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xiaozi 2014-11-21 22:12:00

php 中，`in_array`函数是弱类型比较，强类型比较时，请指定第三个参数为`true`，还可以大大提高程序的性能。

php php 
<?php

$a = 'hello';

var_dump(in_array($a, [0,1,2,3]));

var_dump(in_array($a, [0,1,2,3], true));

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