mb_strpos
(PHP 4 >= 4.0.6, PHP 5)
mb_strpos — Find position of first occurrence of string in a string
Описание
Finds position of the first occurrence of a string in a string.
Performs a multi-byte safe strpos() operation based on number of characters. The first character's position is 0, the second character position is 1, and so on.
Список параметров
- haystack
-
The string being checked.
- needle
-
The position counted from the beginning of haystack .
- offset
-
The search offset. If it is not specified, 0 is used.
- encoding
-
The encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.
Возвращаемые значения
Returns the numeric position of the first occurrence of needle in the haystack string. If needle is not found, it returns FALSE.
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Коментарии
It appears that the $offset value is a character count not a byte count. (This may seem obvious but it isn't explicitly stated)a sample mb_str_replace function:
function mb_str_replace($haystack, $search,$replace, $offset=0,$encoding='auto'){
$len_sch=mb_strlen($search,$encoding);
$len_rep=mb_strlen($replace,$encoding);
while (($offset=mb_strpos($haystack,$search,$offset,$encoding))!==false){
$haystack=mb_substr($haystack,0,$offset,$encoding)
.$replace
.mb_substr($haystack,$offset+$len_sch,1000,$encoding);
$offset=$offset+$len_rep;
if ($offset>mb_strlen($haystack,$encoding))break;
}
return $haystack;
}
sorry, my previous post had an error. replace the 1000 with strlen($haystack) to handle strings longer than 1000 chars.
btw. This is an issue with the mbstring functions. you can't specify the $encoding without specifying a $length, thus this reduces the functionality of mb_substr compared to substr