func-num-args.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.func-num-args" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>func_num_args</refname>
  <refpurpose>返回传递给函数的参数数量</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>func_num_args</methodname>
   <void/>
  </methodsynopsis>
  <para>
   获取传递给函数的参数数量。
  </para>
  <para>
   此函数可以与 <function>func_get_arg</function> 和 <function>func_get_args</function>
   结合使用，以便于允许用户定义的函数可以接受可变长度的参数列表。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回传递给当前用户定义函数的参数数量。
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   如果从用户定义的函数外部调用，则生成警告。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>func_num_args</function> 示例</title>
    <programlisting role="php">
<![CDATA[

<?php
function foo()
{
    echo "Number of arguments: ", func_num_args(), PHP_EOL;
}

foo(1, 2, 3);   
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Number of arguments: 3
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &note.func-named-params;
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><link linkend="functions.variable-arg-list"><literal>...</literal> 语法</link></member>
    <member><function>func_get_arg</function></member>
    <member><function>func_get_args</function></member>
    <member><methodname>ReflectionFunctionAbstract::getNumberOfParameters</methodname></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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