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run code in 200+ php & hhvm versions
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<?php class A { static function cast(&$val, $key) { if (is_numeric($val)) { //return $val + 0; $val += 0; } //return 0; //return $val; } static function run() { $arr = ['stri33ng123', 84, 76.7, '45.6', '67.5e45', '56,9']; var_dump($arr); array_walk($arr , 'cast'); var_dump($arr); } } A::run();