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mb_strrchr> <mb_strlen
[edit] Last updated: Fri, 07 Jun 2013

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mb_strpos

(PHP 4 >= 4.0.6, PHP 5)

mb_strposBusca la posición de la primera ocurrencia de un string en otro string

Descripción

int mb_strpos ( string $haystack , string $needle [, int $offset = 0 [, string $encoding ]] )

Busca la posición de la primera ocurrencia de un string en otro string.

Realiza una operación strpos() segura multibyte basada en el número de caracteres. La posición del primer carácter es 0, la posición del segundo carácter es 1, etc.

Parámetros

haystack

El string a comprobar.

needle

El string a buscar en haystack. A diferencia de strpos(), los valores numéricos no se aplican como el valor ordinal de un carácter.

offset

El índice de búsqueda. Si no se especifica se usará 0.

encoding

El parámetro encoding es la codificación de caracteres. Si es omitido, será usado el valor de la codificación de caracteres interna.

Valores devueltos

Devuelve la posición numéricia de la primera ocurrencia de needle en el string haystack. Si no se encuentra needle, devuelve FALSE.

Ver también

  • mb_internal_encoding() - Establece/obtiene la codificación de caracteres interna
  • strpos() - Encuentra la posición de la primera ocurrencia de un substring en un string



mb_strrchr> <mb_strlen
[edit] Last updated: Fri, 07 Jun 2013
 
add a note add a note User Contributed Notes mb_strpos - [5 notes]
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0
brendel at krumedia dot de
5 years ago
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
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0
stestagg at talk21 dot com
6 years ago
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
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0
stestagg at talk21 dot com
6 years ago
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;
}
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0
stestagg at talk21 dot com
6 years ago
It appears that the $offset value is a character count not a byte count.  (This may seem obvious but it isn't explicitly stated)
up
-1
zangaru at hotmail dot com
5 years ago
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
}

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

 
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