Reverse a string in php without using any string function

Solution:1

$string = 'zeeshan';
$reverse = '';
$i = 0;
while(!empty($string[$i])){ 
      $reverse = $string[$i].$reverse; 
      $i++;
}
echo $reverse;

Solution:2

$string = "ZEESHAN";

$j = 0;
while(!empty($string[$j])) {
   $j++;
}

for($i = ($j-1); $i >= 0; $i--) {
    echo $string[$i];
}

Solution:3

$string = "ZEESHAN";
$reverse = "";
$j = 0;
while(isset($string[$j])){
    $j++;
}

for($i = $j - 1; $i >= 0; $i--){
    $reverse .= $string[$i];
}
echo $reverse;