What potential issues or conflicts can arise when modifying a PHP navigation script for specific requirements?

Issue: One potential issue that can arise when modifying a PHP navigation script for specific requirements is compatibility with existing code. If the modifications are not implemented correctly, they can cause conflicts with other parts of the script or break its functionality. To solve this, it is important to thoroughly test the modified script and ensure that it works seamlessly with the rest of the code.

// Example code snippet for modifying a PHP navigation script

// Original navigation script
function generateNavigation() {
    // Code for generating navigation menu
}

// Modified navigation script for specific requirements
function generateCustomNavigation() {
    // Code for generating custom navigation menu
}

// Call the appropriate navigation function based on requirements
if ($specificRequirement) {
    generateCustomNavigation();
} else {
    generateNavigation();
}