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run code in 150+ php & hhvm versions
Bugs & Features
<?php function test($string) { $string = 'bar'; } $a = 'foo'; test(&$a); print_r(error_get_last());
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.15
Fatal error: Call-time pass-by-reference has been removed; If you would like to pass argument by reference, modify the declaration of test(). in /in/NPRg6 on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Deprecated: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of test(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file in /in/NPRg6 on line 7 Array ( [type] => 8192 [message] => Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of test(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file [file] => /in/NPRg6 [line] => 7 )