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<?php
//定义一个数组
$array = array(0 => 'a', 1 => 'b', 2 => 'c', 3 => 'd');
//使用 array_search('要搜索的值',数组);
$key = array_search('b', $array); // $key = 1;
$key = array_search('a', $array); // $key = 0;
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