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

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

In PHP development, sometimes you will encounter the error PHP Fatal error: Call to undefined function pg_result(). This is because there is no Caused by correctly installing or enabling the PostgreSQL extension. This article explains how to resolve this issue.

1. Check whether the PostgreSQL extension has been installed correctly

To check whether the PostgreSQL extension has been installed correctly, you can follow the following steps:

1. Open the php.ini file

Find the following line in the php.ini file (if not, add it):

extension=php_pgsql.dll
extension=php_pdo_pgsql.dll

These lines can be found at the end of the file or in the extension section.

2. Confirm PHP version

Make sure that the PHP version used supports PostgreSQL extensions. The latest PHP versions support PostgreSQL extensions.

3. Restart the Web server

After modifying the php.ini file, you need to restart the Web server for the changes to take effect.

4. Check whether the PHP environment is correctly configured

Use the phpinfo() function to check whether the PHP environment is correctly configured. You should see the "pgsql" and "PDO PostgreSQL" extensions in the returned information. If these extensions are not listed, they will need to be reinstalled.

2. Reinstall the PostgreSQL extension

If you confirm that the PostgreSQL extension has been installed correctly but this error still occurs, you need to reinstall the extension.

The steps are as follows:

1. Download the PostgreSQL extension

You can download the PostgreSQL extension from the PECL website. PECL is the abbreviation of PHP Extension Community Library, which is a repository for PHP extensions.

2. Extract the downloaded file

Extract the downloaded file to your local computer.

3. Compile and install the extension

Compile and install the extension using the following command:

$ phpize
$ ./configure
$ sudo make && make install

Note: Depending on the operating system and PHP version, you may need to use different commands.

4. Modify the php.ini file

Add the following lines to the php.ini file:

extension=pgsql.so
extension= pdo_pgsql.so

5. Restart the web server

Restart the web server for the changes to take effect.

3. Summary

PHP Fatal error: Call to undefined function pg_result() error is usually caused by the PostgreSQL extension not being installed or enabled correctly. Check that the extension has been installed correctly and use the phpinfo() function to check that the PHP environment is configured correctly. If you need to reinstall the extension, follow the steps above.

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