What potential pitfalls or mistakes could have led to the changes not working as expected?

One potential pitfall could be not thoroughly testing the changes before deploying them, leading to unforeseen issues arising in a live environment. To prevent this, it is essential to conduct thorough testing in a staging environment to catch any bugs or issues before rolling out the changes. 

// Example of conducting thorough testing in a staging environment before deploying changes

// Staging environment setup
define('ENVIRONMENT', 'staging');

// Code for testing the changes
// Run various test cases to ensure the changes work as expected
// Fix any bugs or issues found during testing

// Deploy changes to live environment only after successful testing in staging
if (all_tests_pass()) {
    deploy_changes();
} else {
    rollback_changes();
}

Keywords

syntax error incorrect variable assignment missing semicolon undefined function incorrect file path

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