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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>Language Reference</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="configuration.changes.html">How to change configuration settings</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.basic-syntax.html">Basic syntax</a></div> <div class="up"><a href="index.html">PHP Manual</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div>  <h1 class="title">Language Reference</h1>                                                          <ul class="chunklist chunklist_book"><li><a href="language.basic-syntax.html">Basic syntax</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.basic-syntax.instruction-separation.html">Instruction separation</a></li><li><a href="language.basic-syntax.comments.html">Comments</a></li></ul></li><li><a href="language.types.html">Types</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.types.boolean.html">Booleans</a></li><li><a href="language.types.integer.html">Integers</a></li><li><a href="language.types.float.html">Floating point numbers</a></li><li><a href="language.types.string.html">Strings</a></li><li><a href="language.types.array.html">Arrays</a></li><li><a href="language.types.object.html">Objects</a></li><li><a href="language.types.resource.html">Resources</a></li><li><a href="language.types.null.html">NULL</a></li><li><a href="language.pseudo-types.html">Pseudo-types and variables used in this documentation</a></li><li><a href="language.types.type-juggling.html">Type Juggling</a></li></ul></li><li><a href="language.variables.html">Variables</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.variables.predefined.html">Predefined Variables</a></li><li><a href="language.variables.scope.html">Variable scope</a></li><li><a href="language.variables.variable.html">Variable variables</a></li><li><a href="language.variables.external.html">Variables From External Sources</a></li></ul></li><li><a href="language.constants.html">Constants</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.constants.predefined.html">Magic constants</a></li></ul></li><li><a href="language.expressions.html">Expressions</a></li><li><a href="language.operators.html">Operators</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.operators.arithmetic.html">Arithmetic Operators</a></li><li><a href="language.operators.assignment.html">Assignment Operators</a></li><li><a href="language.operators.bitwise.html">Bitwise Operators</a></li><li><a href="language.operators.comparison.html">Comparison Operators</a></li><li><a href="language.operators.errorcontrol.html">Error Control Operators</a></li><li><a href="language.operators.execution.html">Execution Operators</a></li><li><a href="language.operators.increment.html">Incrementing/Decrementing Operators</a></li><li><a href="language.operators.logical.html">Logical Operators</a></li><li><a href="language.operators.string.html">String Operators</a></li><li><a href="language.operators.array.html">Array Operators</a></li><li><a href="language.operators.type.html">Type Operators</a></li></ul></li><li><a href="language.control-structures.html">Control Structures</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="control-structures.if.html">if</a></li><li><a href="control-structures.else.html">else</a></li><li><a href="control-structures.elseif.html">elseif/else if</a></li><li><a href="control-structures.alternative-syntax.html">Alternative syntax for control structures</a></li><li><a href="control-structures.while.html">while</a></li><li><a href="control-structures.do.while.html">do-while</a></li><li><a href="control-structures.for.html">for</a></li><li><a href="control-structures.foreach.html">foreach</a></li><li><a href="control-structures.break.html">break</a></li><li><a href="control-structures.continue.html">continue</a></li><li><a href="control-structures.switch.html">switch</a></li><li><a href="control-structures.declare.html">declare</a></li><li><a href="function.return.html">return</a></li><li><a href="function.require.html">require</a></li><li><a href="function.include.html">include</a></li><li><a href="function.require-once.html">require_once</a></li><li><a href="function.include-once.html">include_once</a></li></ul></li><li><a href="language.functions.html">Functions</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="functions.arguments.html">Function arguments</a></li><li><a href="functions.returning-values.html">Returning values</a></li><li><a href="functions.variable-functions.html">Variable functions</a></li><li><a href="functions.internal.html">Internal (built-in) functions</a></li></ul></li><li><a href="language.oop.html">Classes and Objects (PHP 4)</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="keyword.extends.html">extends</a></li><li><a href="language.oop.constructor.html">Constructors</a></li><li><a href="keyword.paamayim-nekudotayim.html">Scope Resolution Operator (::)</a></li><li><a href="keyword.parent.html">parent</a></li><li><a href="language.oop.serialization.html">Serializing objects - objects in sessions</a></li><li><a href="language.oop.magic-functions.html">The magic functions __sleep and __wakeup</a></li><li><a href="language.oop.newref.html">References inside the constructor</a></li><li><a href="language.oop.object-comparison.html">Comparing objects</a></li></ul></li><li><a href="language.oop5.html">Classes and Objects (PHP 5)</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.oop5.basic.html">The Basics</a></li><li><a href="language.oop5.autoload.html">Autoloading Objects</a></li><li><a href="language.oop5.decon.html">Constructors and Destructors</a></li><li><a href="language.oop5.visibility.html">Visibility</a></li><li><a href="language.oop5.paamayim-nekudotayim.html">Scope Resolution Operator (::)</a></li><li><a href="language.oop5.static.html">Static Keyword</a></li><li><a href="language.oop5.constants.html">Class Constants</a></li><li><a href="language.oop5.abstract.html">Class Abstraction</a></li><li><a href="language.oop5.interfaces.html">Object Interfaces</a></li><li><a href="language.oop5.overloading.html">Overloading</a></li><li><a href="language.oop5.iterations.html">Object Iteration</a></li><li><a href="language.oop5.patterns.html">Patterns</a></li><li><a href="language.oop5.magic.html">Magic Methods</a></li><li><a href="language.oop5.final.html">Final Keyword</a></li><li><a href="language.oop5.cloning.html">Object cloning</a></li><li><a href="language.oop5.object-comparison.html">Comparing objects</a></li><li><a href="language.oop5.reflection.html">Reflection</a></li><li><a href="language.oop5.typehinting.html">Type Hinting</a></li><li><a href="language.oop5.late-static-bindings.html">Late Static Bindings</a></li><li><a href="language.oop5.references.html">Objects and references</a></li></ul></li><li><a href="language.namespaces.html">Namespaces</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.namespaces.definition.html">Namespace definition</a></li><li><a href="language.namespaces.using.html">Using namespaces</a></li><li><a href="language.namespaces.global.html">Global space</a></li><li><a href="language.namespaces.constant.html">__NAMESPACE__</a></li><li><a href="language.namespaces.rules.html">Name resolution rules</a></li></ul></li><li><a href="language.exceptions.html">Exceptions</a></li><li><a href="language.references.html">References Explained</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.references.whatdo.html">What References Do</a></li><li><a href="language.references.arent.html">What References Are Not</a></li><li><a href="language.references.pass.html">Passing by Reference</a></li><li><a href="language.references.return.html">Returning References</a></li><li><a href="language.references.unset.html">Unsetting References</a></li><li><a href="language.references.spot.html">Spotting References</a></li></ul></li><li><a href="reserved.variables.html">Predefined variables</a><ul class="chunklist chunklist_book chunklist_children"><li><a href="language.variables.superglobals.html">Superglobals</a> 鈥
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