3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = ", , GUWAHATI, TEZPUR, , BAMUNI HILLS, MAHABHAIRAB TEMPLE, AGNIGARH , "; echo preg_replace('/\s*(?:,\s*)+/', ', ', trim($string, ", \n\r\t\v\x00"));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
GUWAHATI, TEZPUR, BAMUNI HILLS, MAHABHAIRAB TEMPLE, AGNIGARH
preferences:
142.1 ms | 402 KiB | 123 Q