What are the best practices for filtering out specific, constantly changing values from a source code in PHP?

When filtering out specific, constantly changing values from a source code in PHP, it is best to use regular expressions to match and remove those values. Regular expressions provide a flexible and powerful way to search for patterns within strings and replace them with desired values.

// Sample code snippet to filter out specific values using regular expressions
$sourceCode = "This is a sample source code with some unwanted values.";
$filteredCode = preg_replace('/unwanted/', '', $sourceCode);
echo $filteredCode;