1<!DOCTYPE html> 2<html xmlns="http://www.w3.org/1999/xhtml" lang="en"> 3<head> 4 5 <meta charset="utf-8"> 6 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 7 8 <base href="https://www.php.net/docs.php"> 9 10 <title>PHP: Documentation</title> 11 12 <link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/fonts/Fira/fira.css" media="screen"> 13 <link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/fonts/Font-Awesome/css/fontello.css" media="screen"> 14 <link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/styles/theme-base.css" media="screen"> 15 <link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/styles/theme-medium.css" media="screen"> 16 17 <link rel="icon" type="image/svg+xml" sizes="any" href="https://www.php.net/favicon.svg?v=2"> 18 <link rel="icon" type="image/png" sizes="196x196" href="https://www.php.net/favicon-196x196.png?v=2"> 19 <link rel="icon" type="image/png" sizes="32x32" href="https://www.php.net/favicon-32x32.png?v=2"> 20 <link rel="icon" type="image/png" sizes="16x16" href="https://www.php.net/favicon-16x16.png?v=2"> 21 <link rel="shortcut icon" href="https://www.php.net/favicon.ico?v=2"> 22 23 <link rel="search" type="application/opensearchdescription+xml" href="https://www.php.net/phpnetimprovedsearch.src" title="Add PHP.net search"> 24 <link rel="alternate" type="application/atom+xml" href="https://www.php.net/releases/feed.php" title="PHP Release feed"> 25 <link rel="alternate" type="application/atom+xml" href="https://www.php.net/feed.atom" title="PHP: Hypertext Preprocessor"> 26 27 <link rel="canonical" href="https://www.php.net/docs.php"> 28 <link rel="shorturl" href="https://www.php.net/docs"> 29 <link rel="alternate" href="https://www.php.net/docs" hreflang="x-default"> 30 31 32 33<link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/fonts/Fira/fira.css" media="screen"> 34<link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/fonts/Font-Awesome/css/fontello.css" media="screen"> 35<link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/styles/theme-base.css" media="screen"> 36<link rel="stylesheet" type="text/css" href="/cached.php?t=&f=/styles/theme-medium.css" media="screen"> 37 38 39<meta name="Description" content="PHP is a popular general-purpose scripting language that powers everything from your blog to the most popular websites in the world." /> 40 41<meta name="twitter:card" content="summary_large_image" /> 42<meta name="twitter:site" content="@official_php" /> 43<meta name="twitter:title" content="PHP: Documentation" /> 44<meta name="twitter:description" content="PHP is a popular general-purpose scripting language that powers everything from your blog to the most popular websites in the world." /> 45<meta name="twitter:creator" content="@official_php" /> 46<meta name="twitter:image:src" content="https://www.php.net/images/meta-image.png" /> 47 48<meta itemprop="name" content="PHP: Documentation" /> 49<meta itemprop="description" content="PHP is a popular general-purpose scripting language that powers everything from your blog to the most popular websites in the world." /> 50<meta itemprop="image" content="https://www.php.net/images/meta-image.png" /> 51 52<meta property="og:image" content="https://www.php.net/images/meta-image.png" /> 53<meta property="og:description" content="PHP is a popular general-purpose scripting language that powers everything from your blog to the most popular websites in the world." /> 54 55<link href="https://fosstodon.org/@php" rel="me" /> 56<!-- Matomo -->
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navbar__search-button-mobile" 239 hidden 240 > 241 <svg 242 xmlns="http://www.w3.org/2000/svg" 243 aria-hidden="true" 244 width="24" 245 viewBox="0 0 24 24" 246 fill="none" 247 stroke="currentColor" 248 stroke-width="2" 249 stroke-linecap="round" 250 stroke-linejoin="round" 251> 252 <circle cx="11" cy="11" r="8"></circle> 253 <line x1="21" y1="21" x2="16.65" y2="16.65"></line> 254</svg> </button> 255 <button 256 id="navbar__menu-button" 257 aria-label="Menu" 258 class="navbar__icon-item navbar_icon-item--visually-aligned" 259 hidden 260 > 261 <svg xmlns="http://www.w3.org/2000/svg" 262 aria-hidden="true" 263 width="24" 264 viewBox="0 0 24 24" 265 fill="currentColor" 266> 267 <path d="M3,6H21V8H3V6M3,11H21V13H3V11M3,16H21V18H3V16Z" /> 268</svg> </button> 269 </div> 270 271 <div 272 id="navbar__backdrop" 273 class="navbar__backdrop" 274 ></div> 275 </div> 276 277 <div id="flash-message"></div> 278</nav> 279<nav id="trick"><div><dl> 280<dt><a href='/manual/en/getting-started.php'>Getting Started</a></dt> 281 <dd><a href='/manual/en/introduction.php'>Introduction</a></dd> 282 <dd><a href='/manual/en/tutorial.php'>
282A simple tutorial</a></dd> 283<dt><a href='/manual/en/langref.php'>Language Reference</a></dt> 284 <dd><a href='/manual/en/language.basic-syntax.php'>Basic syntax</a></dd> 285 <dd><a href='/manual/en/language.types.php'>Types</a></dd> 286 <dd><a href='/manual/en/language.variables.php'>Variables</a></dd> 287 <dd><a href='/manual/en/language.constants.php'>Constants</a></dd> 288 <dd><a href='/manual/en/language.expressions.php'>Expressions</a></dd> 289 <dd><a href='/manual/en/language.operators.php'>Operators</a></dd> 290 <dd><a href='/manual/en/language.control-structures.php'>Control Structures</a></dd> 291 <dd><a href='/manual/en/language.functions.php'>Functions</a></dd> 292 <dd><a href='/manual/en/language.oop5.php'>Classes and Objects</a></dd> 293 <dd><a href='/manual/en/language.namespaces.php'>Namespaces</a></dd> 294 <dd><a href='/manual/en/language.enumerations.php'>Enumerations</a></dd> 295 <dd><a href='/manual/en/language.errors.php'>Errors</a></dd> 296 <dd><a href='/manual/en/language.exceptions.php'>Exceptions</a></dd> 297 <dd><a href='/manual/en/language.fibers.php'>Fibers</a></dd> 298 <dd><a href='/manual/en/language.generators.php'>Generators</a></dd> 299 <dd><a href='/manual/en/language.attributes.php'>Attributes</a></dd> 300 <dd><a href='/manual/en/language.references.php'>References Explained</a></dd> 301 <dd><a href='/manual/en/reserved.variables.php'>Predefined Variables</a></dd> 302 <dd><a href='/manual/en/reserved.exceptions.php'>Predefined Exceptions</a></dd> 303 <dd><a href='/manual/en/reserved.interfaces.php'>Predefined Interfaces and Classes</a></dd> 304 <dd><a href='/manual/en/reserved.attributes.php'>Predefined Attributes</a></dd> 305 <dd><a href='/manual/en/context.php'>Context options and parameters</a></dd> 306 <dd><a href='/manual/en/wrappers.php'>Supported Protocols and Wrappers</a></dd> 307</dl> 308<dl> 309<dt><a href='/manual/en/security.php'>Security</a></dt> 310 <dd><a href='/manual/en/security.intro.php'>Introduction</a></dd> 311 <dd><a href='/manual/en/security.general.php'>General considerations</a></dd> 312 <dd><a href='/manual/en/security.cgi-bin.php'>Installed as CGI binary</a></dd> 313 <dd><a href='/manual/en/security.apache.php'>Installed as an Apache module</a></dd> 314 <dd><a href='/manual/en/security.sessions.php'>Session Security</a></dd> 315 <dd><a href='/manual/en/security.filesystem.php'>Filesystem Security</a></dd> 316 <dd><a href='/manual/en/security.database.php'>Database Security</a></dd> 317 <dd><a href='/manual/en/security.errors.php'>Error Reporting</a></dd> 318 <dd><a href='/manual/en/security.variables.php'>User Submitted Data</a></dd> 319 <dd><a href='/manual/en/security.hiding.php'>Hiding PHP</a></dd> 320 <dd><a href='/manual/en/security.current.php'>Keeping Current</a></dd> 321<dt><a href='/manual/en/features.php'>Features</a></dt> 322 <dd><a href='/manual/en/features.http-auth.php'>HTTP authentication with PHP</a></dd> 323 <dd><a href='/manual/en/features.cookies.php'>Cookies</a></dd> 324 <dd><a href='/manual/en/features.sessions.php'>Sessions</a></dd> 325 <dd><a href='/manual/en/features.file-upload.php'>Handling file uploads</a></dd> 326 <dd><a href='/manual/en/features.remote-files.php'>Using remote files</a></dd> 327 <dd><a href='/manual/en/features.connection-handling.php'>Connection handling</a></dd> 328 <dd><a href='/manual/en/features.persistent-connections.php'>Persistent Database Connections</a></dd> 329 <dd><a href='/manual/en/features.commandline.php'>Command line usage</a></dd> 330 <dd><a href='/manual/en/features.gc.php'>Garbage Collection</a></dd> 331 <dd><a href='/manual/en/features.dtrace.php'>DTrace Dynamic Tracing</a></dd> 332</dl> 333<dl> 334<dt><a href='/manual/en/funcref.php'>Function Reference</a></dt> 335 <dd><a href='/manual/en/refs.basic.php.php'>Affecting PHP's Behaviour</a></dd> 336 <dd><a href='/manual/en/refs.utilspec.audio.php'>Audio Formats Manipulation</a></dd> 337 <dd><a href='/manual/en/refs.remote.auth.php'>Authentication Services</a></dd> 338 <dd><a href='/manual/en/refs.utilspec.cmdline.php'>Command Line Specific Extensions</a></dd> 339 <dd><a href='/manual/en/refs.compression.php'>Compression and Archive Extensions</a></dd> 340 <dd><a href='/manual/en/refs.crypto.php'>Cryptography Extensions</a></dd> 341 <dd><a href='/manual/en/refs.database.php'>Database Extensions</a></dd> 342 <dd><a href='/manual/en/refs.calendar.php'>Date and Time Related Extensions</a></dd> 343 <dd><a href='/manual/en/refs.fileprocess.file.php'>File System Related Extensions</a></dd> 344 <dd><a href='/manual/en/refs.international.php'>Human Language and 345 Character Encoding Support</a></dd> 346 <dd><a href='/manual/en/refs.utilspec.image.php'>Image Processing and Generation</a></dd> 347 <dd><a href='/manual/en/refs.remote.mail.php'>Mail Related Extensions</a></dd> 348 <dd><a href='/manual/en/refs.math.php'>Mathematical Extensions</a></dd> 349 <dd><a href='/manual/en/refs.utilspec.nontext.php'>Non-Text MIME Output</a></dd> 350 <dd><a href='/manual/en/refs.fileprocess.process.php'>Process Control Extensions</a></dd> 351 <dd><a href='/manual/en/refs.basic.other.php'>Other Basic Extensions</a></dd> 352 <dd><a href='/manual/en/refs.remote.other.php'>Other Services</a></dd> 353 <dd><a href='/manual/en/refs.search.php'>Search Engine Extensions</a></dd> 354 <dd><a href='/manual/en/refs.utilspec.server.php'>Server Specific Extensions</a></dd> 355 <dd><a href='/manual/en/refs.basic.session.php'>Session Extensions</a></dd> 356 <dd><a href='/manual/en/refs.basic.text.php'>Text Processing</a></dd> 357 <dd><a href='/manual/en/refs.basic.vartype.php'>Variable and Type Related Extensions</a></dd> 358 <dd><a href='/manual/en/refs.webservice.php'>Web Services</a></dd> 359 <dd><a href='/manual/en/refs.utilspec.windows.php'>Windows Only Extensions</a></dd> 360 <dd><a href='/manual/en/refs.xml.php'>XML Manipulation</a></dd> 361 <dd><a href='/manual/en/refs.ui.php'>GUI Extensions</a></dd> 362</dl> 363<dl> 364<dt>Keyboard Shortcuts</dt><dt>?</dt> 365<dd>This help</dd> 366<dt>j</dt> 367<dd>Next menu item</dd> 368<dt>k</dt> 369<dd>Previous menu item</dd> 370<dt>g p</dt> 371<dd>Previous man page</dd> 372<dt>g n</dt> 373<dd>Next man page</dd> 374<dt>G</dt> 375<dd>Scroll to bottom</dd> 376<dt>g g</dt> 377<dd>Scroll to top</dd> 378<dt>g h</dt> 379<dd>Goto homepage</dd> 380<dt>g s</dt> 381<dd>Goto search<br>(current page)</dd> 382<dt>/</dt> 383<dd>Focus search box</dd> 384</dl></div></nav> 385<div id="goto"> 386 <div class="search"> 387 <div class="text"></div> 388 <div class="results"><ul></ul></div> 389 </div> 390</div> 391 392 393 394 395 396<div id="layout" class="clearfix"> 397 <section id="layout-content"> 398 399<h1>Documentation</h1> 400<p> 401 The PHP Manual is available online in a selection of languages. 402 Please pick a language from the list below.
403</p> 404 405<p> 406 View Online: 407<strong><a href="/manual/en/">English</a>, 408</strong><a href="/manual/de/">German</a>, 409<a href="/manual/es/">Spanish</a>, 410<a href="/manual/fr/">French</a>, 411<a href="/manual/it/">Italian</a>, 412<a href="/manual/ja/">Japanese</a>, 413<a href="/manual/pt_BR/">Brazilian Portuguese</a>, 414<a href="/manual/ru/">Russian</a>, 415<a href="/manual/tr/">Turkish</a>, 416<a href="/manual/uk/">Ukrainian</a>, 417<a href="/manual/zh/">Chinese (Simplified)</a> 418</p> 419 420<p> 421 Note that many languages are still being translated, and 422 the untranslated parts are still in English. Some translated 423 parts might be outdated. The translation teams are 424 <a href="https://doc.php.net/">open to contributions</a>. 425</p> 426 427<p> 428 The language currently being used as the default for you should be in 429 <strong>bold</strong> above. You can change the setting for this on the 430 <a href="/my.php">My PHP.net customization page</a>. 431</p> 432 433<p> 434 For downloadable formats, please visit our 435 <a href="download-docs.php">documentation downloads</a> page. 436</p> 437 438<p> 439 Information about php.net URL shortcuts can be found by visiting our 440 <a href="/urlhowto.php">Navigation tips & tricks page</a>. 441</p> 442 443<h2 class="content-header">More documentation</h2> 444<ul class="content-box listed"> 445 <li> 446 If you are interested in how the documentation is edited and translated, 447 you should read the <a href="https://doc.php.net/guide/">contribution guide</a>. 448 </li> 449 <li> 450 <a href="https://pear.php.net/manual/">Documentation of PEAR and the various 451 packages</a> can be found on a separate server. 452 </li> 453 <li> 454 You can still read a copy of the original <a href="/manual/phpfi2.php">PHP/FI 455 2.0 Manual</a> on our site, which we only host for historical purposes. 456 The same applies to the <a href="/manual/php3.php">PHP 3 Manual</a>. 457 </li> 458 <li> 459 The PHP 4 and PHP 5 documentation has been removed from the 460 manual, but archived versions still exist. For 461 more information, please read <a href="/manual/php4.php"> 462 Documentation for PHP 4</a> and <a href="manual/php5.php"> 463 Documentation for 5</a>, respectively. 464 </li> 465</ul> 466 467 </section><!-- layout-content --> 468 469 470 </div><!-- layout --> 471 472 <footer> 473 <div class="container footer-content"> 474 <div class="row-fluid"> 475 <ul class="footmenu"> 476 <li><a href="/copyright.php">Copyright © 2001-2026 The PHP Group</a></li> 477 <li><a href="/my.php">My PHP.net</a></li> 478 <li><a href="/contact.php">Contact</a></li> 479 <li><a href="/sites.php">Other PHP.net sites</a></li> 480 <li><a href="/privacy.php">Privacy policy</a></li> 481 <li><a href="https://github.com/php/web-php/blob/master/public/docs.php">View Source</a></li> 482 </ul> 483 </div> 484 </div> 485 </footer> 486
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493 494 495<a id="toTop" href="javascript:;"><span id="toTopHover"></span><img width="40" height="40" alt="To Top" src="/images/[email protected]"></a> 496 497<div id="search-modal__backdrop" class="search-modal__backdrop"> 498 <div 499 role="dialog" 500 aria-label="Search modal" 501 id="search-modal" 502 class="search-modal" 503 > 504 <div class="search-modal__header"> 505 <div class="search-modal__form"> 506 <div class="search-modal__input-icon"> 507 <!-- https://feathericons.com search --> 508 <svg xmlns="http://www.w3.org/2000/svg" 509 aria-hidden="true" 510 width="24" 511 viewBox="0 0 24 24" 512 fill="none" 513 stroke="currentColor" 514 stroke-width="2" 515 stroke-linecap="round" 516 stroke-linejoin="round" 517 > 518 <circle cx="11" cy="11" r="8"></circle> 519 <line x1="21" y1="21" x2="16.65" y2="16.65"></line> 520 </svg> 521 </div> 522 <input 523 type="search" 524 id="search-modal__input" 525 class="search-modal__input" 526 placeholder="Search docs" 527 aria-label="Search docs" 528 /> 529 </div> 530 531 <button aria-label="Close" class="search-modal__close"> 532 <!-- https://pictogrammers.com/library/mdi/icon/close/ --> 533 <svg 534 xmlns="http://www.w3.org/2000/svg" 535 aria-hidden="true" 536 width="24"
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