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162 lines
7.5 KiB
HTML
162 lines
7.5 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>Returns the number of arguments passed to the function</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.func-num-args" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">func_num_args</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">func_num_args</span> — <span class="dc-title">Returns the number of arguments passed to the function</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.func-num-args-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>func_num_args</strong></span>
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( <span class="methodparam">void</span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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Gets the number of arguments passed to the function.
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</p>
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<p class="para">
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This function may be used in conjunction with
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<span class="function"><a href="func_get_arg.html" class="function">func_get_arg()</a></span> and <span class="function"><a href="func_get_args.html" class="function">func_get_args()</a></span>
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to allow user-defined functions to accept variable-length argument lists.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.func-num-args-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 number of arguments passed into the current user-defined
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function.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.func-num-args-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</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>5.3.0</td>
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<td>
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This function can now be used in parameter lists.
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</td>
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</tr>
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<tr>
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<td>5.3.0</td>
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<td>
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If this function is called from the outermost scope of a file
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which has been included by calling <span class="function"><a href="include.html" class="function">include</a></span>
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or <span class="function"><a href="require.html" class="function">require</a></span> from within a function in the
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calling file, it now generates a warning and returns -1.
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</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 errors" id="refsect1-function.func-num-args-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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Generates a warning if called from outside of a user-defined function.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.func-num-args-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-6204">
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<p><strong>Example #1 <span class="function"><strong>func_num_args()</strong></span> example</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">function </span><span style="color: #0000BB">foo</span><span style="color: #007700">()<br />{<br /> </span><span style="color: #0000BB">$numargs </span><span style="color: #007700">= </span><span style="color: #0000BB">func_num_args</span><span style="color: #007700">();<br /> echo </span><span style="color: #DD0000">"Number of arguments: </span><span style="color: #0000BB">$numargs</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">foo</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: #0000BB">3</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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Number of arguments: 3
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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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<p class="para">
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<div class="example" id="example-6205">
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<p><strong>Example #2 <span class="function"><strong>func_num_args()</strong></span> example before and
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after PHP 5.3</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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test.php<br /><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">foo</span><span style="color: #007700">() {<br /> include </span><span style="color: #DD0000">'./fna.php'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">foo</span><span style="color: #007700">(</span><span style="color: #DD0000">'First arg'</span><span style="color: #007700">, </span><span style="color: #DD0000">'Second arg'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?><br /></span><br />fna.php<br /><span style="color: #0000BB"><?php<br /><br />$num_args </span><span style="color: #007700">= </span><span style="color: #0000BB">func_num_args</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">var_export</span><span style="color: #007700">(</span><span style="color: #0000BB">$num_args</span><span style="color: #007700">);<br /><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>
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Output previous to PHP 5.3:
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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2
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</pre></div>
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</div>
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<div class="example-contents"><p>
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Output in PHP 5.3 and later will be something similar to:
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Warning: func_num_args(): Called from the global scope - no function
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context in /home/torben/Desktop/code/ml/fna.php on line 3
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-1
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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.func-num-args-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">因为函数依赖于当前作用域以确定参数的细节，所以在
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5.3.0 以前的版本中不能用作函数的参数。如必须传递此值时，可将结果赋与一个变量，然后用此变量进行传递。</p></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.func-num-args-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="func_get_arg.html" class="function" rel="rdfs-seeAlso">func_get_arg()</a> - 返回参数列表的某一项</span></li>
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<li class="member"><span class="function"><a href="func_get_args.html" class="function" rel="rdfs-seeAlso">func_get_args()</a> - 返回一个包含函数参数列表的数组</span></li>
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<li class="member"><span class="methodname"><a href="reflectionfunctionabstract.getnumberofparameters.html" class="methodname" rel="rdfs-seeAlso">ReflectionFunctionAbstract::getNumberOfParameters()</a> - 获取参数数目</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> |