 20 | * and tells you whether or not this collection contains that value. |
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| 21 | * If the $index param is specified, only that index will be looked under. |
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| 22 | * |
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| 23 | * @param mixed|callable $value The value to check for |
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| 24 | * @param mixed $index The (optional) index to look under |
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| 25 | * |
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| 26 | * @return bool True if this collection contains $value |
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| 27 | * |
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| 28 | * @todo Maybe add $identical param for identical comparison (===) |
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| 29 | * @todo Allow negative offset for second param |
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| 30 | */ |
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| 31 | public function contains($value, $index = null) |
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| 32 | { |
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| 33 | return (bool) $this->fold(function ($carry, $val, $key) use ($value, $index) { |
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| 34 | if ($carry) { |
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| 35 | return $carry; |
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| 36 | } |
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| 37 | if (is_callable($value)) { |
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| 38 | $found = $value($val, $key); |
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| 39 | } else { |
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| 40 | $found = ($value == $val); |
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| 41 | } |
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| 42 | if ($found) { |
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| 43 | if (is_null($index)) { |
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| 44 | return true; |
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| 45 | } |
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| 46 | if (is_array($index)) { |
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| 47 | return in_array($key, $index); |
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| 48 | } |
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| 49 | |||
| 50 | return $key == $index; |
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| 51 | } |
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| 52 | |||
| 53 | return false; |
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| 54 | }); |
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| 55 | } |
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| 56 | |||
| 57 | abstract public function fold(callable $funk, $initial = null); |
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| 58 | |||
| 59 | } |
