How to use this developer tool
- Paste PHP code.
- Select a target PHP version.
- Choose Basic, Standard, or Strict analysis.
- Run the checker and review issues by severity.
- Copy or download the report.
#121 · Programming Language Tools Developer Tool
PHP Checker
Check PHP code for likely syntax mistakes, risky functions, compatibility concerns, and maintainability issues directly in your browser. The tool performs static analysis only and never executes or uploads your code.
Developer Input
Local browser processingAd space
What this developer tool does
It scans PHP source for structural errors, common coding mistakes, risky APIs, version-sensitive syntax, and quality warnings. Results include line, column, severity, rule ID, and a suggested fix.
Bracket and string checks → rule-based syntax patterns → security rules → compatibility rules → quality summary. Runtime execution is not performed.
No browser-only checker can replace php -l, PHPStan, Psalm, or a real test suite. Treat “No issues detected” as a static-analysis result, not proof of runtime correctness.
Example
Input:
<?php $name = $_GET['name'] echo $name;
Output: missing semicolon and direct superglobal usage warnings.
Tips for better output
- Include the opening PHP tag for the most reliable scan.
- Use Strict mode before deployment.
- Verify final code with the official PHP interpreter.
FAQ
How can I check PHP code for syntax errors online?
Paste the code and run the static checker. It reports likely bracket, string, semicolon, declaration, and control-structure problems with locations.
How do I find missing semicolons in PHP code?
The checker examines statement-like lines and flags probable missing semicolons while avoiding common block and control-flow lines.
How can I detect unsafe PHP functions before deployment?
Enable security checks to flag APIs such as eval, exec, shell_exec, system, passthru, proc_open, and unserialize.
Why does my PHP code pass a checker but fail on the server?
Browser analysis cannot execute PHP, load extensions, resolve files, connect to services, or reproduce your server configuration.
How can I check PHP 8 compatibility in browser-based code?
Select a target version. The tool flags known version-sensitive constructs, but final verification should use the target PHP runtime.
Related developer tools
Checker coverage
| Module | Purpose |
|---|---|
| Syntax | Brackets, strings, semicolons |
| Security | Risky functions and input usage |
| Compatibility | Version-sensitive features |
| Quality | Long functions and deep nesting |