<?php $checkerboard = [["r","n","b","q","k","b","n","r"],["p","p","p","p","p","p","p","p"],["1","1","1","1","1","1","1","1"],["1","1","1","1","1","1","1","1"],["1","1","1","1","P","1","1","1"],["1","1","1","1","1","1","1","1"],["P","P","P","P","1","P","P","P"],["R","N","B","Q","K","B","N","R"]]; $FEN = ""; for ($i = 0;$i < 8;$i++){ for ($j = 0;$j < 8;$j++){ if ($checkerboard[$i][$j] === "1"){ if (@$checkerboard[$i][$j + 1] === "1"){ /* How to iterate till the end */ $FEN .= (int)$checkerboard[$i][$j] + (int)$checkerboard[$i][$j+1]; } } else { $FEN .= $checkerboard[$i][$j]; } } $FEN .= "/"; } echo $FEN; // Output should be: // rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR
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