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A server-side scripting language powering a large portion of the web, including WordPress and Laravel applications.
Rasmus Lerdorf created PHP in 1994 as a set of CGI scripts for tracking visits to his personal homepage — "Personal Home Page Tools" — and it evolved into the most widely deployed server-side web language in history. PHP powers roughly 75% of websites with known server-side languages, including WordPress (which alone runs over 40% of all websites), Drupal, Joomla, MediaWiki, and major platforms like Facebook (which developed the HHVM runtime and Hack language from PHP). Modern PHP bears little resemblance to its early reputation: PHP 8.x introduced JIT compilation, named arguments, attributes, enums, fibers for async programming, readonly properties, and intersection types.
The Composer package manager and the PSR standards from the PHP-FIG have professionalized the ecosystem, and frameworks like Laravel, Symfony, and Slim provide elegant architectures for building APIs and web applications. Laravel in particular has attracted a new generation of developers with its expressive syntax, Eloquent ORM, and rich ecosystem including Forge, Vapor, and Livewire. PHP's execution model — where each request bootstraps a fresh process — provides natural isolation and simplifies deployment compared to long-running application servers.
Testing tools like PHPUnit and Pest, static analyzers like PHPStan and Psalm, and code formatters like PHP-CS-Fixer have brought PHP development practices in line with other enterprise languages. Hosting support is ubiquitous, from shared hosting to containerized deployments.
PHP applications frequently mix logic, templates, and configuration, making diffs critical for catching changes that affect security or data handling. Comparing files reveals modified SQL query construction that may introduce injection vulnerabilities, altered authentication middleware that changes access control, changed Composer dependency versions that pull in breaking updates, and modified routing definitions that expose or hide endpoints.
WordPress plugin and theme updates especially benefit from careful diffing, as a single hook or filter change can affect site-wide behavior.
UtraDiff compares PHP files with PHP syntax highlighting, covering mixed HTML/PHP blocks, namespaces, and type declarations. Side-by-side view aligns class methods and trait definitions across panels. The whitespace ignore toggle filters out PSR-12 auto-formatting noise so reviewers focus on logic.
Alt+Arrow navigation jumps between changed functions. Language-aware tokenization distinguishes PHP tags and heredoc strings from control flow changes, making template file diffs readable.
Supported extensions: .php