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<?php $string = 'john1,steven2,lex66,e1esa2,444e3'; var_dump(array_chunk(explode(',', $string), 2));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> array(2) { [0]=> string(5) "john1" [1]=> string(7) "steven2" } [1]=> array(2) { [0]=> string(5) "lex66" [1]=> string(6) "e1esa2" } [2]=> array(1) { [0]=> string(5) "444e3" } }