Question

How to convert a character inside string to lowercase in PHP

Answer 1

function char_to_lowercase(&$s, $idx) { 
    if ($idx < 0 || $idx > strlen($s)) {
        return;
    }
  
    for ($i = 0; $i < strlen($s); $i++) {
         if ($i == $idx) {
             $s[$i] = strtolower($s[$i]);
         }
    }
}
  
$s = "PHP PROGRAMMING";
 
char_to_lowercase($s, 0);
echo $s . "<br />";
 
char_to_lowercase($s, 5);
echo $s; 
   
  
          
   
/*
run:
               
pHP PROGRAMMING
pHP PrOGRAMMING
        
*/

 

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