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run code in 300+ PHP versions simultaneously

@ 2018-01-11T13:39:38Z

<?php

$action = $_POST['action'] ?? 'default';

echo "Null coalesce with undefined variable: ";
var_dump($action);

if (isset($_POST['action'])) {
    $action = $_POST['action'];
} else {
    $action = 'default';
}

echo "If with undefined variable:            ";
var_dump($action);
echo "\n";

// -----------------------------------------

$_POST['action'] = 'value';

$action = $_POST['action'] ?? 'default';

echo "Null coalesce with value:              ";
var_dump($action);

$_POST['action'] = 'value';

if (isset($_POST['action'])) {
    $action = $_POST['action'];
} else {
    $action = 'default';
}

echo "If with value:                         ";
var_dump($action);
echo "\n";

// -----------------------------------------

$_POST['action'] = null;

$action = $_POST['action'] ?? 'default';

echo "Null coalesce with explicit NULL:      ";
var_dump($action);

// -----------------------------------------

$_POST['action'] = null;

if (isset($_POST['action'])) {
    $action = $_POST['action'];
} else {
    $action = 'default';
}

echo "If with explicit NULL:                 ";
var_dump($action);

Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Null coalesce with undefined variable: string(7) "default" If with undefined variable: string(7) "default" Null coalesce with value: string(5) "value" If with value: string(5) "value" Null coalesce with explicit NULL: string(7) "default" If with explicit NULL: string(7) "default"
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Null coalesce with undefined variable: string(7) "default" If with undefined variable: string(7) "default" Null coalesce with value: string(5) "value" If with value: string(5) "value" Null coalesce with explicit NULL: string(7) "default" If with explicit NULL: string(7) "default"

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162.36 ms | 402 KiB | 156 Q