<?php
$userdb = array(
0 => array(
'uid' => 100,
'name' => 'Sandra Shush',
'url' => 'urlof100'
),
1 => array(
'uid' => 5465,
'name' => 'Stefanie Mcmohn',
'pic_square' => 'urlof100'
),
2 => Array(
'uid' => 40489,
'name' => 'Michael',
'pic_square' => 'urlof40489'
)
);
//var_dump(array_search(40489, array_column($userdb, 'uid')));
//考虑到性能问题，如果数组过大，array_search每次都要执行array_column()，两个函数需要分开写
$uID= array_column($userdb,'uid');
var_dump(array_search(40489, $uID));//存在返回下标，不存在返回false
| 
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