Online PHP editor | output for AdKW4

@ 2015-07-10T15:58:20Z

<?php
//{1,22,56,53,34,51,77}这是一个数组，如何不用内部函数和遍历数组的方法判断出 53 在这个数组里。（面试问题）
$arr = array(1,22,56,53,34,51,77);

function find($item, array $arr, array $currentIndex = array(0)) {
    $currentIndex = $currentIndex[0];
    if (!isset($arr[$currentIndex])) {
        return false;
    }

    if (isset($arr[$currentIndex]) && ($item === $arr[$currentIndex])) {
        return true;
    }
    var_dump($currentIndex);

    $currentIndex++;
    $currentIndex = array($currentIndex);
    return find($item, $arr, $currentIndex);
}

$exists = find(53, $arr);
var_dump($exists);

Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: int(0) int(1) int(2) bool(true)
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/AdKW4 on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_ARRAY, expecting '&' or T_VARIABLE or T_CONST in /in/AdKW4 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE or T_CONST in /in/AdKW4 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `'&'' or `T_VARIABLE' or `T_CONST' in /in/AdKW4 on line 5
Process exited with code 255.

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