What should I do if php cannot load the dynamic library?

Solution to the problem that php cannot load the dynamic library: 1. Copy "libmySQL.dll" in the PHP integration package to the system32 directory; 2. Add the PHP decompression directory to PATH; 3. In Apache's configuration file uses loadfile to load some dynamic link libraries.

php failed to load dynamic library

PHP’s integration package comes with a lot of dynamic link libraries, but when we After configuring according to the instructions, I ran phpinfo() and found that many templates were not loaded. Although we have removed the comment (;) in front of the corresponding link library in php.ini.

I discovered a very interesting thing when configuring WAMP: sometimes the mysql module can be loaded, and sometimes it cannot be loaded. After careful study, I found that when mysql can be loaded, it uses installation files, and when it cannot be loaded, mysql uses mostly compressed packages. What is the difference between the two cities?

The difference is that during the installation of the installation package, you can choose to add the mysql installation directory (./MySQL*.*/bin) to the PATH.

What effect will this have? It turns out that there is a file in this directory with the same name as the PHP integration package - libmySQL.dll.

Searching the Internet, I found that there are other solutions:

Copy libmySQL.dll in the PHP integration package to the system32 directory - this directory is usually in the PATH;

Another way that does not require changing PATH is to add a sentence to the Apache configuration file: [loadfile X:/*/libmySQL.dll] uses an absolute path.

The root of the problem seems to have been found. Can other modules also solve it in this way?

The answer is yes, yes.

The easiest way is to add the PHP decompression directory (usually including libmysql.dll, php.exe, etc.) to PATH;

Then restart the system - just restarting apache will not work , when you check the PATH parameter of "Apache Environment" in phpinfo(), you will find that the "PATH" item has not changed at all. If you can change the application without restarting the system, I don't know yet. Who knows, please tell me.

Another way to avoid changing PATH and restarting the system is to use loadfile in the Apache configuration file to load some dynamic link libraries.

After testing, I have listed the modules I know and the dynamic link libraries to be loaded:

　　PHP模块　　　　　　运行时要加载的动态链接库
　　------------------------------------------------------------
　　php_fdf.dll                ->fdftk.dll
　　php_interbase.dll      ->gds32.dll
　　php_pdo_firebird.dll ->gds32.dll
　　php_curl.dll               ->ssleay32.dll
　　php_ldap.dll             ->ssleay32.dll
　　php_openssl.dll        ->ssleay32.dll
　　php_mcrypt.dll         ->libmcrypt.dll
　　php_mhash.dll         ->libmhash.dll
　　php_msql.dll           ->msql.dll
　　php_mssql.dll           ->ntwdblib.dll
　　php_pdo_mssql.dll   ->ntwdblib.dll
　　php_mysql.dll           ->libmysql.dll
　　php_mysqli.dll          ->libmysql.dll
　　php_pdo_mysql.dll   ->libmysql.dll

The dynamic link libraries to be loaded are all located in the integrated package decompression directory of PHP (usually Including libmysql.dll, php.exe, etc.). There are also three files in this directory: fribidi.dll, libeay32.dll and libswish-e.dll. I don't know what they are used for yet. As for the name and function of each module, I won't go into details.

Recommended: "PHP Tutorial"

Note: This method is suitable for php5.1.X, php5.2.X series, php.4X has not been tested.

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