<?php
$arr = [
[
'id' => 1,
'name' => 'a'
],[
'id' => 2,
'name' => 'b',
], [
'id' => 4,
'name' => 'c'
], [
'id' => 3,
'name' => 'd'
]
];
print_r(array_column($arr,'name'));
//运行结果：Array ( [0] => a [1] => b [2] => c [3] => d )
print_r(array_column($arr,'name','id'));
//运行结果：Array ( [1] => a [2] => b [4] => c [3] => d )
print_r(array_column($arr, null, 'name'));
//运行结果：Array ( [a] => Array ( [id] => 1 [name] => a ) [b] => Array ( [id] => 2 [name] => b ) [c] => Array ( [id] => 4 [name] => c ) [d] => Array ( [id] => 3 [name] => d ) )
