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.

Results update live as you type — no button needed. The Example button fills a sample input.

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

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.

Example input

Try it with this sample — paste it into the box above:

?id=1&id=2&foo[]=bar&foo[bar]=baz

How to use PHP Query String Bypass Analyzer

  1. Enter or paste your data into the Enter PHP query string or URL box above.
  2. The result appears instantly in the Parsed representation & bypass analysis box — everything runs in your browser, nothing is uploaded.
  3. Use Copy or Download to keep the result, or Example to load a sample first.

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