mb_strpos

(PHP 4 >= 4.0.6, PHP 5)

mb_strpos — Find position of first occurrence of string in a string

Beschreibung

int mb_strpos ( string $haystack , string $needle [, int $offset = 0 [, string $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.

Parameter-Liste

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: Der encoding Parameter legt das Zeichenencoding fest. Wird er nicht übergeben so wird das interne Zeichenencoding genutzt.

Rückgabewerte

Returns the numeric position of the first occurrence of needle in the haystack string. If needle is not found, it returns FALSE.

Siehe auch

mb_internal_encoding() - Set/Get internal character encoding
strpos() - Sucht das erste Vorkommen des Suchstrings

mb_strrchr

mb_strlen

[edit] Last updated: Sat, 07 Jan 2012

add a note User Contributed Notes mb_strpos

brendel at krumedia dot de 10-Mar-2008 10:42


mb_strpos() used in a loop on a long string may become very slow even if you provide the $offset. Unlike strpos(), mb_strpos() has to skip the number of characters

 every call specified by $offset to get the real byte position used internally. (Whereas strpos can just add the offset.)



If your encoding is UTF-8 and you try to find only single characters with ordinal <= 127 you may still use strpos(), substr(), ... This works cause every byte of a UTF-8 sequence is >= 128.



Greetz maz

zangaru at hotmail dot com 05-Jul-2007 04:42


Hello,



Just replaced strpos() with mb_strpos() and now I am getting following error:



PHP Warning:  mb_strpos() [<a href='function.mb-strpos'>function.mb-strpos</a>]: Empty delimiter



PHP version: 5.2.3

OS: Win XP Prof

Web Server: IIS



I checked your bugs and mentioned that mb_string functions have been fixed as of 5.2.0 but it does not seem to be the case (Bug #39400).



My code:

==============================================



$charOut = mb_substr($tmpStr, $tmpKey[0], 1); 

$posOut = mb_strpos($charList, $charOut); 

if ($posOut !== FALSE) {

    // do something here

}



==============================================

stestagg at talk21 dot com 05-Aug-2006 11:12


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

stestagg at talk21 dot com 04-Aug-2006 03:42


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;

}

stestagg at talk21 dot com 04-Aug-2006 03:39


It appears that the $offset value is a character count not a byte count.  (This may seem obvious but it isn't explicitly stated)

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