PHP：调用未定义的函数mb_strlen（） - 在启用了mbstring的自定义编译的PHP上

I have this custom compiled PHP (v5.3.3) with the following extensions enabled (via configure):

./configure 
--prefix=/usr/local/php5.3.3 
--with-config-file-path=/usr/local/apache2/conf 
--with-apxs2=/usr/local/apache2/bin/apxs 
--with-bz2 
--with-curl=/usr/lib 
--with-curlwrappers 
--with-freetype-dir=/usr/local 
--with-gd=/usr/local 
--with-gettext 
--with-gmp 
--with-iconv=/usr/local 
--with-imap=/usr/local/imap2007e 
--with-imap-ssl 
--with-jpeg-dir=/usr/local/lib 
--with-kerberos 
--with-libxml-dir=/usr/lib 
--with-mcrypt=/usr/local 
--with-mhash 
--with-mysql=/usr/lib/mysql 
--with-mysql-sock=/var/lib/mysql/mysql.sock 
--with-mysqli=/usr/lib/mysql/mysql_config 
--with-openssl=/usr 
--with-pcre-dir=/usr/local/lib 
--with-pear 
--with-png-dir=/usr/local/lib 
--with-readline 
--with-sqlite 
--with-xmlrpc 
--with-xsl=/usr/local 
--with-zlib-dir=/usr/local/lib 
--with-zlib=/usr/local 
--without-pgsql 
--enable-bcmath 
--enable-calendar 
--enable-exif 
--enable-embedded-mysqli=shared 
--enable-ftp 
--enable-gd-jis-conv 
--enable-gd-native-ttf 
--enable-mbstring=all 
--enable-mbregex 
--enable-shared 
--enable-sockets 
--enable-soap 
--enable-sqlite-utf8 
--enable-zend-multibyte 
--enable-zip 
--disable-pdo 
--disable-phar

phpinfo() clearly states that mbstring is enabled: alt text

Funny thing is when I try to run some PHP scripts (SugarCRM updates), it reports the following error:

PHP Fatal error: Call to undefined function mb_strlen() in crm/include/pclzip/pclzip.lib.php on line 4165

Can anyone throw some light into WHY this is happening and how to fix this?

Thanks, m^e

Put this phpinfo() in a some php file for the output. And look for MbString seperate box there, if it is not present, then it is not installed properly.

For PHP 4.3.3 or before, To enable that feature, you will have to supply either one of the following options to the LANG parameter of --enable-mbstring=LANG ; --enable-mbstring=cn for Simplified Chinese support, --enable-mbstring=tw for Traditional Chinese support, --enable-mbstring=kr for Korean support, --enable-mbstring=ru for Russian support, and --enable-mbstring=ja for Japanese support (default). To enable all supported encoding, use --enable-mbstring=all

try

  • configure again with --enable-mbstring only

  • grep mb_strlen $PATH_TO_YOUR_PHP_BINARY to see is it exist

Simple solution.

Instead mb_strlen() only use strlen().

To me, it worked a few times.

On my Windows system with PHP and Apache, I had to modify the PHP.INI file so that it includes the following line:

extension=php_mbstring.dll

(inside the main [PHP] section) and restart Apache. After that, the call to mb_strlen did succeed.

I had the same problem, this is an issue with php version.

first run

sudo apt install php-mbstring

to install mbstring to the latest installed version of php

then run:

 sudo apt-get dist-upgrade

and restart apache with

 sudo /etc/init.d/apache2 restart

Good luck