Replacing Deprecated Filter Constants: FILTER_SANITIZE_STRING and FILTER_SANITIZE_STRIPPED
With PHP 8.1, the constant filters FILTER_SANITIZE_STRING and FILTER_SANITIZE_STRIPPED have become deprecated. This has sparked concerns among developers who previously used these filters for string sanitization.
The Reason for Deprecation
These filter constants were deemed confusing and unclear in their purpose. Their functionality overlapped with other string filters, leading to confusion and inconsistent results. The PHP community decided to discontinue their support.
Replacement Options
There are several options available to replace these deprecated filters:
The following code demonstrates a polyfill function for filter_string_polyfill:
function filter_string_polyfill(string $string): string { $str = preg_replace('/\x00|<[^>]*>?/', '', $string); return str_replace(["'", '"'], ['&#39;', '&#34;'], $str); }
Remember, sanitizing input is less effective than escaping output. Focus on encoding potentially vulnerable data before it is displayed or used.
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