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@ 2013-03-31T18:48:58Z

<?php
class ColumnKeyClass {
    function __toString() { return 'first_name'; }
}

class IndexKeyClass {
    function __toString() { return 'id'; }
}

class ValueClass {
    function __toString() { return '2135'; }
}


$column_key = new ColumnKeyClass();
$index_key = new IndexKeyClass();
$value = new ValueClass();


// Array representing a possible record set returned from a database
$records = array(
    array(
        'id' => $value,
        'first_name' => 'John',
        'last_name' => 'XXX'
    ),
    array(
        'id' => 3245,
        'first_name' => 'Sally',
        'last_name' => 'Smith'
    ),
);

var_dump($column_key);
var_dump($index_key);
var_dump($value);
var_dump($records[0]['id']);
$firstNames = array_column($records, $column_key, $index_key);
print_r($firstNames);
var_dump($column_key);
var_dump($index_key);
var_dump($value);
var_dump($records[0]['id']);

Output for git.master, git.master_jit: object(ColumnKeyClass)#1 (0) { } object(IndexKeyClass)#2 (0) { } object(ValueClass)#3 (0) { } object(ValueClass)#3 (0) { } Fatal error: Uncaught TypeError: Illegal offset type in /in/1uMqh:38 Stack trace: #0 /in/1uMqh(38): array_column(Array, 'first_name', 'id') #1 {main} thrown in /in/1uMqh on line 38
Process exited with code 255.
Output for rfc.property-hooks: object(ColumnKeyClass)#1 (0) { } object(IndexKeyClass)#2 (0) { } object(ValueClass)#3 (0) { } object(ValueClass)#3 (0) { } Fatal error: Uncaught TypeError: Cannot access offset of type object on array in /in/1uMqh:38 Stack trace: #0 /in/1uMqh(38): array_column(Array, 'first_name', 'id') #1 {main} thrown in /in/1uMqh on line 38
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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