How can the use of str_replace() for modifying links in PHP lead to issues with link integrity and functionality?

Using str_replace() to modify links in PHP can lead to issues with link integrity and functionality because it replaces all occurrences of a substring without considering the context. This can result in unintended changes to other parts of the link or even breaking the link altogether. To solve this issue, it's better to use a more precise method like regular expressions to target specific parts of the link for modification.

// Example of using regular expressions to modify links in PHP
$link = 'https://www.example.com/page?id=123';
$newLink = preg_replace('/(https:\/\/www\.example\.com\/page\?id=)\d+/', '$1456', $link);

echo $newLink; // Output: https://www.example.com/page?id=456