3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace MagicSerialization; class Ok { /** @return array<mixed> */ public function __serialize(): array { return []; } /** @param array<mixed> $data */ public function __unserialize(array $data): void { } } class WrongSignature { public function __serialize(): string { return ''; } public function __unserialize(string $data): string { return ''; } }
Output for 8.0.0 - 8.0.28, 8.1.0 - 8.1.18, 8.2.0 - 8.2.5
Fatal error: MagicSerialization\WrongSignature::__serialize(): Return type must be array when declared in /in/bLjLG on line 21
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/bLjLG on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/bLjLG on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/bLjLG on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/bLjLG on line 3
Process exited with code 255.
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210.3 ms | 1014 KiB | 7 Q