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<?php $string="{1},[2],(3),<4>"; // Replaces closing square, curly, angle brackets with round brackets $string = preg_replace('/[{[<]/', '(', $string); $string = preg_replace('/[}>\]]/', ')', $string); echo $string;
Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
(1),(2),(3),(4)

preferences:
49.8 ms | 407 KiB | 5 Q