$arry_a = array(0, 1, 2);

$arry_b = array('dongsir','董先生','董先生的CSDN博客');

$arry_ab = [];

foreach ($arry_b as $key => $value) {

    $arry_ab[$arry_a[$key]] = $value;

}

echo "<pre>";

print_r($arry_ab);

public function test()

{

　　$arry_a = array(0, 1, 2);

　　$arry_b = array('dongsir','董先生','董先生的CSDN博客');

　　$arry_ab = array_combine($arry_a ,$arry_b );

　　print_r($arry_ab);
}

<?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'

        )

);

$found_key = array_search(40489, array_column($userdb, 'uid'));

/**

    如果$userdb很大，建议使用一个变量，避免搜索每个元素时都调用array_column()

    $uid = array_column($userdb, 'uid');

    $found_key = array_search(40489, $uid);

 */

var_dump($found_key);//返回查询到的值的key--2

 ?>

 1 $ar = array(

 2     2 => array(

 3         'catid' => 2,

 4         'catdir' => 'notice',

 5     ),

 6     5 => array(

 7         'catid' => 5,

 8         'catdir' => 'subject',

 9     ),

10     6=> array(

11         'catid' => 6,

12         'catdir' => 'news'

13     ),

14 );

15

16 $catid = 5;

17 $r = array_filter($ar, function($t) use ($catid) { return $t['catid'] == $catid; });

18 print_r($r);

1 Array

2 (

3     [5] => Array

4         (

5             [catid] => 5

6             [catdir] => subject

7         )

8

9 )

$count = count($article);//总条数

$start=($page-1)*$pagesize;//偏移量，当前页-1乘以每页显示条数

$article = array_slice($article,$start,$pagesize);