PHP Query String Bypass Analyzer

For PHP developers and security testers: instantly parse and visualize how PHP interprets duplicate keys, array syntax, and nested parameters. Detect HTTP parameter pollution and bypass vulnerabilities before attackers do.

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 parameter names and shows how PHP overwrites values

Parses array syntax (foo[] and foo[bar]) into structured JSON

Highlights potential bypass techniques like parameter pollution

Works with any query string, including URL-encoded characters

No server-side processing—all analysis happens in your browser

FAQ

What is HTTP parameter pollution?

HTTP parameter pollution (HPP) occurs when a web application receives multiple parameters with the same name. Depending on how the server-side code handles them, it can lead to security bypasses, such as overriding intended values or injecting malicious data.

How does PHP handle duplicate query parameters?

PHP typically takes the last value for a duplicate parameter. For example, in '?id=1&id=2', $_GET['id'] will be '2'. This behavior can be exploited if the application expects only one value.

What does the array syntax foo[]=bar mean in PHP?

In PHP, 'foo[]=bar' creates an array where 'bar' is appended as a new element. 'foo[bar]=baz' creates an associative array with key 'bar' and value 'baz'. This can be used to bypass input validation that expects a scalar value.

Is this tool safe to use with sensitive data?

Yes, all parsing is done client-side in your browser. No data is sent to our servers, ensuring your query strings remain private.

More Developer Utilities tools

🔧

Cron Expression Parser – Understand & Debug Schedules

Parse cron expressions into readable schedules. Get next run times, frequency, and validat
🔧

Cron Expression Validator - Check Cron Syntax Online

Validate cron expressions instantly. Paste a crontab schedule and get a valid/invalid verd
🔧

JWT Decoder - Decode & Verify JWT Tokens Online

Decode JWT tokens instantly: view header, payload, and signature. Validate structure and e
🔧

Markdown Dynamic Server: HTML to Markdown Converter

Instantly convert HTML snippets to clean Markdown for docs and static sites. No manual rew

← All tools · Developer Utilities