PHP — Hello World
The classic hello-world in PHP — an opening tag and echo — for testing highlighters, the PHP interpreter, and parsers.
<?php
// The classic first program, in PHP.
echo "Hello, world!\n";
Specifications
- Language
- PHP
- Kind
- hello-world
- Lines
- 4
- Encoding
- UTF-8
- Line Endings
- LF
Testing contract
Expected to pass- Scenario
- Run the file with the PHP CLI and capture stdout.
- Expected result
- It prints exactly `Hello, world!` and a newline. The file opens with `<?php` and deliberately has no closing `?>`, which is the PSR-12 rule for files that contain only PHP - a closing tag would risk emitting stray whitespace.
What is a .php file?
PHP (.php) is a plain-text source file for the PHP language — a dynamically typed, server-side scripting language designed for web development, embeddable in HTML. Modern PHP supports classes, namespaces, type declarations, and closures, and powers a large share of web back-ends and CMS platforms.
How to use this file
Use an example .php file to test syntax highlighters, the PHP interpreter and linters (PHP_CodeSniffer, PHPStan), formatters, and parser or language-detection tooling.
How to use this file for testing
“PHP — Hello World” is a deterministic Novus Examples fixture for Syntax highlighting, Code parsing, Editor testing. Idiomatic hello-world programs and realistic snippets across sixteen languages, exercising comments, string escapes, interpolation, numeric literals, and language keywords — for testing syntax highlighters, editor themes, and tree-sitter grammars.
Documented properties for this file: PHP · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This is a short, known-correct source file. Run it through your syntax highlighter, linter, formatter, tree-sitter grammar, or parser, and open it in the in-browser editor to tweak and re-download. Each snippet exercises comments, string escapes, literals, and language keywords.
Code examples
php hello-world.phpRelated files
- phpPHP — Invoice (enum, class, promoted properties)A realistic modern-PHP snippet with strict types, a namespace, a backed enum, a final class with constructor-promoted readonly properties, and array_reduce with an arrow function — for testing highlighters, PHPStan, and parsers.
- phpPHP AttributesPHP 8 attributes SAMPLE for PHP tooling.
- phpPhp Lint Invalid — Error Suppression InvalidIntentionally lint-bait SAMPLE php snippet (error-suppression-invalid) for rule-engine tests.
- cC — Hello WorldThe classic hello-world in C — an include, main, and printf — for testing highlighters, C compilers, and parsers against the canonical first program.
- cC — Linked list (structs, malloc, pointers)A realistic C program: a singly linked list with a typedef struct, malloc/free memory management, pointer walking, and error handling — for testing highlighters, compilers, and static analysers.
- cC StructC struct SAMPLE for clangd / highlighter fixtures.
Generated by generation/code_samples.py. Free for any use, no attribution required — license.