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<?php class Foo { function fun() { echo "fooo"; } } $parts = ['Foo', 'fun']; (new array_shift($parts))->array_shift($parts)();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Class "array_shift" not found in /in/3UCd8:11 Stack trace: #0 {main} thrown in /in/3UCd8 on line 11
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Class 'array_shift' not found in /in/3UCd8:11 Stack trace: #0 {main} thrown in /in/3UCd8 on line 11
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '(' in /in/3UCd8 on line 11
Process exited with code 255.

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