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run code in 300+ PHP versions simultaneously
<?php error_reporting(~0); function foo(&$a) {} function bar() { return 1; } function &baz() { $a = 1; return $a; } foo(bar()); // STRICT foo(baz()); // Not strict
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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Notice: Only variables should be passed by reference in /in/5C5sR on line 8
Output for 5.1.1 - 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 - 5.6.40
Strict Standards: Only variables should be passed by reference in /in/5C5sR on line 8
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/5C5sR on line 9
Process exited with code 255.
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/5C5sR on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.4

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