archived-doc-zh/reference/strings/functions/printf.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.printf">
 <refnamediv>
  <refname>printf</refname>
  <refpurpose>输出格式化字符串</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>printf</methodname>
   <methodparam><type>string</type><parameter>format</parameter></methodparam>
   <methodparam rep="repeat"><type>mixed</type><parameter>values</parameter></methodparam>
  </methodsynopsis>
  <simpara>
   依据 <parameter>format</parameter> 格式参数产生输出。
  </simpara>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &strings.parameter.format;
    <varlistentry>
     <term><parameter>values</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回输出字符串的长度。
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  &strings.errors.sprintf;
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  &strings.changelog.sprintf;
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>printf</function>：多种 format 格式的示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$n =  43951789;
$u = -43951789;
$c = 65; // ASCII 65 is 'A'

// 注意两个 %% 的情况，这会打印一个字面上的 '%' 字符
printf("%%b = '%b'\n", $n); // 二进制表示
printf("%%c = '%c'\n", $c); // 打印 ascii 字符，与 chr() 函数相同
printf("%%d = '%d'\n", $n); // 标准整数表示
printf("%%e = '%e'\n", $n); // 科学计数法
printf("%%u = '%u'\n", $n); // 无符号正整数表示
printf("%%u = '%u'\n", $u); // 无符号负整数表示
printf("%%f = '%f'\n", $n); // 浮点数表示
printf("%%o = '%o'\n", $n); // 八进制表示
printf("%%s = '%s'\n", $n); // 字符串表示
printf("%%x = '%x'\n", $n); // 十六进制表示（小写）
printf("%%X = '%X'\n", $n); // 十六进制表示（大写）

printf("%%+d = '%+d'\n", $n); // 正整数上的符号说明符
printf("%%+d = '%+d'\n", $u); // 负整数上的符号说明符
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
%b = '10100111101010011010101101'
%c = 'A'
%d = '43951789'
%e = '4.39518e+7'
%u = '43951789'
%u = '4251015507'
%f = '43951789.000000'
%o = '247523255'
%s = '43951789'
%x = '29ea6ad'
%X = '29EA6AD'
%+d = '+43951789'
%+d = '-43951789'
]]>
    </screen>
   </example>

   <example>
    <title><function>printf</function>：字符串说明符</title>
    <programlisting role="php">
<![CDATA[
<?php
$s = 'monkey';
$t = 'many monkeys';

printf("[%s]\n",        $s); // 标准字符串输出
printf("[%10s]\n",      $s); // 带空格的右对齐
printf("[%-10s]\n",     $s); // 带空格的左对齐
printf("[%010s]\n",     $s); // 零填充也适用于字符串
printf("[%'#10s]\n",    $s); // 使用自定义填充字符“#”
printf("[%'#*s]\n", 10, $s); // 提供填充的宽度作为附加参数
printf("[%10.9s]\n",    $t); // 右对齐，但截断 9 个字符
printf("[%-10.9s]\n",   $t); // 左对齐，但截断 9 个字符
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
[monkey]
[    monkey]
[monkey    ]
[0000monkey]
[####monkey]
[####monkey]
[ many monk]
[many monk ]
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>print</function></member>
    <member><function>sprintf</function></member>
    <member><function>fprintf</function></member>
    <member><function>vprintf</function></member>
    <member><function>vsprintf</function></member>
    <member><function>vfprintf</function></member>
    <member><function>sscanf</function></member>
    <member><function>fscanf</function></member>
    <member><function>number_format</function></member>
    <member><function>date</function></member>
    <member><function>flush</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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