PHP (programming language)
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| PHP (programming language) | |
|---|---|
| Name | PHP |
| Paradigm | Imperative, Object-oriented, Procedural, Functional |
| Designer | Rasmus Lerdorf |
| Developer | The PHP Group |
| First appeared | 1995 |
| Typing | Dynamic, Weak |
| License | PHP License |
| Website | php.net |
PHP (programming language)
PHP is a widely used open-source server-side scripting language originally created for web development. It powers broadly deployed platforms and services and has influenced many projects across industry, academia, and government. Over decades it has been adopted by major companies and communities, evolving through standards and implementations.
History
PHP began as a personal project by Rasmus Lerdorf and quickly spread through adoption by early web projects and hosting providers. Influential figures and organizations such as Zend Technologies, Andi Gutmans, and Zeev Suraski contributed significant rewrites and the Zend Engine, shaping later releases. Major releases and milestones were influenced by standards and events involving the Apache Software Foundation, NGINX Inc., Microsoft, and the Free Software Foundation. The language’s growth paralleled the expansion of projects like WordPress, Drupal, and Joomla, and was driven by hosting ecosystems in data centers and cloud providers such as Amazon Web Services and DigitalOcean. Language stewardship and versioned releases have been coordinated by The PHP Group and engaged communities including contributors from Mozilla Foundation, Facebook, and Google.
Language Design and Features
PHP’s design emphasizes rapid development for web applications and integration with HTML documents, templating engines, and HTTP servers. Key design contributors and projects — such as Zend Engine, Facebook’s Hack research, and HHVM — explored performance and type system changes inspired by academic research from institutions like MIT, Stanford University, and Carnegie Mellon University. The language supports imperative, object-oriented, and functional programming paradigms and includes features influenced by languages and systems developed by Oracle, IBM Research, and Sun Microsystems. Type declarations, generators, closures, and namespaces were introduced progressively, following input from developer communities and corporate adopters including Netflix, Etsy, and Wikimedia Foundation.
Syntax and Semantics
PHP’s syntax blends elements familiar to users of C, Perl, and Java, a design informed by languages like Tcl and Python as examined in university curricula at Harvard, UC Berkeley, and ETH Zürich. Semantics include dynamic typing, automatic memory management with a cycle-collecting garbage collector, and a variable scoping model supporting global, local, and superglobal variables used in web frameworks developed at institutions like MIT’s CSAIL and Stanford’s CS departments. Control structures, function and class declarations, and error handling mirror features seen in systems from Microsoft Research, Bell Labs, and Xerox PARC. The language’s E_STRICT and E_DEPRECATED constants and runtime behavior relate to ecosystem practices adopted by projects such as Drupal, Magento, and MediaWiki.
Implementation and Virtual Machines
Primary implementations include the reference engine maintained by The PHP Group and the Zend Engine, as well as alternative runtimes like HHVM developed by Facebook and projects inspired by the Java Virtual Machine and .NET CLR. Implementations have been benchmarked and compared in research from universities including Princeton and the University of Cambridge, and by industry labs at Intel and AMD. JIT compilation, opcode caches such as APCu, and platform integrations with Linux distributions, FreeBSD, and Windows Server shape deployment options used by enterprises such as Walmart, Dropbox, and LinkedIn.
Standard Library and Extensions
The standard library offers modules for networking, cryptography, database access, and image processing, maintained with input from contributors affiliated with organizations such as the OpenSSL Project, MySQL AB (now Oracle), PostgreSQL Global Development Group, and SQLite authors. Extensions enable connectivity to services and protocols from Microsoft SQL Server, Amazon RDS, Redis, and Memcached, and support formats and protocols used by Wikimedia Foundation APIs, Twitter’s developer platform, and Google Cloud services. Packaging and distribution of extensions are coordinated through PECL and community repositories supported by Linux Foundation projects and vendor ecosystems.
Ecosystem and Tooling
The PHP ecosystem encompasses major content management systems like WordPress, e-commerce platforms like Magento (Adobe), and frameworks such as Laravel, Symfony, and CodeIgniter, with corporate users including Facebook, Wikipedia, and Slack historically influencing tooling choices. Tooling includes Composer for dependency management, PHPUnit for testing, Xdebug for debugging, and static analysis tools influenced by academic tools from ETH Zürich and tooling trends from Microsoft Visual Studio, JetBrains, and GitHub. Continuous integration and deployment are supported by services and platforms such as Jenkins, GitLab, CircleCI, and Kubernetes clusters used by enterprises and research centers.
Criticism and Security Concerns
PHP has faced criticism regarding inconsistent naming conventions, historical language design decisions, and legacy APIs stemming from early development practices predating standards bodies like ECMA and ISO. Security concerns include common web vulnerabilities such as SQL injection, cross-site scripting, and session fixation; mitigations and guidelines have been developed and promulgated by organizations like OWASP, CERT, and ENISA, and adopted by projects including Drupal, Joomla, and Magento. Academic analyses from universities and incident reports from companies like Yahoo and GitHub informed hardening practices, adoption of secure libraries such as libsodium, and frameworks enforcing input validation and output escaping.