Online PHP editor | rfc for aGq6E

@ 2026-08-28T23:12:54Z

<?php

//define('ARRAY_FILTER_USE_VALUE', 0);
echo ARRAY_FILTER_USE_VALUE, PHP_EOL;
echo ARRAY_FILTER_USE_BOTH, PHP_EOL;
echo ARRAY_FILTER_USE_KEY, PHP_EOL;

$arr = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4];

echo '===== THESE ARE VALID AND CORRECT =====', PHP_EOL;

echo '------ $mode is PHP constant -------------', PHP_EOL;

var_dump(array_filter($arr, function($v) {
    return $v == 4;
}, ARRAY_FILTER_USE_VALUE));

var_dump(array_filter($arr, function($v, $k) {
    return $k == 'b' || $v == 4;
}, ARRAY_FILTER_USE_BOTH));

var_dump(array_filter($arr, function($k) {
    return $k == 'b';
}, ARRAY_FILTER_USE_KEY));

echo '------ $mode is integer -------------', PHP_EOL;

var_dump(array_filter($arr, function($v) {
    return $v == 4;
}, 0));

var_dump(array_filter($arr, function($v, $k) {
    return $k == 'b' || $v == 4;
}, 1));

var_dump(array_filter($arr, function($k) {
    return $k == 'b';
}, 2));

echo '===== THE BEHAVIOUR HERE IS UNEXPECTED, I WOULD EXPECT A TYPEERROR =====', PHP_EOL;

echo '------- $mode is text string ------------', PHP_EOL;

var_dump(array_filter($arr, function($v) {
    return $v == 4;
}, '0'));

var_dump(array_filter($arr, function($v, $k) {
    return $k == 'b' || $v == 4;
}, '1'));

var_dump(array_filter($arr, function($k) {
    return $k == 'b';
}, '2'));

echo '------ $mode is float -------------', PHP_EOL;

var_dump(array_filter($arr, function($v) {
    return $v == 4;
}, 0.2));

var_dump(array_filter($arr, function($v, $k) {
    return $k == 'b' || $v == 4;
}, 1.3));

var_dump(array_filter($arr, function($k) {
    return $k == 'b';
}, 2.2));

echo '------ $mode is boolean -------------', PHP_EOL;

var_dump(array_filter($arr, function($v) {
    return $v == 4;
}, false));

var_dump(array_filter($arr, function($v, $k) {
    return $k == 'b' || $v == 4;
}, true));

/*var_dump(array_filter($arr, function($k) {
    return $k == 'b';
}, 2));*/

echo '===== WHEN ERRORS ARE ACTUALLY THROWN =====', PHP_EOL;

echo '------ $mode is invalid value -------------', PHP_EOL;

try {
    var_dump(array_filter($arr, function($v) {
        return $v == 4;
    }, 50));
} catch(Error $e) {
    echo $e->getMessage(), PHP_EOL;
}

echo '------ $mode is invalid value and invalid type -------------', PHP_EOL;

try {
    var_dump(array_filter($arr, function($v) {
        return $v == 4;
    }, 'text'));
} catch(Error $e) {
    echo $e->getMessage(), PHP_EOL;
}

Output for git.master, git.master_jit: 0 1 2 ===== THESE ARE VALID AND CORRECT ===== ------ $mode is PHP constant ------------- array(1) { ["d"]=> int(4) } array(2) { ["b"]=> int(2) ["d"]=> int(4) } array(1) { ["b"]=> int(2) } ------ $mode is integer ------------- array(1) { ["d"]=> int(4) } array(2) { ["b"]=> int(2) ["d"]=> int(4) } array(1) { ["b"]=> int(2) } ===== THE BEHAVIOUR HERE IS UNEXPECTED, I WOULD EXPECT A TYPEERROR ===== ------- $mode is text string ------------ array(1) { ["d"]=> int(4) } array(2) { ["b"]=> int(2) ["d"]=> int(4) } array(1) { ["b"]=> int(2) } ------ $mode is float ------------- Deprecated: Implicit conversion from float 0.2 to int loses precision in /in/aGq6E on line 58 array(1) { ["d"]=> int(4) } Deprecated: Implicit conversion from float 1.3 to int loses precision in /in/aGq6E on line 62 array(2) { ["b"]=> int(2) ["d"]=> int(4) } Deprecated: Implicit conversion from float 2.2 to int loses precision in /in/aGq6E on line 66 array(1) { ["b"]=> int(2) } ------ $mode is boolean ------------- array(1) { ["d"]=> int(4) } array(2) { ["b"]=> int(2) ["d"]=> int(4) } ===== WHEN ERRORS ARE ACTUALLY THROWN ===== ------ $mode is invalid value ------------- array_filter(): Argument #3 ($mode) must be one of ARRAY_FILTER_USE_VALUE, ARRAY_FILTER_USE_KEY, or ARRAY_FILTER_USE_BOTH ------ $mode is invalid value and invalid type ------------- array_filter(): Argument #3 ($mode) must be of type int, string given

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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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