php - Get everything between strings and replace with something else -

i trying between {code} tags $html string.

so far have written doesn't work expected, replacing first {code}

also work many code tags, haven't gotten far yet.

<?php      $html = <<< eot <p>lorem ipsum dolor sit amet, consectetur adipiscing elit.</p> <p>{code}my test code 1{/code}</p> <p>lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>  eot;  $startpos = strpos($html, '{code}'); $endpos = strpos($html, '{/code}'); if($startpos !== false && $endpos !== false){     $startpos += 6; # strlen('{code}')     $endpos += 7; # strlen('{/code}')      // code     $code = substr($html, $startpos, $endpos);      // remove code apart start {code}     $html = substr($html, $startpos-6, $endpos);      // replace new code     $new_code = 'test';     $html = str_replace('{code}', $new_code, $html); }  echo $html; 

result: - http://codepad.viper-7.com/t9sbbn

testmy test code 1{/code}

lorem ipsum dolor sit amet, consectetur adipiscing elit.

expected result

lorem ipsum dolor sit amet, consectetur adipiscing elit.

test

lorem ipsum dolor sit amet, consectetur adipiscing elit.

this works 1 {code}.

<?php  $html = <<< eot <p>lorem ipsum dolor sit amet, consectetur adipiscing elit.</p> <p>{code}my test code 1{/code}</p> <p>lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>  eot;  $startpos = strpos($html, '{code}'); $endpos = strpos($html, '{/code}');  if($startpos !== false && $endpos !== false){     $startpos += 6; # strlen('{code}')       // code     $code = substr($html, $startpos, $endpos-$startpos);       // replace new code     $new_code = 'test';     $html = str_replace('{code}'.$code.'{/code}', $new_code, $html); }  echo $html; 

multiple this:

<?php  $html = <<< eot <p>lorem ipsum dolor sit amet, consectetur adipiscing elit.</p> <p>{code}my test code 1{/code}</p> <p>lorem ipsum dolor sit amet, consectetur adipiscing elit.{code}hi{/code}</p>  eot;  $html = test($html);  echo $html;  function test($html){     do{         $startpos = strpos($html, '{code}');         $endpos = strpos($html, '{/code}');          if($startpos !== false && $endpos !== false){             $startpos += 6; # strlen('{code}')              // code             $code = substr($html, $startpos, $endpos-$startpos);              // replace new code             $new_code = 'test';             $html = str_replace('{code}'.$code.'{/code}', $new_code, $html);         }      }while($startpos !== false && $endpos !== false);       return $html; }