function.fopen.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>Opens file or URL</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.fnmatch.html">fnmatch</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.fpassthru.html">fpassthru</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.fopen" class="refentry"> <div class="refnamediv"> <h1 class="refname">fopen</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">fopen</span> — <span class="dc-title">Opens file or URL</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>fopen</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$filename</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$mode</tt></span> [, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$use_include_path</tt></span> [, <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$context</tt></span> ]] )</div> <p class="para rdfs-comment"> <b>fopen()</b> binds a named resource, specified by <i><tt class="parameter">filename</tt></i>, to a stream. </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"> If <i><tt class="parameter">filename</tt></i> is of the form "scheme://...", it is assumed to be a URL and PHP will search for a protocol handler (also known as a wrapper) for that scheme. If no wrappers for that protocol are registered, PHP will emit a notice to help you track potential problems in your script and then continue as though <i><tt class="parameter">filename</tt></i> specifies a regular file. </p> <p class="para"> If PHP has decided that <i><tt class="parameter">filename</tt></i> specifies a local file, then it will try to open a stream on that file. The file must be accessible to PHP, so you need to ensure that the file access permissions allow this access. If you have enabled <a href="features.safe-mode.html#ini.safe-mode" class="link">safe mode</a>, or <a href="features.safe-mode.html#ini.open-basedir" class="link">open_basedir</a> further restrictions may apply. </p> <p class="para"> If PHP has decided that <i><tt class="parameter">filename</tt></i> specifies a registered protocol, and that protocol is registered as a network URL, PHP will check to make sure that <a href="filesystem.configuration.html#ini.allow-url-fopen" class="link">allow_url_fopen</a> is enabled. If it is switched off, PHP will emit a warning and the fopen call will fail. </p> <blockquote><p><b class="note">Note</b>: The list of supported protocols can be found in <a href="wrappers.html" class="xref">List of Supported Protocols/Wrappers</a>. Some protocols (also referred to as <i>wrappers</i>) support <i>context</i> and/or <var class="filename">php.ini</var> options. Refer to the specific page for the protocol in use for a list of options which can be set. (e.g. <var class="filename">php.ini</var> value <i>user_agent</i> used by the <i>http</i> wrapper). <br /> </p></blockquote> <p class="para"> On the Windows platform, be careful to escape any backslashes used in the path to the file, or use forward slashes. <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$handle </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">"c:\\data\\info.txt"</span><span style="color: #007700">, </span><span style="color: #DD0000">"r"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">mode</tt></i></span> <dd> <p class="para"> The <i><tt class="parameter">mode</tt></i> parameter specifies the type of access you require to the stream. It may be any of the following: <table border="5"> <caption><b> A list of possible modes for <b>fopen()</b> using <i><tt class="parameter">mode</tt></i> </b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1"><i><tt class="parameter">mode</tt></i></th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'r'</i></td> <td colspan="1" rowspan="1" align="left"> Open for reading only; place the file pointer at the beginning of the file. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'r+'</i></td> <td colspan="1" rowspan="1" align="left"> Open for reading and writing; place the file pointer at the beginning of the file. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'w'</i></td> <td colspan="1" rowspan="1" align="left"> Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'w+'</i></td> <td colspan="1" rowspan="1" align="left"> Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'a'</i></td> <td colspan="1" rowspan="1" align="left"> Open for writing only; place the file pointer at the end of the file. If the file does not exist, attempt to create it. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'a+'</i></td> <td colspan="1" rowspan="1" align="left"> Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'x'</i></td> <td colspan="1" rowspan="1" align="left"> Create and open for writing only; place the file pointer at the beginning of the file. If the file already exists, the <b>fopen()</b> call will fail by returning <b><tt>FALSE</tt></b> and generating an error of level <b><tt>E_WARNING</tt></b>. If the file does not exist, attempt to create it. This is equivalent to specifying <i>O_EXCL|O_CREAT</i> flags for the underlying <i>open(2)</i> system call. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>'x+'</i></td> <td colspan="1" rowspan="1" align="left"> Create and open for reading and writing; place the file pointer at the beginning of the file. If the file already exists, the <b>fopen()</b> call will fail by returning <b><tt>FALSE</tt></b> and generating an error of level <b><tt>E_WARNING</tt></b>. If the file does not exist, attempt to create it. This is equivalent to specifying <i>O_EXCL|O_CREAT</i> flags for the underlying <i>open(2)</i> system call. </td> </tr> </tbody> </colgroup> </table> </p> <blockquote><p><b class="note">Note</b>: Different operating system families have different line-ending conventions. When you write a text file and want to insert a line break, you need to use the correct line-ending character(s) for your⌨️ 快捷键说明
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