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run code in 300+ PHP versions simultaneously
<?php class X { private function z($matches) { var_dump($matches); } public function y($template) { preg_replace_callback('//', [$this, 'z'], $template); } } $x = new X(); $x->y('bla bla [[ hey there ]] dasfasdf werwr');
Output for 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" } array(1) { [0]=> string(0) "" }

preferences:
190.17 ms | 406 KiB | 227 Q