array_column：将一个多维数组的转换为一个键值对数组

array_column( array $input , $column_key , $index_key)
第一个参数为原始数组,第二个参数(多维数组键名)为新数组的值,第三个参数(多维数组键名)为键.结果为一个键值对数组

$array = [
	['id' => 1,'name' => 'tom','age' => 18],
	['id' => 2,'name' => 'jack','age' => 19],
	['id' => 3,'name' => 'mick','age' => 20],
	['id' => 4,'name' => 'lucy','age' => 21],
	['id' => 5,'name' => 'bill','age' => 22],
];

$arr = array_column($array,'name','id');

echo '<pre>';
print_r($arr);
echo '</pre>';

打印结果：

Array
(
	[1] => tom
	[2] => jack
	[3] => mick
	[4] => lucy
	[5] => bill
)