How to Fix Undefined Function \'oci_connect()\' Error in PHP?

Undefined Function 'oci_connect()' in PHP

When attempting to establish an Oracle database connection using the oci_connect() function, developers may encounter an error indicating that the function is undefined. This error typically occurs when the appropriate Oracle extensions are not installed or properly enabled.

In the provided code snippet, the oci_connect() function is called without any prior inclusion of the necessary extension. To resolve this issue and enable communication with the Oracle database, follow these steps:

1. Install Oracle Instant Client:

Download and install Oracle Instant Client from the official Oracle website. Ensure that the version of Instant Client is compatible with the Oracle database you are connecting to.

2. Enable Oracle Extension in PHP:

Edit the PHP configuration file (php.ini) and uncomment the following lines:

extension=oci8.dll
extension=php_oci8_11g.dll

3. Configure Apache Server:

Restart the Apache server to load the newly enabled Oracle extension.

4. Verify PHP Configuration:

Use the phpinfo() function to check if the Oracle extension has been successfully loaded:

<code class="php"><?php phpinfo();
?></code>

Look for the "Oracle" section in the output to confirm that the extension is enabled.

5. Troubleshooting Tips:

If you continue to encounter the "Call to undefined function oci_connect()" error, try the following troubleshooting measures:

• Ensure that the path to the Oracle Instant Client directory is included in the PHP configuration file.
• Double-check that the Oracle DLLs are located in the correct directory (usually ext/oci8).
• Reinstall the Oracle Instant Client and PHP extensions to rule out any potential corruption.

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