array_search（）函数，第3个参数，有什么功用

array_search（）函数，第3个参数，有什么作用？
http://docs.php.net/manual/zh/function.array-search.php

<br />
mixed array_search ( mixed $needle , array $haystack [, bool $strict = false ] )<br />

strict
如果可选的第三个参数 strict 为 TRUE，则 array_search() 将在 haystack 中检查完全相同的元素。 这意味着同样检查 haystack 里 needle 的 类型，并且对象需是同一个实例。


问题：
这个函数，第3个参数：$strict = false，有什么作用？
给个实例。

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------解决方案--------------------

$ar = array(1, 2, 3);<br />
var_dump(array_search('2', $ar, true)); //bool(false)<br />
var_dump(array_search(2, $ar)); //int(1)<br />
<br />

------解决方案--------------------
$a = array("a"=>"5","b"=>5);
echo array_search(5,$a);不用判断值的类型 所以字符串"5" 匹配成功
echo '
';
echo array_search(5,$a,true);需要判断值的类型 所以字符串"5" 匹配不成功 数字5匹配成功

Related labels：

array nbsp search

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