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run code in 200+ php & hhvm versions
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<?php @$undef; xdebug_debug_zval('undef'); @debug_zval_dump ( $undef ); $undef = "defined"; debug_zval_dump($undef);
based on LvrH0
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function xdebug_debug_zval() in /in/0OlPA:4 Stack trace: #0 {main} thrown in /in/0OlPA on line 4
Process exited with code 255.
Output for 5.0.0 - 5.6.28
Fatal error: Call to undefined function xdebug_debug_zval() in /in/0OlPA on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: xdebug_debug_zval() in /in/0OlPA on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: xdebug_debug_zval() in /in/0OlPA on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: xdebug_debug_zval() in /in/0OlPA on line 4