mb_strpos
(PHP 4 >= 4.0.6, PHP 5)
mb_strpos — Find position of first occurrence of string in a string
Description
$haystack
, string $needle
[, int $offset = 0
[, string $encoding = mb_internal_encoding()
]] )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.
Parameters
-
haystack -
The string being checked.
-
needle -
The string to find in
haystack. In contrast with strpos(), numeric values are not applied as the ordinal value of a character. -
offset -
The search offset. If it is not specified, 0 is used.
-
encoding -
The
encodingparameter is the character encoding. If it is omitted, the internal character encoding value will be used.
Return Values
Returns the numeric position of
the first occurrence of needle in the
haystack string. If
needle is not found, it returns FALSE.
See Also
- mb_internal_encoding() - Set/Get internal character encoding
- strpos() - Find the position of the first occurrence of a substring in a string
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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