iconv_strlen()

(PHP 5, PHP 7)

返回字符串的字符数统计

说明

和 strlen() 不同的是，iconv_strlen() 统计了给定的字节序列$str中出现字符数的统计，基于指定的字符集，其产生的结果不一定和字符字节数相等。

参数

该字符串。

如果省略了$charset参数，假设$str的编码为 iconv.internal_encoding。

返回值

返回$str字符数的统计，是整型。

参见

• grapheme_strlen()Get string length in grapheme units
• mb_strlen()获取字符串的长度
• strlen()获取字符串长度

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;

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);

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

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