Uncover PHP Query String Parsing Anomalies

For security researchers and penetration testers, this tool reveals how PHP interprets query strings, highlighting duplicate parameters, array injection, and other tricks that can bypass IDS/IPS/WAF filters.

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Why use PHP Query String Bypass Analyzer?

Detects duplicate parameters and shows which value PHP uses

Highlights array injection via [] syntax

Parses nested arrays and complex parameter structures

Provides a clear JSON representation for easy analysis

Instant results with no setup or registration

How it works

  1. Paste a PHP query string or full URL with parameters into the input box.
  2. Click the 'Analyze Bypass' button.
  3. Review the parsed JSON output showing how PHP interprets each parameter.
  4. Identify potential bypass vectors such as duplicate keys or array injection.

FAQ

How does PHP handle duplicate query string parameters?

PHP typically uses the last value for a non-array parameter. For example, '?id=1&id=2' results in $_GET['id'] = '2'. This can be used to bypass filters that only check the first occurrence.

What is array injection in PHP query strings?

By appending '[]' to a parameter name (e.g., '?foo[]=bar'), PHP creates an array. This can bypass filters that expect a scalar value and may lead to unexpected behavior.

Can this tool help test WAF rules?

Yes, by showing how PHP interprets the query string, you can craft payloads that evade signature-based WAFs that don't account for PHP's parsing quirks.

Is this tool safe to use on any input?

Yes, it only parses the query string locally and does not send any data to a server. It's purely for analysis.