How can one check for available modules, functions, and extensions in PHP to troubleshoot errors like undefined functions?

When encountering errors like undefined functions in PHP, it is essential to check if the necessary modules, functions, or extensions are available and properly loaded. To troubleshoot this issue, you can use the phpinfo() function to display detailed information about the PHP environment, including loaded modules and extensions. This information can help identify missing dependencies or configuration issues causing the undefined function errors. 

<?php
// Display PHP information to check for available modules and extensions
phpinfo();
?>

Keywords

PHP modules functions extensions troubleshooting undefined functions

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