问题
I have a wordpress web site.
I've created simple page template like:
<?php
/**
* Template Name: Test
*/
echo strlen('Привет');
?>
Then i've created a page using this template. The page shows the length of russian string 'Привет' (means 'Hello'). I expect to see 12, as UTF-8 encoded russian string consisting of 6 characters should have a size of 12 bytes, but i get 6 instead.
I've tested the same thing on other server and had correct value - 12. So i think the reason is my server configuration. I have wp 3.2.1 (i had the same problem after upgrading to wp 3.5.1) and PHP 5.3.3.
Currently i've spent about 5 days trying to find a solution, but have no luck. Does anyone know what is the reason of such behavior?
回答1:
Check the mbstring.func_overload setting in php.ini. This option allows PHP to override the strlen() function with mb_strlen() (and similarly for other equivalents). This could explain the discrepancy between your servers
EDIT
Quoting from the doc link:
To use function overloading, set mbstring.func_overload in php.ini to a positive value that represents a combination of bitmasks specifying the categories of functions to be overloaded. It should be set to 1 to overload the mail() function. 2 for string functions, 4 for regular expression functions. For example, if it is set to 7, mail, strings and regular expression functions will be overloaded.
So a value with the 2 bit set means that basic string functions will be overloaded with their mbstring equivalent, but not mail or regular expression functions; if you want normal behaviour, this should be 0
回答2:
Have you tried: http://lt.php.net/manual/en/function.mb-strlen.php ?
int mb_strlen ( string $str [, string $encoding ] )
Gets the length of a string.
回答3:
Do you need to use multi-byte string functions for this? Such as http://www.php.net/manual/en/function.mb-strlen.php
回答4:
See http://php.net/manual/en/function.mb-strlen.php for more info about getting string length in multi-byte characters.
来源：https://stackoverflow.com/questions/15342402/php-strlen-returns-character-length-instead-of-byte-length