iconv_set_encoding
If iconv_strlen is passed a UTF-8 string containing badly formed sequences, it will return FALSE. This is in contrast to mb_strlen of the behaviour of utf8_decode, which strip out any bad sequences;
<?php
# UTF-8 string containing bad sequence: \xe9
$str = "Itrntin\xe9liztin";
print "mb_strlen: ".mb_strlen($str,'UTF-8')."\n";
print "strlen/utf8_decode: ".strlen(utf8_decode($str))."\n";
print "iconv_strlen: ".iconv_strlen($str,'UTF-8')."\n";
?>
Displays;
mb_strlen: 20
strlen/utf8_decode: 20
iconv_strlen:
(PHP 5.0.5)
As such it is being "stricter" than mb_strlen and it may mean you need to check for invalid sequences first. A quick way to check is to exploit the behaviour of the PCRE extension (see notes on pattern modifiers);
<?php
if (preg_match('/^.{1}/us',$str,$ar) != 1) {
die("string contains invalid UTF-8");
}
?>
A slower but stricter check (regex) can be found at: http://www.w3.org/International/questions/qa-forms-utf-8
Similiar applies to iconv_substr, iconv_strpos and iconv_strrpos
iconv_strlen
(PHP 5)
iconv_strlen — Возвращает количество символов в строке
Описание
int iconv_strlen
( string $str
[, string $charset
] )
Возвращает количество символов в str .
В отличие от strlen(), iconv_strlen() учитывает кодировку строки (например, юникод может быть и двух-, и четырёхбайтным).
Если параметр charset опущен, предполагается, что кодировка строки str равна iconv.internal_charset.
См. также strlen() и mb_strlen().
add a note
User Contributed Notesiconv_strlen
hfuecks @ nospam org
24-Feb-2006 04:58
24-Feb-2006 04:58