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105 lines
6.9 KiB
HTML
105 lines
6.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>输出字符串</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.print" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">print</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">print</span> — <span class="dc-title">输出字符串</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.print-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>print</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$arg</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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输出 <code class="parameter">arg</code>。
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</p>
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<p class="para">
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<span class="function"><strong>print</strong></span> 实际上不是函数（而是语言结构），所以可以不用圆括号包围参数列表。
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</p>
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<p class="para">
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和 <em>echo</em> 最主要的区别：
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<em>print</em> 仅支持一个参数，并总是返回 1。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.print-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">arg</code></dt>
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<dd>
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<p class="para">
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输入数据。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.print-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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总是返回 <em>1</em>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.print-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-5933">
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<p><strong>Example #1 <span class="function"><strong>print</strong></span> 范例</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">print(</span><span style="color: #DD0000">"Hello World"</span><span style="color: #007700">);<br /><br />print </span><span style="color: #DD0000">"print() also works without parentheses."</span><span style="color: #007700">;<br /><br />print </span><span style="color: #DD0000">"This spans<br />multiple lines. The newlines will be<br />output as well"</span><span style="color: #007700">;<br /><br />print </span><span style="color: #DD0000">"This spans\nmultiple lines. The newlines will be\noutput as well."</span><span style="color: #007700">;<br /><br />print </span><span style="color: #DD0000">"escaping characters is done \"Like this\"."</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// 可以在打印语句中使用变量<br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= </span><span style="color: #DD0000">"foobar"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= </span><span style="color: #DD0000">"barbaz"</span><span style="color: #007700">;<br /><br />print </span><span style="color: #DD0000">"foo is </span><span style="color: #0000BB">$foo</span><span style="color: #DD0000">"</span><span style="color: #007700">; </span><span style="color: #FF8000">// foo is foobar<br /><br />// 也可以使用数组<br /></span><span style="color: #0000BB">$bar </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"value" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"foo"</span><span style="color: #007700">);<br /><br />print </span><span style="color: #DD0000">"this is </span><span style="color: #007700">{</span><span style="color: #0000BB">$bar</span><span style="color: #007700">[</span><span style="color: #DD0000">'value'</span><span style="color: #007700">]}</span><span style="color: #DD0000"> !"</span><span style="color: #007700">; </span><span style="color: #FF8000">// this is foo !<br /><br />// 使用单引号将打印变量名，而不是变量的值<br /></span><span style="color: #007700">print </span><span style="color: #DD0000">'foo is $foo'</span><span style="color: #007700">; </span><span style="color: #FF8000">// foo is $foo<br /><br />// 如果没有使用任何其他字符，可以仅打印变量<br /></span><span style="color: #007700">print </span><span style="color: #0000BB">$foo</span><span style="color: #007700">; </span><span style="color: #FF8000">// foobar<br /><br /></span><span style="color: #007700">print <<<END<br /></span><span style="color: #DD0000">This uses the "here document" syntax to output<br />multiple lines with </span><span style="color: #0000BB">$variable</span><span style="color: #DD0000"> interpolation. Note<br />that the here document terminator must appear on a<br />line with just a semicolon no extra whitespace!<br /></span><span style="color: #007700">END;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.print-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">因为是一个语言构造器而不是一个函数，不能被
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<a href="functions.variable_functions.html" class="link">可变函数</a> 调用。
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</span>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.print-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="echo.html" class="function" rel="rdfs-seeAlso">echo</a> - 输出一个或多个字符串</span></li>
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<li class="member"><span class="function"><a href="printf.html" class="function" rel="rdfs-seeAlso">printf()</a> - 输出格式化字符串</span></li>
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<li class="member"><span class="function"><a href="flush.html" class="function" rel="rdfs-seeAlso">flush()</a> - 刷新输出缓冲</span></li>
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<li class="member"><a href="language.types.string.html#language.types.string.syntax.heredoc" class="link">Heredoc syntax</a></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |