asd

$arr = array();
$arr = array_fill(0, $size, array());

for ($i = 0; $i < count($arr); $i++) {
    $arr[$i] = array_fill(0, $size, '|');
}


$str = 'Rvioes roi tset ';
$index = 0;
$row = 0;
$col = 0;

while ($index < $size * $size) {
    while ($arr[$row][$col] == '|' && $col < $size) {
        $arr[$row][$col++] = $str[$index++ % strlen($str)];
    }
    $row += 1;
    $col -= 1;
    while ($arr[$row][$col] == '|' && $row < $size) {
        $arr[$row++][$col] = $str[$index++ % strlen($str)];
    }
    $row -= 1;
    $col -= 1;
    while ($arr[$row][$col] == '|' && $col >= 0) {
        $arr[$row][$col--] = $str[$index++ % strlen($str)];
    }
    $row -= 1;
    $col += 1;
    while ($arr[$row][$col] == '|' && $col >= 0) {
        $arr[$row--][$col] = $str[$index++ % strlen($str)];
    }
    $row += 1;
    $col += 1;
}