How to Troubleshoot the \"Call to Undefined Function oci_connect()\" Error in PHP?

Troubleshooting: "Call to undefined function oci_connect()""

This error, which occurs when the oci_connect() function is invoked, indicates that PHP is unable to locate the necessary Oracle extension. The oci_connect() function, used to establish a connection to an Oracle database, requires the Oracle Client SDK to be installed and configured properly.

The issue may arise for various reasons. One common cause is the PHP configuration not being updated after installing the Oracle Client SDK. To resolve this, ensure that the php.ini file contains the following line:

extension=oci8.so

Once the extension is enabled, restart your web server to activate the changes.

Another potential cause is the wrong version of the Oracle Client SDK. The PHP extension must correspond to the version of the Instant Client installed. If multiple versions are present, ensure that the correct version is being referenced.

Additionally, the error "PHP Warning: PHP Startup: in Unknown on line 0" often accompanies the "Call to undefined function oci_connect()" error. This warning suggests a configuration issue or a conflict between PHP modules. Try restarting the web server several times to see if the warning disappears.

If the aforementioned steps do not resolve the issue, consider these further troubleshooting measures:

• Verify that the Oracle Client SDK is installed in the correct directory.
• Check that the path to the Oracle libraries is added to the system's environment variables.
• Restart your computer to ensure that all changes take effect.

By following these guidelines, you can diagnose and address the "Call to undefined function oci_connect()" error effectively, enabling your applications to establish connections to Oracle databases without interruptions.

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