PHP function of the position of the search string package

/ * * 
 * Find a positive number occurrence of the string n times 
 * @param $ str 
 * @param $ the Find 
 * @param $ n 
 * @return BOOL | int 
 * / 
function str_n_pos ( $ str , $ the Find , $ n = 1 ) 
{ 
    $ pos_val = 0 ;
     for ( $ I =. 1; $ I <= $ n- ; $ I ++ ) {
         $ POS = the strpos ( $ STR , $ Find );
         $ STR = substr ( $ STR , $ POS. 1 + );
         $ pos_val = $ POS + $ pos_val +. 1 ; 
    } 
    return  $ pos_val -. 1 ; 
} 

/ * * 
 * find the inverse number of occurrences of the string n 
 * @param STR $ 
 * @param Find $ 
 * $ @param n- 
 * @return BOOL | int 
 * / 
function str_n_rpos ( $ STR , $ Find , $ n- =. 1 ) 
{ 
    $ pos_val = 0 ;
     for ( $ I =. 1; $ I <= $ n- ; $ I ++) {
        $pos = strrpos($str, $find);
        $str = substr($str, 0, $pos);
        $pos_val = $pos;
    }
    return $pos_val;
}