utf8_char2byte

[jwaldek]

i've got some php errors on error_reporting E_ALL in function utf8_char2byte_pos($str,$pos)
this is my proposition of this function:

Code: Select all

if (!function_exists('utf8_char2byte_pos')) {
  function utf8_char2byte_pos($str,$pos)    {
    $n = 0;                // number of characters found
    $p = abs($pos);        // number of characters wanted
 
    if ($pos >= 0)    {
      $i = 0;
      $d = 1;
    } else {
      $i = strlen($str)-1;
      $d = -1;
    }
 
    for( ; isset($str{$i})&&strlen($str{$i}) && $n<$p; $i+=$d)    {
      $c = (int)ord($str{$i});
      if (!($c & 0x80))    // single-byte (0xxxxxx)
        $n++;
      elseif (($c & 0xC0) == 0xC0)    // multi-byte starting byte (11xxxxxx)
        $n++;
    }
    if (isset($str{$i})&&!strlen($str{$i}))    return false; // offset beyond string length
 
    if ($pos >= 0)    {
      // skip trailing multi-byte data bytes
         if(isset($str{$i})){
         while ((ord($str{$i}) & 0x80) && !(ord($str{$i}) & 0x40)) { $i++; }
         }
    } else {
      // correct offset
      $i++;
    }
 
    return $i;
  }
}

[phpfreechat]

Could you explain what did you changed ?

[jwaldek]

add isset($str{$i})
because php sometimes throw notices about Undefined variable/ table index "$str{$i}" on error_reporting(E_ALL)