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<?php $pattern="\( ( (?>[^()]+) | (?R) )* \)"; $str="(def a (x) (+ 1 x))(print (a 1))"; var_dump(preg_grep(pattern,str));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "pattern" in /in/juPI5:9 Stack trace: #0 {main} thrown in /in/juPI5 on line 9
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant pattern - assumed 'pattern' (this will throw an Error in a future version of PHP) in /in/juPI5 on line 9 Warning: Use of undefined constant str - assumed 'str' (this will throw an Error in a future version of PHP) in /in/juPI5 on line 9 Warning: preg_grep() expects parameter 2 to be array, string given in /in/juPI5 on line 9 NULL
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
Notice: Use of undefined constant pattern - assumed 'pattern' in /in/juPI5 on line 9 Notice: Use of undefined constant str - assumed 'str' in /in/juPI5 on line 9 Warning: preg_grep() expects parameter 2 to be array, string given in /in/juPI5 on line 9 NULL
Output for 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Notice: Use of undefined constant pattern - assumed 'pattern' in /in/juPI5 on line 9 Notice: Use of undefined constant str - assumed 'str' in /in/juPI5 on line 9 Warning: preg_grep(): Second argument to preg_grep() should be an array in /in/juPI5 on line 9 NULL
Output for 4.3.0 - 4.3.10
Notice: Use of undefined constant pattern - assumed 'pattern' in /in/juPI5 on line 9 Notice: Use of undefined constant str - assumed 'str' in /in/juPI5 on line 9 Warning: Second argument to preg_grep() should be an array in /in/juPI5 on line 9 NULL

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