Question

How to extract only special characters from a string in PHP

Answer 1

function extract_only_special_characters($s) { 
    $len = strlen($s); 
    $special_characters = "";
          
    for ($i = 0; $i < $len; $i++) { 
         $ch = $s[$i]; 
         if (!ctype_alnum($ch) && $ch != ' ') {
            $special_characters = $special_characters . $ch; 
         }
    } 
    return $special_characters;
} 
  

$s = "c++14@vb.NET&%java*() php <>/python 3.7.3"; 

echo extract_only_special_characters($s);
     

 
   
/*
run:
        
++@.&%*()<>/..
 
*/

 

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