Question

How to extract uppercase characters (capital letters) from a string in PHP

Answer 1

function extract_uppercase($s) { 
    $len = strlen($s);
    $upper_s = ""; 
 
    for ($i = 0; $i < $len; $i++) { 
        if ($s[$i] >= 'A' && $s[$i] <= 'Z') {
            $upper_s = $upper_s . $s[$i];
        }
    } 
    return $upper_s; 
} 
 
  
$s = "pPHhpP"; // phpPHP

$uc = extract_uppercase($s);

echo $uc; 
  
 
         
  
/*
run:
              
PHP
       
*/

 

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