<?php // PHP5.3: but must use array(); PHP5.4+ $start = '1,2,3\n,4,5,6,\n,7,8,9'; $it = [['k' =>',', 'v'=>''], ['k'=>'\n', 'v'=>"\n"]]; // aproximating tuple seq print array_reduce($it, function($s, $a){ return str_replace( $a['k'], $a['v'], $s ); }, $start);
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