This simple library provides functionality for array_column()
to versions of PHP earlier than 5.5. It mimics the functionality of the built-in
function in every way.
PHP数组值循环处理成下标，并且可以指定一维取值
array array_column(array $input, mixed $columnKey[, mixed $indexKey])
Given a multi-dimensional array of data, array_column() returns the values
from a single column of the input array, identified by the $columnKey.
Optionally, you may provide an $indexKey to index the values in the returned
array by the values from the $indexKey column in the input array.
For example, using the following array of data, we tell array_column() to
return an array of just the last names, indexed by their record IDs.
<?php
$records = array(
array(
'id' => 1000, 'name' => '百度',
'web' => array( 'http://www.baidu.com/','http://baike.baidu.com/' )
),
array( 'id' => 1001, 'name' => '腾讯',
'web' => array( 'http://www.qq.com/' ,'http://v.qq.com/')
),
array(
'id' => 1002, 'name' => '阿里',
'web' => array( 'http://www.taobao.com/' , 'http://www.tmall.com/')
)
);测试
// 输出指定键
print_r( array_column( $records, 'name' , 'id' ) ) ;
Array
(
[1000] => 百度
[1001] => 腾讯
[1002] => 阿里
)
//输出所有
print_r( array_column( $records, null , 'id' ) ) ;
Array
(
[1000] => Array
(
[id] => 1000
[name] => 百度
[web] => Array
(
[0] => http://www.baidu.com/
[1] => http://baike.baidu.com/
)
)
[1001] => Array
(
[id] => 1001
[name] => 腾讯
[web] => Array
(
[0] => http://www.qq.com/
[1] => http://v.qq.com/
)
)
[1002] => Array
(
[id] => 1002
[name] => 阿里
[web] => Array
(
[0] => http://www.taobao.com/
[1] => http://www.tmall.com/
)
)
)