📄 function.umask.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 the current umask</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.touch.html">touch</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.unlink.html">unlink</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.umask" class="refentry"> <div class="refnamediv"> <h1 class="refname">umask</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">umask</span> — <span class="dc-title">Changes the current umask</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>umask</b></b></span> ([ <span class="methodparam"><span class="type">int</span> <tt class="parameter">$mask</tt></span> ] )</div> <p class="para rdfs-comment"> <b>umask()</b> sets PHP's umask to <i><tt class="parameter">mask</tt></i> & 0777 and returns the old umask. When PHP is being used as a server module, the umask is restored when each request is finished. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">mask</tt></i></span> <dd> <p class="para"> The new umask. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>umask()</b> without arguments simply returns the current umask otherwise the old umask is returned. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>umask()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$old </span><span style="color: #007700">= </span><span style="color: #0000BB">umask</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/path/some_dir/some_file.txt"</span><span style="color: #007700">, </span><span style="color: #0000BB">0755</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">umask</span><span style="color: #007700">(</span><span style="color: #0000BB">$old</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Checking<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">$old </span><span style="color: #007700">!= </span><span style="color: #0000BB">umask</span><span style="color: #007700">()) {<br /> die(</span><span style="color: #DD0000">'An error occured while changing back the umask'</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: Avoid using this function in multithreaded webservers. It is better to change the file permissions with <a href="function.chmod.html" class="function">chmod()</a> after creating the file. Using <b>umask()</b> can lead to unexpected behavior of concurrently running scripts and the webserver itself because they all use the same umask. <br /> </p></blockquote> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.touch.html">touch</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.unlink.html">unlink</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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