PHP gets the specified value position in the array

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Use php array_search function

<?php
    //定义一个数组
    $array = array(0 => &#39;a&#39;, 1 => &#39;b&#39;, 2 => &#39;c&#39;, 3 => &#39;d&#39;);
    //使用 array_search(&#39;要搜索的值&#39;,数组);
    $key = array_search(&#39;b&#39;, $array); // $key = 1;
    $key = array_search(&#39;a&#39;, $array);   // $key = 0;
?>

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