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run code in 150+ php & hhvm versions
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<?php call_user_func(function(){ echo 'val_val' . PHP_EOL; $a = "xxx"; $b = $a; $c = $b; ob_start(function ($s) { return preg_replace('/^/m', " ", $s); }); xdebug_debug_zval('a', 'b', 'c'); ob_end_flush(); }); call_user_func(function(){ echo 'ref_val' . PHP_EOL; $a = "xxx"; $b = &$a; $c = $b; ob_start(function ($s) { return preg_replace('/^/m', " ", $s); }); xdebug_debug_zval('a', 'b', 'c'); ob_end_flush(); }); call_user_func(function(){ echo 'val_ref' . PHP_EOL; $a = "xxx"; $b = $a; $c = &$b; ob_start(function ($s) { return preg_replace('/^/m', " ", $s); }); xdebug_debug_zval('a', 'b', 'c'); ob_end_flush(); }); call_user_func(function(){ echo 'ref_ref' . PHP_EOL; $a = "xxx"; $b = &$a; $c = &$b; ob_start(function ($s) { return preg_replace('/^/m', " ", $s); }); xdebug_debug_zval('a', 'b', 'c'); ob_end_flush(); });
Output for 7.0.0 - 7.1.0
val_val Fatal error: Uncaught Error: Call to undefined function xdebug_debug_zval() in /in/ntMhs:10 Stack trace: #0 /in/ntMhs(12): {closure}() #1 {main} thrown in /in/ntMhs on line 10
Process exited with code 255.
Output for 5.3.0 - 5.6.28
val_val Fatal error: Call to undefined function xdebug_debug_zval() in /in/ntMhs on line 10
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/ntMhs on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/ntMhs on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/ntMhs on line 2
Process exited with code 255.