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run code in 300+ PHP versions simultaneously
<?php $s = "123, 123, 456, 456, 123, 123"; $arr = explode(",", $s); $str =""; Foreach(array_chunk($arr,2) as $sub){ $str .= trim(implode(",",$sub)) .",<br>\n"; } Echo $str;

preferences:
26.58 ms | 402 KiB | 5 Q