arrays - Run a function on all parts of string php -

i built function capture text between brackets , output them array. problem function executes first time in string.

function getbetween($content,$start,$end){      $r = explode($start, $content);       if (isset($r[1])){          $r = explode($end, $r[1]);          return $r[0];      }      return '';  }  function srthhcdf($string){     $innercode = getbetween($string, '[coupon]', '[/coupon]');     $iat = explode('&&', $innercode);     $string = str_replace('[coupon]','',$string);     $string = str_replace('[/coupon]','',$string);     $newtext = '<b>'.$iat[0].'</b> <i>'.$iat[1].'</i><b>'.$iat[2].'</b>';     $string = str_replace($innercode,$newtext,$string);     return $string; } $text = srthhcdf($text); 

but matches first [coupon] , [/coupon] not others. when string

hello world [coupon]hello && bad && world[/coupon] , [coupon] && bad && world [/coupon] 

it outputs

hello world <b>hello </b> <i> bad </i><b> world</b> , && bad && world. 

which means replaces [coupon] , [/coupon] every time doesn't formats text inside them every time.

check solution. problem is, replacing codes after first call, , there no loop:

function getbetween($content, $start, $end) {     $pieces = explode($start, $content);     $inners = array();     foreach ($pieces $piece) {         if (strpos($piece, $end) !== false) {             $r = explode($end, $piece);             $inners[] = $r[0];         }     }     return $inners; }  function srthhcdf($string) {     $innercodes = getbetween($string, '[coupon]', '[/coupon]');     $string = str_replace(array('[coupon]', '[/coupon]'), '', $string);     foreach ($innercodes $innercode) {         $iat = explode('&&', $innercode);         $newtext = '<b>' . $iat[0] . '</b> <i>' . $iat[1] . '</i><b>' . $iat[2] . '</b>';         $string = str_replace($innercode, $newtext, $string);     }     return $string; }  $teststring = "hello world [coupon]hello && bad && world[/coupon] , [coupon] && bad && world [/coupon]"; $text = srthhcdf($teststring); echo $text;