What steps can be taken to troubleshoot and fix errors caused by server upgrades in PHP scripts?

When server upgrades cause errors in PHP scripts, the first step is to check for deprecated functions or features that may have been removed in the new version. Update the code to use current functions and syntax. Additionally, ensure that any required extensions or modules are installed and enabled on the server to support the script's functionality. 

// Check for deprecated functions or features
// Update code to use current functions and syntax
// Ensure required extensions or modules are installed and enabled

// Example of updating code to use current functions
// Old code: mysql_query("SELECT * FROM table");
// New code: mysqli_query($connection, "SELECT * FROM table");

Keywords

PHP server upgrades troubleshooting error fixing debugging

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