Solution to PHP Fatal error: Call to undefined function ldap_connect()

In PHP applications, it is very common to use LDAP (Lightweight Directory Access Protocol). However, sometimes you may receive the following error message:

PHP Fatal error: Call to undefined function ldap_connect()

This error message indicates that your version of PHP has not loaded or enabled LDAP Extension. This can easily result in users being unable to connect to the LDAP server and perform corresponding operations.

In this article, we will discuss how to resolve this error message.

1. Check whether the LDAP extension of PHP has been enabled

First, make sure that the LDAP extension has been enabled in your PHP environment. You can check this by:

Open a terminal and run the following command:

php -m | grep ldap

If you see the keyword "ldap" The output indicates that the LDAP extension has been enabled. If not, you need to enable it, the exact method will vary depending on the system and PHP version you are using.

2. Enable LDAP extension in php.ini file

If the LDAP extension is not enabled in your PHP environment, you can enable it by editing the php.ini file. In Linux systems, php.ini is generally located in the /etc/ directory, while in Windows systems, it is located in the PHP root directory.

Open the php.ini file and find the following line:

;extension=php_ldap.dll

Remove the semicolon in front and change the extension to the system you are using Corresponding extension:

extension=php_ldap.so (Linux)

extension=php_ldap.dll (Windows)

Save and close the file, then restart your Web server.

3. Restart the Web Server

If you have enabled the LDAP extension and it still does not work, try restarting your Web server.

In Linux systems, you can use the following command to restart Apache:

sudo service apache2 restart

In Windows systems, you can use the following commands to restart IIS:

iisreset

4. Check if the LDAP service is available

If the LDAP extension has been enabled and you have restarted the web server but still cannot connect to LDAP server, it may be because the LDAP service is unavailable.

You can try using the following command to check if the LDAP service is available:

telnet your-ldap-server-hostname 389

If the output is similar to the following, it means LDAP Service available:

Trying 10.0.2.15...

Connected to your-ldap-server-hostname.

Escape character is '^]'.

5. Check that the PHP code is correct

Finally, you need to make sure that your PHP code is correct. Check that the place in the PHP code where the ldap_connect() function is called is correct and make sure all parameters are correct. Before calling the function, you need to ensure that the LDAP extension is loaded and the LDAP service is available.

Summary

If you encounter the error message "Call to undefined function ldap_connect()", please follow the above steps to check one by one. First check whether the LDAP extension has been enabled, and then confirm whether the php.ini file has been configured correctly. Secondly, you need to restart the web server and check if the LDAP service is available. Finally, make sure your PHP code is correct. If you have followed the above steps to fix it, but the problem still exists, you can consider using other similar extensions or using the LDAP interface library.

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