文本替换中的问题

Question

I am trying to make a text replacer but since there are letters repeated i keep getting things i dont want. Does anyone know how i can do this?

Input

function image($img) { 
      $img = ereg_replace("a","<img src=r/a.png>", $img); 
      $img = ereg_replace("b","<img src=r/b.png>", $img); 
      $img = ereg_replace("c","<img src=r/c.png>", $img); 
      return $img; 
} 

 $img = "abc"; 
 echo image($img); 

Output

<img sr<img src=r/c.png>=r/a.png><img sr<img src=r/c.png>=r/b.png><img src=r/c.png> 

Output I Want

<img src=r/a.png><img src=r/b.png><img src=r/c.png> 

Answer 1

Try this, may be insufficient but it will satisfy your requirement:

function image($img) {
      $data=""; 

      for( $i = 0; $i <= strlen($img); $i++ ) {
        $char =substr( $img, $i, 1 );
        switch($char)
        {
            case 'a':
                 $data .="<img src=r/a.png>";
                 break;
            case 'b':
                 $data .="<img src=r/b.png>";
                 break;
            case 'c':
                 $data .="<img src=r/c.png>";
                 break;
            default:
            break;
        }
      }
      return $data; 
} 

 $img = "abc"; 
 echo image($img);