Question

How to reverse string without temporary variable in PHP

Answer 1

function ReverseStringWithoutTemporaryVariable($str) {
    $start = 0;
    $end = strlen($str) - 1;
    $array = str_split($str);

    while ($start < $end) {
        $array[$start] ^= $array[$end]; // XOR used to swap two variables
        $array[$end] ^= $array[$start];
        $array[$start] ^= $array[$end];
        $end--;
        $start++;
    }
    return implode("", $array);
}

$str = "c++ php java c";

$str = ReverseStringWithoutTemporaryVariable($str);

echo $str;




/*
run:

c avaj php ++c

*/

 

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