Here are a few title options, depending on the emphasis you want to place: Focus on the specific error: * Why Am I Getting a \"PHP Fatal Error: Call to Undefined Function json_decode\" Des

PHP Fatal Error: Call to Undefined Function json_decode

This error typically occurs when the JSON extension is not installed or enabled for PHP. However, in this case, the php --version output indicates that PHP 5.5.1 is installed, which includes the JSON extension.

Ubuntu Issue

If you're using Ubuntu, the problem might stem from a license conflict with the JSON extension. Debian has removed this extension in PHP 5.5rc2 and replaced it with a functionally equivalent alternative.

To resolve this issue, install the php7.2-json package (or php7.1-json or php5-json for other PHP versions):

sudo apt-get install php7.2-json

Restart Apache:

sudo service apache2 restart

Other Troubleshooting Steps

If you're not using Ubuntu or the above steps don't solve the issue, consider the following:

• Verify that the JSON extension is enabled in your PHP configuration (e.g., php.ini).
• Check if any additional JSON-related dependencies are missing.
• Consult the PHP documentation for the json_decode() function and its dependencies.
• Recompile PHP with the JSON extension enabled.
• Ensure that the PHP script is executing the correct version of PHP (e.g., by using which php to check the executable path).

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