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104 lines
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104 lines
9.6 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>获取变量的布尔值</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.boolval" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">boolval</h1>
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<p class="verinfo">(PHP 5 >= 5.5.0, PHP 7)</p><p class="refpurpose"><span class="refname">boolval</span> — <span class="dc-title">获取变量的布尔值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.boolval-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>boolval</strong></span>
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( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$var</code></span>
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) : <span class="type">boolean</span></div>
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<p class="para rdfs-comment">
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返回<code class="parameter">var</code>变量的布尔值 .
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.boolval-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">var</code></dt>
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<dd>
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<p class="para">
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标量类型会被转化成<span class="type"><span class="type 布尔">布尔</span></span>类型.
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.boolval-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<code class="parameter">var</code>变量的布尔值.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.boolval-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-6354">
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<p><strong>Example #1 <span class="function"><strong>boolval()</strong></span> examples</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">echo </span><span style="color: #DD0000">'0: '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'42: '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #0000BB">42</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'0.0: '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #0000BB">0.0</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'4.2: '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #0000BB">4.2</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'"": '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #DD0000">""</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'"string": '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #DD0000">"string"</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'"0": '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #DD0000">"0"</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'"1": '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(</span><span style="color: #DD0000">"1"</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'[1, 2]: '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">([</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">]) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'[]: '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">([]) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'stdClass: '</span><span style="color: #007700">.(</span><span style="color: #0000BB">boolval</span><span style="color: #007700">(new </span><span style="color: #0000BB">stdClass</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'true' </span><span style="color: #007700">: </span><span style="color: #DD0000">'false'</span><span style="color: #007700">).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<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 class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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0: false
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42: true
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0.0: false
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4.2: true
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"": false
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"string": true
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"0": false
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"1": true
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[1, 2]: true
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[]: false
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stdClass: true
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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 seealso" id="refsect1-function.boolval-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="floatval.html" class="function" rel="rdfs-seeAlso">floatval()</a> - 获取变量的浮点值</span></li>
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<li class="member"><span class="function"><a href="intval.html" class="function" rel="rdfs-seeAlso">intval()</a> - 获取变量的整数值</span></li>
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<li class="member"><span class="function"><a href="strval.html" class="function" rel="rdfs-seeAlso">strval()</a> - 获取变量的字符串值</span></li>
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<li class="member"><span class="function"><a href="settype.html" class="function" rel="rdfs-seeAlso">settype()</a> - 设置变量的类型</span></li>
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<li class="member"><span class="function"><a href="is_bool.html" class="function" rel="rdfs-seeAlso">is_bool()</a> - 检测变量是否是布尔型</span></li>
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<li class="member"><a href="language.types.type_juggling.html" class="link">Type juggling</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> |