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60 lines
2.4 KiB
XML
Executable File
60 lines
2.4 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 2946c8a267734a9e8696e1764f7436e6caa8909c Maintainer: jhdxr Status: ready -->
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<!-- CREDITS: mowangjuanzi, Luffy -->
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<chapter xml:id="language.operators" xmlns="http://docbook.org/ns/docbook" annotations="interactive">
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<title>运算符</title>
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<simpara>
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运算符是可以通过给出的一或多个值（用编程行话来说，表达式）来产生另一个值（因而整个结构成为一个表达式）的东西。
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</simpara>
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<para>
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运算符可按照其能接受几个值来分组。一元运算符只能接受一个值，例如
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<literal>!</literal>（<link linkend="language.operators.logical">逻辑取反运算符</link>）或
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<literal>++</literal>（<link linkend="language.operators.increment">递增运算符</link>）。
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二元运算符可接受两个值，例如熟悉的<link
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linkend="language.operators.arithmetic">算术运算符</link>
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<literal>+</literal>（加）和 <literal>-</literal>（减），大多数 PHP
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运算符都是这种。最后是唯一的<link
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linkend="language.operators.comparison.ternary">三元运算符</link> <literal>? :</literal>，可接受三个值；通常就简单称之为“三元运算符”（尽管称之为条件运算符可能更合适）。
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</para>
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<para>
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PHP 的运算符完整列表见下节<link
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linkend="language.operators.precedence">运算符优先级</link>。该节也解释了运算符优先级和结合方向，这控制着在表达式包含有若干个不同运算符时究竟怎样对其求值。
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</para>
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&language.operators.precedence;
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&language.operators.arithmetic;
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&language.operators.increment;
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&language.operators.assignment;
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&language.operators.bitwise;
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&language.operators.comparison;
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&language.operators.errorcontrol;
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&language.operators.execution;
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&language.operators.logical;
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&language.operators.string;
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&language.operators.array;
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&language.operators.type;
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&language.operators.functional;
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</chapter>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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