php5.5 new Array function array_column using _php techniques

PHP5.5 released, which added a new array function Array_column, feel good! But the lower version of PHP to use, you have to implement:
Reference Address: Https://wiki.php.net/rfc/array_column

Copy Code code as follows:

if (!function_exists (' Array_column ')) {
function Array_column ($input, $columnKey, $indexKey =null) {
$columnKeyIsNumber = (Is_numeric ($columnKey))? True:false;
$indexKeyIsNull = (Is_null ($indexKey))? True:false;
$indexKeyIsNumber = (Is_numeric ($indexKey))? True:false;
$result = Array ();
foreach ((array) $input as $key => $row) {
if ($columnKeyIsNumber) {
$tmp = Array_slice ($row, $columnKey, 1);
$tmp = (Is_array ($tmp) &&!empty ($tmp))? Current ($TMP): null;
}else{
$tmp = Isset ($row [$columnKey])? $row [$columnKey]: null;
}
if (! $indexKeyIsNull) {
if ($indexKeyIsNumber) {
$key = Array_slice ($row, $indexKey, 1);
$key = (Is_array ($key) &&!empty ($key))? Current ($key): null;
$key = Is_null ($key)? 0: $key;
}else{
$key = Isset ($row [$indexKey])? $row [$indexKey]: 0;
}
}
$result [$key] = $tmp;
}
return $result;
}
}

Use examples
$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 '
)
);
$firstNames = Array_column ($records, ' first_name ');
Print_r ($firstNames);
/*
Array
(
[0] => John
[1] => Sally
[2] => Jane
[3] => Peter
)
*/

$records = Array (
Array (1, ' John ', ' Doe '),
Array (2, ' Sally ', ' Smith '),
Array (3, ' Jane ', ' Jones ')
);
$lastNames = Array_column ($records, 2);
Print_r ($lastNames);
/*
Array
(
[0] => Doe
[1] => Smith
[2] => Jones
)
*/

$mismatchedColumns = Array (
Array
' A ' => ' foo ',
' B ' => ' Bar ',
' E ' => ' Baz '
),
Array
' A ' => ' Qux ',
' C ' => ' Quux ',
' d ' => ' Corge '
),
Array
' A ' => ' Grault ',
' B ' => ' garply ',
' E ' => ' Waldo '
),
);
$foo = Array_column ($mismatchedColumns, ' A ', ' B ');
Print_r ($foo);
/*
Array
(
[Bar] => foo
[0] => Qux
[Garply] => Grault
)
*/

Array_column is used to get the elements in a two-dimensional array (PHP 5 >= 5.5.0)

Copy Code code as follows:

<?php
Array representing a possible record set returned from a database
$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 ',
)
);

$first _names = Array_column ($records, ' first_name ');
Print_r ($first _names);
?>
Array
(
[0] => John
[1] => Sally
[2] => Jane
[3] => Peter
) <?php
Using the $records array from Example #1
$last _names = Array_column ($records, ' last_name ', ' id ');
Print_r ($last _names);
?>
Array
(
[2135] => Doe
[3245] => Smith
[5342] => Jones
[5623] => Doe
)