search php array

1//array_search
2$result = array_search("apple", $fruit_array); // return index or false
3
4//in_array
5$result = in_array("apple", $fruit_array); // return true or false

1
2<?php
3$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');
4
5$key = array_search('green', $array); // $key = 2;
6$key = array_search('red', $array);   // $key = 1;
7?>
8
9

1$userdb = array(
2    array(
3        'uid' => '100',
4        'name' => 'Sandra Shush',
5        'pic_square' => 'urlof100'
6    ),
7    array(
8        'uid' => '5465',
9        'name' => 'Stefanie Mcmohn',
10        'pic_square' => 'urlof100'
11    ),
12    array(
13        'uid' => '40489',
14        'name' => 'Michael',
15        'pic_square' => 'urlof40489'
16    )
17);
18