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143 lines
4.3 KiB
HTML
143 lines
4.3 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>"Adds" two variant values together and returns the result</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.variant-add" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">variant_add</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">variant_add</span> — <span class="dc-title">"Adds" two variant values together and returns the result</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.variant-add-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>variant_add</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">$left</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$right</code></span>
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) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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Adds <code class="parameter">left</code> to <code class="parameter">right</code> using
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the following rules (taken from the MSDN library), which correspond to
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those of Visual Basic:
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<table class="doctable table">
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<caption><strong>Variant Addition Rules</strong></caption>
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<thead>
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<tr>
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<th>If</th>
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<th>Then</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>Both expressions are of the string type</td>
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<td>Concatenation</td>
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</tr>
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<tr>
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<td>One expression is a string type and the other a
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character</td>
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<td>Addition</td>
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</tr>
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<tr>
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<td>One expression is numeric and the other is a string</td>
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<td>Addition</td>
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</tr>
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<tr>
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<td>Both expressions are numeric</td>
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<td>Addition</td>
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</tr>
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<tr>
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<td>Either expression is NULL</td>
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<td>NULL is returned</td>
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</tr>
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<tr>
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<td>Both expressions are empty</td>
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<td>Integer subtype is returned</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.variant-add-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">left</code></dt>
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<dd>
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<p class="para">
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The left operand.
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</p>
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</dd>
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<dt>
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<code class="parameter">right</code></dt>
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<dd>
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<p class="para">
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The right operand.
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</p>
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</dd>
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</dl>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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对于所有变量运算函数，本函数的参数可以是 PHP
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内置的类型（整数，字符串，浮点数，布尔型或者
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<strong><code>NULL</code></strong>），或者是一个 COM，VARIANT 或者 DOTNET 类的实例。PHP
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内置类型将会使用和构造<a href="class.variant.html" class="xref">VARIANT</a>类相同的规则转换成变量。COM 和 DOTNET
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对象的值将会取其默认属性并被当成变量值使用。
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</p>
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<p class="para">
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变量运算函数是同名函数在 COM
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库中的外包；有关此类函数的更多信息参见 MSDN
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库。PHP 函数命名有少许区别，例如 PHP
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中的 <span class="function"><strong>variant_add()</strong></span> 对应于
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MSDN 文档中的 <em>VarAdd()</em>。
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</p>
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</p></blockquote>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.variant-add-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the result.
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.variant-add-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="variant_sub.html" class="function" rel="rdfs-seeAlso">variant_sub()</a> - Subtracts the value of the right variant from the left variant value</span></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> |