📄 function.finfo-open.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Create a new fileinfo resource</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.finfo-file.html">finfo_file</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.finfo-set-flags.html">finfo_set_flags</a></div> <div class="up"><a href="ref.fileinfo.html">Fileinfo Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.finfo-open" class="refentry"> <div class="refnamediv"> <h1 class="refname">finfo_open</h1> <h1 class="refname">finfo->__construct</h1> <p class="verinfo">(PECL fileinfo:0.1-1.0.4)</p><p class="refpurpose"><span class="refname">finfo_open</span> -- <span class="refname">finfo->__construct</span> — <span class="dc-title">Create a new fileinfo resource</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <p class="para">Procedural style</p> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>finfo_open</b></b></span> ([ <span class="methodparam"><span class="type">int</span> <tt class="parameter">$options</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$arg</tt></span> ]] )</div> <p class="para rdfs-comment">Object oriented style (constructor):</p> <div class="classsynopsis"> <div class="ooclass"><b class="classname">finfo</b></div> <div class="constructorsynopsis dc-description"> <span class="methodname"><b><b>__construct</b></b></span> ([ <span class="methodparam"><span class="type">int</span> <tt class="parameter">$options</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$magic_file</tt></span> ]] )</div> </div> <p class="para"> This function opens a magic database and returns its resource. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">options</tt></i></span> <dd> <p class="para"> One or disjunction of more <a href="fileinfo.constants.html" class="link">Fileinfo constants</a>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">magic_file</tt></i></span> <dd> <p class="para"> Name of a magic database file, usually something like <var class="filename">/path/to/magic.mime</var>. If not specified, the <i>MAGIC</i> environment variable is used. If this variable is not set either, <var class="filename">/usr/share/misc/magic</var> is used by default. A <i>.mime</i> and/or <i>.mgc</i> suffix is added if needed. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a magic database resource on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <div class="example"> <p><b>Example #1 Object oriented style</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$finfo </span><span style="color: #007700">= new </span><span style="color: #0000BB">finfo</span><span style="color: #007700">(</span><span style="color: #0000BB">FILEINFO_MIME</span><span style="color: #007700">, </span><span style="color: #DD0000">"/usr/share/misc/magic"</span><span style="color: #007700">); </span><span style="color: #FF8000">// return mime type ala mimetype extension<br /><br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">$finfo</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Opening fileinfo database failed"</span><span style="color: #007700">;<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* get mime-type for a specific file */<br /></span><span style="color: #0000BB">$filename </span><span style="color: #007700">= </span><span style="color: #DD0000">"/usr/local/something.txt"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">file</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">$finfo</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <div class="example"> <p><b>Example #2 Procedural style</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$finfo </span><span style="color: #007700">= </span><span style="color: #0000BB">finfo_open</span><span style="color: #007700">(</span><span style="color: #0000BB">FILEINFO_MIME</span><span style="color: #007700">, </span><span style="color: #DD0000">"/usr/share/misc/magic"</span><span style="color: #007700">); </span><span style="color: #FF8000">// return mime type ala mimetype extension<br /><br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">$finfo</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Opening fileinfo database failed"</span><span style="color: #007700">;<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* get mime-type for a specific file */<br /></span><span style="color: #0000BB">$filename </span><span style="color: #007700">= </span><span style="color: #DD0000">"/usr/local/something.txt"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">finfo_file</span><span style="color: #007700">(</span><span style="color: #0000BB">$finfo</span><span style="color: #007700">, </span><span style="color: #0000BB">$filename</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">finfo_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$finfo</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <p class="para">The above example will output:</p> <div class="example-contents"><pre><div class="cdata"><pre>text/plain</pre></div> </pre></div> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.finfo-close.html" class="function" rel="rdfs-seeAlso">finfo_close()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.finfo-file.html">finfo_file</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.finfo-set-flags.html">finfo_set_flags</a></div> <div class="up"><a href="ref.fileinfo.html">Fileinfo Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -