composer init # Create composer.json
composer version # Show version

# Install Composer
composer install # Install dependencies
composer install --dry-run # Test install

# Add Packages
composer require vendor/package # Latest version
composer require vendor/package --dev # Dev dependencies

# Update Packages
composer update # Update all packages
composer update --with-dependencies # Update dependencies
composer update vendor/package # Update specific package
composer update vendor/* # Update all packages from vendor
composer update --lock # Update lock file

# Remove Package
composer remove vendor/package # Remove package

# Update Autoloader
composer dumpautoload -o # Optimized autoloader

# Show Package Info
composer show vendor/package # Show package info
composer show --all vendor/package # Show all package info

# Validate Composer.json
composer validate # Validate composer.json

# Create Project
composer create-project vendor/package folder # Create project

# Scripts
composer run-script script-name # Run script
composer run-script --list # List scripts

# Composer Cache
composer clear-cache # Clear cache
composer clearcache # Clear cache

# Composer Diagnose
composer diagnose # Diagnose composer issues

# Composer Self Update
composer self-update # Update composer
composer self-update --rollback # Rollback composer

# Composer Global
composer global require vendor/package # Install globally
composer global update vendor/package # Update globally
composer global remove vendor/package # Remove globally
composer global show # Show global packages
composer global show --all # Show all global packages

# Composer Config
composer config # Show config
composer config --list # List config
composer config --global # Global config

Versioning

"require": {
    // Exact version to 1.5.4
    "vendor/package": "1.5.4",
        
    // Greater or lower bounds
    "vendor/package": ">=1.5.0", // Anything above 1.5.0
    "vendor/package": "<1.5.0", // Anything below 1.5.0
    
    // Wildcard
    "vendor/package": "1.5.*", // >=1.5 <1.6
    
    // Next significant release
    "vendor/package": "~1.5", // >=1.5 <2.0.0 
    "vendor/package": "~1.5.2", // >=1.5.2 <1.6.0
    
    // Next release, major version fixed
    "vendor/package": "^1.5.2", // >=1.5.2 <2.0.0 
    "vendor/package": "^0.5.2", // >=0.5.2 <0.6.0
}