stat.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.stat" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>stat</refname>
  <refpurpose>给出文件的信息</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>stat</methodname>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
  </methodsynopsis>
  <para>
   获取由 <parameter>filename</parameter> 指定的文件的统计信息。如果
   <parameter>filename</parameter>
   是符号连接，则统计信息是关于被连接文件本身的，而不是符号连接。在 PHP 7.4.0
   之前，使用 Windows <abbrev>NTS</abbrev> 版本获取
   <literal>size</literal>、<literal>atime</literal>、<literal>mtime</literal>
   和 <literal>ctime</literal> 统计信息将从符号链接获取。
  </para>
  <para>
   <function>lstat</function> 和 <function>stat</function> 相同，只除了它会返回符号连接的状态。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       文件的路径。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   <table>
    <title><function>stat</function> 和 <function>fstat</function> 返回格式</title>
    <tgroup cols="3">
     <thead>
      <row>
       <entry>数字下标</entry>
       <entry>关联键名</entry>
       <entry>说明</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>0</entry>
       <entry>dev</entry>
       <entry>设备号 ***</entry>
      </row>
      <row>
       <entry>1</entry>
       <entry>ino</entry>
       <entry>inode 号 ****</entry>
      </row>
      <row>
       <entry>2</entry>
       <entry>mode</entry>
       <entry>inode 保护模式 *****</entry>
      </row>
      <row>
       <entry>3</entry>
       <entry>nlink</entry>
       <entry>连接数目</entry>
      </row>
      <row>
       <entry>4</entry>
       <entry>uid</entry>
       <entry>所有者的用户 id *</entry>
      </row>
      <row>
       <entry>5</entry>
       <entry>gid</entry>
       <entry>所有者的组 id *</entry>
      </row>
      <row>
       <entry>6</entry>
       <entry>rdev</entry>
       <entry>设备类型，如果是 inode 设备的话</entry>
      </row>
      <row>
       <entry>7</entry>
       <entry>size</entry>
       <entry>文件大小的字节数</entry>
      </row>
      <row>
       <entry>8</entry>
       <entry>atime</entry>
       <entry>上次访问时间（Unix 时间戳）</entry>
      </row>
      <row>
       <entry>9</entry>
       <entry>mtime</entry>
       <entry>上次修改时间（Unix 时间戳）</entry>
      </row>
      <row>
       <entry>10</entry>
       <entry>ctime</entry>
       <entry>上次 inodb 改变时间（Unix 时间戳）</entry>
      </row>
      <row>
       <entry>11</entry>
       <entry>blksize</entry>
       <entry>文件系统 IO 的块大小 **</entry>
      </row>
      <row>
       <entry>12</entry>
       <entry>blocks</entry>
       <entry>分配的 512 字节块数 **</entry>
      </row>
     </tbody>
    </tgroup>
   </table>
  </para>
  <para>
   * Windows 下总是 <literal>0</literal>。
  </para>
  <para>
   * - 仅在支持 st_blksize 类型的系统下有效。其它系统（如 Windows）返回 <literal>-1</literal>。
  </para>
  <para>
   *** On Windows, as of PHP 7.4.0, this is the serial number of the volume that contains the file,
   which is a 64-bit <emphasis>unsigned</emphasis> integer, so may overflow.
   Previously, it was the numeric representation of the drive letter (e.g. <literal>2</literal>
   for <literal>C:</literal>) for <function>stat</function>, and <literal>0</literal> for
   <function>lstat</function>.
  </para>
  <para>
   **** 在 Windows 上，自 PHP 7.4.0 起，这是跟文件相关的标识符，因为是64位
   <emphasis>unsigned</emphasis> 整数，因此可能会溢出。之前始终为 <literal>0</literal>。
  </para>
  <para>
   ***** On Windows, the writable permission bit is set according to the read-only
   file attribute, and the same value is reported for all users, group and owner.
   The ACL is not taken into account, contrary to <function>is_writable</function>.
  </para>
  <para>
  <literal>mode</literal> 的值包含几个函数读取到的信息。当用八进制编写时，从右开始，前三位由
  <function>chmod</function> 返回。PHP 忽略下一个数字。接下来的两位数字表示文件类型：
   <table>
    <title><literal>mode</literal> 文件类型</title>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>八进制表示 <literal>mode</literal></entry>
       <entry>含义</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry><literal>0140000</literal></entry>
       <entry>socket</entry>
      </row>
      <row>
       <entry><literal>0120000</literal></entry>
       <entry>link</entry>
      </row>
      <row>
       <entry><literal>0100000</literal></entry>
       <entry>常规文件</entry>
      </row>
      <row>
       <entry><literal>0060000</literal></entry>
       <entry>块设备</entry>
      </row>
      <row>
       <entry><literal>0040000</literal></entry>
       <entry>目录</entry>
      </row>
      <row>
       <entry><literal>0020000</literal></entry>
       <entry>字符设备</entry>
      </row>
      <row>
       <entry><literal>0010000</literal></entry>
       <entry>fifo</entry>
      </row>
     </tbody>
    </tgroup>
   </table>
   例如普通文件可能是 <literal>0100644</literal>，目录可能是 <literal>0040755</literal>。
  </para>
  <para>
   如果出错，<function>stat</function> 返回 &false;。
  </para>
  &fs.file.32bit;
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   错误时会产生 <constant>E_WARNING</constant> 级别的错误。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>7.4.0</entry>
      <entry>
       On Windows, the device number is now the serial number of the volume that
       contains the file, and the inode number is the identifier associated with the file.
      </entry>
     </row>
     <row>
      <entry>7.4.0</entry>
      <entry>
       The <literal>size</literal>, <literal>atime</literal>, <literal>mtime</literal> and
       <literal>ctime</literal> statistics of symlinks are always those of the target.
       This was previously not the case for <abbrev>NTS</abbrev> builds on Windows.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>stat</function> 例子</title>
    <programlisting role="php">
<![CDATA[
<?php
/* Get file stat */
$stat = stat('C:\php\php.exe');

/*
 * Print file access time, this is the same 
 * as calling fileatime()
 */
echo 'Access time: ' . $stat['atime'];

/*
 * Print file modification time, this is the 
 * same as calling filemtime()
 */
echo 'Modification time: ' . $stat['mtime'];

/* Print the device number */
echo 'Device number: ' . $stat['dev'];
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Using <function>stat</function> information together with <function>touch</function></title>
    <programlisting role="php">
<![CDATA[
<?php
/* Get file stat */
$stat = stat('C:\php\php.exe');

/* Did we failed to get stat information? */
if (!$stat) {
    echo 'stat() call failed...';
} else {
    /*
     * We want the access time to be 1 week 
     * after the current access time.
     */
    $atime = $stat['atime'] + 604800;

    /* Touch the file */
    if (!touch('some_file.txt', time(), $atime)) {
        echo 'Failed to touch file...';
    } else {
        echo 'touch() returned success...';
    }
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &note.filesystem-time-res;
  &note.clearstatcache;
  &tip.fopen-wrapper.stat;
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>lstat</function></member>
    <member><function>fstat</function></member>
    <member><function>filemtime</function></member>
    <member><function>filegroup</function></member>
    <member><classname>SplFileInfo</classname></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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