$records= array(
array(
'id'=>2135,
'first_name'=>'John',
'last_name'=>'Doe',
),
array(
'id'=>3245,
'first_name'=>'Sally',
'last_name'=>'Smith',
),
array(
'id'=>5342,
'first_name'=>'Jane',
'last_name'=>'Jones',
),
array(
'id'=>5623,
'first_name'=>'Peter',
'last_name'=>'Doe',
)
);
$last_names=array_column($records,'last_name','id');
print_r($last_names);
以上例程会输出：
Array
(
[2135] => Doe
[3245] => Smith
[5342] => Jones
[5623] => Doe
)
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