Question

How to reverse the middle N characters of a string in PHP

Answer 1

function reverse_middle($s, $pos) { 
    $len = strlen($s);
    $mid = (int)(($len - $pos) / 2); 
    $tmp = "";
 
    for ($i = 0; $i < $mid; $i++) {
        $tmp .= $s[$i]; 
    }
   
    for ($i = $mid + $pos - 1; $i >= $mid; $i--) {
        $tmp .= $s[$i]; 
    }
   
    for ($i = $mid + $pos; $i < $len; $i++) {
         $tmp .= $s[$i];
    }
     
    return $tmp;
} 
   

$s = "abcdefg"; 
$pos = 3; 
     
echo reverse_middle($s, $pos); 


 
   
/*
run:
        
abedcfg
 
*/

 

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