3v4l.org

run code in 300+ PHP versions simultaneously
<?php function test(string $a = NULL) { var_dump($a); } test(NULL); test('a');
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Deprecated: test(): Implicitly marking parameter $a as nullable is deprecated, the explicit nullable type must be used instead in /in/7saY2 on line 3 NULL string(1) "a"
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
NULL string(1) "a"
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90.88 ms | 1242 KiB | 4 Q