class IArray extends ArrayObject { static function make($array) { return new self($array); } function map($func) { $res = new self(); foreach ($this as $k => $v) { $res[$k] = $func($k, $v); } return $res; } function filter($func) { $res = new self(); foreach ($this as $k => $v) { if ($func($k, $v)) { $res[$k] = $v; } } return $res; } } $nums = array(10,20,30,40); $res = IArray::make($nums)->filter(function($k, $v) { return $v > 15; })->map(function($k, $v) { return $v * 2; }); print_r($res);
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