It appears that the $offset value is a character count not a byte count. (This may seem obvious but it isn't explicitly stated)
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
Descrição
mb_strpos
( string
$haystack
, string $needle
, int $offset = 0
, string|null $encoding = null
) : int|falseFinds position of the first occurrence of a string in a string.
Performs a multi-byte safe strpos() operation based on number of characters. The first character's position is 0, the second character position is 1, and so on.
Parâmetros
-
haystack -
The string being checked.
-
needle -
The string to find in
haystack. In contrast with strpos(), numeric values are not applied as the ordinal value of a character. -
offset -
The search offset. If it is not specified, 0 is used. A negative offset counts from the end of the string.
-
encoding -
O parâmetro
encodingé a codificação de caractere. Se ele é omitido, o valor da codificação de caractere interna é usado.
Valor Retornado
Returns the numeric position of
the first occurrence of needle in the
haystack string. If
needle is not found, it returns false.
Changelog
| Versão | Descrição |
|---|---|
| 8.0.0 |
encoding is nullable now.
|
| 7.1.0 |
Support for negative offsets has been added.
|
Veja Também
- mb_internal_encoding() - Set/Get internal character encoding
- strpos() - Encontra a posição da primeira ocorrência de uma string
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User Contributed Notes 3 notes
stestagg at talk21 dot com ¶
17 years ago
stestagg at talk21 dot com ¶
17 years ago
a sample mb_str_replace function:
function mb_str_replace($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 $haystack;
}
stestagg at talk21 dot com ¶
17 years ago
sorry, my previous post had an error. replace the 1000 with strlen($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
