# PHP小技巧 # ## array_map() ``` echo "<pre>"; print_r(array_map(function ($num) {return $num * 2;}, [1,2,3])); echo "</pre>"; /* 打印结果： Array ( [0] => 2 [1] => 4 [2] => 6 ) */ ``` ## array_walk() ## (array)变量 ``` $args['uid'] = 1; if (!is_array($args['uid'])) { $args['uid'] = (array)$args['uid']; } echo "<pre>"; print_r($args); echo "</pre>"; ```