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run code in 300+ PHP versions simultaneously
<?php class ParentClass implements Countable { public function count(): int { } } class Child extends ParentClass { public function count(): string // it's ok when class implements Countable { } }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Fatal error: Declaration of Child::count(): string must be compatible with ParentClass::count(): int in /in/lUUH6 on line 14
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Fatal error: Declaration of Child::count(): string must be compatible with ParentClass::count(): int in /in/lUUH6 on line 12
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/lUUH6 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected ':', expecting '{' or ';' in /in/lUUH6 on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/lUUH6 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
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/lUUH6 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/lUUH6 on line 3
Process exited with code 255.
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