3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A0 {}; class A1 extends A0 {}; $a = function ($a) : $A0 {return $a;}; $a(new A0());
Output for 7.0.0 - 7.0.2
Parse error: syntax error, unexpected '$A0' (T_VARIABLE) in /in/MWtTh on line 5
Process exited with code 255.
Output for 5.5.24 - 5.5.31, 5.6.8 - 5.6.17
Parse error: syntax error, unexpected ':', expecting '{' in /in/MWtTh on line 5
Process exited with code 255.
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