<?php function array_filter_(array $data, callable $callback) { $filtered = []; foreach ($data as $key => $value) { if ($callback($value)) { $filtered[$key] = $data[$key]; } } return $filtered; } $data = ['foo', 'bar']; var_dump($data); $filtered = array_filter_($data, function (&$value) { $value = (bool) $value; return true; }); var_dump($filtered);
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