Online PHP editor | output for qGp6P

<?php $matrix = [ [11, 12, 13, 14, 15], [21, 22, 23, 24, 25], [31, 32, 33, 34, 35], [41, 42, 43, 44, 45], [51, 52, 53, 54, 55] ]; echo "До:\n"; foreach($matrix as $_) { foreach($_ as $item) echo $item . ' '; echo PHP_EOL; } echo "\n"; for ($i = 0; $i < count($matrix); $i++) { for ($j = $i + 1; $j < count($matrix); $j++) { $temp = $matrix[$i][$j]; $matrix[$i][$j] = $matrix[$j][$i]; $matrix[$j][$i] = $temp; } } echo "После:\n"; foreach($matrix as $innerArray){ foreach($innerArray as $item){ echo $item . ' '; } echo PHP_EOL; }