function.chmod.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Changes file mode</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.chgrp.html">chgrp</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.chown.html">chown</a></div> <div class="up"><a href="ref.filesystem.html">Filesystem Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.chmod" class="refentry"> <div class="refnamediv"> <h1 class="refname">chmod</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">chmod</span> — <span class="dc-title">Changes file mode</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>chmod</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$filename</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$mode</tt></span> )</div> <p class="para rdfs-comment"> Attempts to change the mode of the specified file to that given in <i><tt class="parameter">mode</tt></i>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">filename</tt></i></span> <dd> <p class="para"> Path to the file. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">mode</tt></i></span> <dd> <p class="para"> Note that <i><tt class="parameter">mode</tt></i> is not automatically assumed to be an octal value, so strings (such as "g+w") will not work properly. To ensure the expected operation, you need to prefix <i><tt class="parameter">mode</tt></i> with a zero (0): </p> <p class="para"> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">755</span><span style="color: #007700">); </span><span style="color: #FF8000">// decimal; probably incorrect<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #DD0000">"u+rwx,go+rx"</span><span style="color: #007700">); </span><span style="color: #FF8000">// string; incorrect<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0755</span><span style="color: #007700">); </span><span style="color: #FF8000">// octal; correct value of mode<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> The <i><tt class="parameter">mode</tt></i> parameter consists of three octal number components specifying access restrictions for the owner, the user group in which the owner is in, and to everybody else in this order. One component can be computed by adding up the needed permissions for that target user base. Number 1 means that you grant execute rights, number 2 means that you make the file writeable, number 4 means that you make the file readable. Add up these numbers to specify needed rights. You can also read more about modes on Unix systems with 'man 1 chmod' and 'man 2 chmod'. </p> <p class="para"> <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Read and write for owner, nothing for everybody else<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0600</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Read and write for owner, read for everybody else<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0644</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Everything for owner, read and execute for others<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0755</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Everything for owner, read and execute for owner's group<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0750</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: The current user is the user under which PHP runs. It is probably not the same user you use for normal shell or FTP access. The mode can be changed only by user who owns the file on most systems. <br /> </p></blockquote> <blockquote><p><b class="note">Note</b>: <span class="simpara">This function will not work on <a href="features.remote-files.html" class="link">remote files</a> as the file tobe examined must be accessible via the server's filesystem.</span></p></blockquote> <blockquote><p><b class="note">Note</b>: When <a href="features.safe-mode.html#ini.safe-mode" class="link">safe mode</a> is enabled, PHP checks whether the files or directories you are about to operate on have the same UID (owner) as the script that is being executed. In addition, you cannot set the SUID, SGID and sticky bits. <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.chown.html" class="function" rel="rdfs-seeAlso">chown()</a></li> <li class="member"><a href="function.chgrp.html" class="function" rel="rdfs-seeAlso">chgrp()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.chgrp.html">chgrp</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.chown.html">chown</a></div> <div class="up"><a href="ref.filesystem.html">Filesystem Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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