php - Array_search 出现故障？

Question

前几行只是为了仔细检查所有变量是否符合要求。他们都给出了正确的数据。

print_r($stack) 确实给出了上述数组元素，（+ 和更多元素）

<?php
$item_name = $_POST['item_name']; 
echo $item_name.'<br/><br/>'; // IBM-3246785
print_r($stack);   // Array ( [0] => IBM-3246785 [1] => IBM-3567465 [2] => IBM-4579645 [3] => [4] => IBM-1234567 [5] => [6] => IBM-12345678 [7] => [8] => IBM-24374365 )            

$key = array_search($item_name, $stack);
if ($key !== false) {
    echo "The key where find was found is:" . $key;
} else{
    echo $item_name . " was NOT FOUND in the array";
};
?>

数组搜索每次都返回错误！！！尝试用 IBM-3246785 替换 $item_name - 问题仍然存在。无法让它返回所选“item_name”的索引/键。

Answer 1

我刚刚在这里运行了这段代码---

<?php

$item_name = "IBM-3246785";
$stack = Array (0 => 'IBM-3246785', 1 => 'IBM-3567465', 2 => 'IBM-4579645', 3 => 'IBM-1234567',4 => 'IBM-12345678', 5 => 'IBM-24374365');


$key = array_search($item_name, $stack);
if ($key !== false) {
    echo "The key where find was found is:" . $key;
} else{
    echo $item_name . " was NOT FOUND in the array";
};
?>

它返回了 - 找到 find 的键是：0

Answer 2

您可以尝试比较 $item_name 和 $stack[0]，例如if ($item_name == $stack[0]) echo "Done"; 您可以先尝试检查是否为 false，例如if ($key === false) echo "Not"; else echo "Is"; ，也许您可​​以尝试不同的函数来检索正确的数组键。