PHP Unconference Europe 2015

mb_strpos

(PHP 4 >= 4.0.6, PHP 5)

mb_strposFind position of first occurrence of string in a string

Beschreibung

int mb_strpos ( string $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.

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 ├╝bergeben so wird das interne Zeichenencoding genutzt.

R├╝ckgabewerte

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

Siehe auch

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User Contributed Notes 3 notes

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1
stestagg at talk21 dot com
8 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)
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1
stestagg at talk21 dot com
8 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 $haystack;
}
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-3
stestagg at talk21 dot com
8 years ago
sorry, my previous post had an error.  replace the 1000 with strlen($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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