update your script like below and check it please but it will work only in PHP 5.5 greater than version only...
$_test = = array(
array(
'id' => 1001,
'first_name' => 'kalpesh',
'last_name' => 'gamit',
),
array(
'id' => 1002,
'first_name' => 'kartik',
'last_name' => 'patel',
),
array(
'id' => 2002,
'first_name' => 'smith',
'last_name' => 'Jones',
),
array(
'id' => 4004,
'first_name' => 'patel',
'last_name' => 'Doe',
)
);
$ids_only = array_column($records, 'id');
print_r($ids_only);
Results for ID
Array
(
[0] => 1001
[1] => 1002
[2] => 2002
[3] => 4004
)
Results for first_name
$first_name = array_column($records, 'id');
print_r($first_name);
Array
(
[0] => Kalpesh
[1] => kartik
[2] => smith
[3] => patel
)
run above php script and please check....
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