mb_strpos

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

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

Beschreibung

mb_strpos(
    string $haystack,
    string $needle,
    int $offset = 0,
    ?string $encoding = null
): int|false

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. A negative offset counts from the end of the string.
encoding: Der Parameter encoding legt die Zeichenkodierung fest. Wird er nicht übergeben, so wird die interne Zeichenkodierung genutzt.

Rückgabewerte

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

Changelog

Version	Beschreibung
8.0.0	`needle` akzeptiert nun eine leere Zeichenkette.
8.0.0	`encoding` ist nun nullable (akzeptiert den `null`-Wert).
7.1.0	Support for negative `offset`s has been added.

Siehe auch

mb_internal_encoding() - Set/Get internal character encoding
strpos() - Sucht die Position des ersten Vorkommens des Suchstrings in einem String

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User Contributed Notes 3 notes

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stestagg at talk21 dot com ¶

18 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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-3

stestagg at talk21 dot com ¶

18 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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-19

stestagg at talk21 dot com ¶

18 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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