Online PHP editor | refs for ntMhs

<?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(); });