PHP 5.6.0 released

iconv_strlen

(PHP 5)

iconv_strlenReturns the character count of string

Descrizione

int iconv_strlen ( string $str [, string $charset = ini_get("iconv.internal_encoding") ] )

In contrast to strlen(), iconv_strlen() counts the occurrences of characters in the given byte sequence str on the basis of the specified character set, the result of which is not necessarily identical to the length of the string in byte.

Elenco dei parametri

str

The string.

charset

If charset parameter is omitted, str is assumed to be encoded in iconv.internal_encoding.

Valori restituiti

Returns the character count of str, as an integer.

Vedere anche:

add a note add a note

User Contributed Notes 1 note

up
2
hfuecks @ nospam org
8 years ago
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
To Top