What is the purpose of the preg_replace function in the provided PHP code?

The purpose of the preg_replace function in the provided PHP code is to replace any non-alphanumeric characters in a string with an underscore. This is commonly used to sanitize input data or format strings for specific requirements. 

// Replace non-alphanumeric characters with an underscore
$string = "Hello, World! This is a test string.";
$cleaned_string = preg_replace('/[^a-zA-Z0-9]/', '_', $string);

echo $cleaned_string;

Keywords

preg_replace PHP regular expression string manipulation data sanitization

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