CodeIgniter4/libraries/files.html
2025-02-07 17:48:15 +00:00

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<section id="working-with-files">
<h1>Working with Files<a class="headerlink" href="#working-with-files" title="Permalink to this heading"></a></h1>
<p>CodeIgniter provides a File class that wraps the <a class="reference external" href="https://www.php.net/manual/en/class.splfileinfo.php">SplFileInfo</a> class
and provides some additional convenience methods. This class is the base class for <a class="reference internal" href="uploaded_files.html"><span class="doc">uploaded files</span></a>
and <a class="reference internal" href="images.html"><span class="doc">images</span></a>.</p>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#getting-a-file-instance" id="id1">Getting a File instance</a></p></li>
<li><p><a class="reference internal" href="#taking-advantage-of-spl" id="id2">Taking Advantage of Spl</a></p></li>
<li><p><a class="reference internal" href="#new-features" id="id3">New Features</a></p>
<ul>
<li><p><a class="reference internal" href="#getrandomname" id="id4">getRandomName()</a></p></li>
<li><p><a class="reference internal" href="#getsize" id="id5">getSize()</a></p></li>
<li><p><a class="reference internal" href="#getsizebyunit" id="id6">getSizeByUnit()</a></p></li>
<li><p><a class="reference internal" href="#getsizebybinaryunit" id="id7">getSizeByBinaryUnit()</a></p></li>
<li><p><a class="reference internal" href="#getsizebymetricunit" id="id8">getSizeByMetricUnit()</a></p></li>
<li><p><a class="reference internal" href="#getmimetype" id="id9">getMimeType()</a></p></li>
<li><p><a class="reference internal" href="#guessextension" id="id10">guessExtension()</a></p></li>
<li><p><a class="reference internal" href="#moving-files" id="id11">Moving Files</a></p></li>
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<section id="getting-a-file-instance">
<h2><a class="toc-backref" href="#id1" role="doc-backlink">Getting a File instance</a><a class="headerlink" href="#getting-a-file-instance" title="Permalink to this heading"></a></h2>
<p>You create a new File instance by passing in the path to the file in the constructor.</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$file</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">\CodeIgniter\Files\File</span><span class="p">(</span><span class="nv">$path</span><span class="p">);</span>
</pre></div>
</div>
<p>By default, the file does not need to exist. However, you can pass an additional argument of <code class="docutils literal notranslate"><span class="pre">true</span></code>
to check that the file exists and throw <code class="docutils literal notranslate"><span class="pre">FileNotFoundException()</span></code> if it does not.</p>
</section>
<section id="taking-advantage-of-spl">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">Taking Advantage of Spl</a><a class="headerlink" href="#taking-advantage-of-spl" title="Permalink to this heading"></a></h2>
<p>Once you have an instance, you have the full power of the SplFileInfo class at the ready, including:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="c1">// Get the file&#39;s basename</span>
<span class="k">echo</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getBasename</span><span class="p">();</span>
<span class="c1">// Get last modified time</span>
<span class="k">echo</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getMTime</span><span class="p">();</span>
<span class="c1">// Get the true real path</span>
<span class="k">echo</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getRealPath</span><span class="p">();</span>
<span class="c1">// Get the file permissions</span>
<span class="k">echo</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getPerms</span><span class="p">();</span>
<span class="c1">// Write CSV rows to it.</span>
<span class="k">if</span> <span class="p">(</span><span class="nv">$file</span><span class="o">-&gt;</span><span class="na">isWritable</span><span class="p">())</span> <span class="p">{</span>
<span class="nv">$csv</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">openFile</span><span class="p">(</span><span class="s1">&#39;w&#39;</span><span class="p">);</span>
<span class="k">foreach</span> <span class="p">(</span><span class="nv">$rows</span> <span class="k">as</span> <span class="nv">$row</span><span class="p">)</span> <span class="p">{</span>
<span class="nv">$csv</span><span class="o">-&gt;</span><span class="na">fputcsv</span><span class="p">(</span><span class="nv">$row</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</section>
<section id="new-features">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">New Features</a><a class="headerlink" href="#new-features" title="Permalink to this heading"></a></h2>
<p>In addition to all of the methods in the SplFileInfo class, you get some new tools.</p>
<section id="getrandomname">
<h3><a class="toc-backref" href="#id4" role="doc-backlink">getRandomName()</a><a class="headerlink" href="#getrandomname" title="Permalink to this heading"></a></h3>
<p>You can generate a cryptographically secure random filename, with the current timestamp prepended, with the <code class="docutils literal notranslate"><span class="pre">getRandomName()</span></code>
method. This is especially useful to rename files when moving it so that the filename is unguessable:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="c1">// Generates something like: 1465965676_385e33f741.jpg</span>
<span class="nv">$newName</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getRandomName</span><span class="p">();</span>
</pre></div>
</div>
</section>
<section id="getsize">
<h3><a class="toc-backref" href="#id5" role="doc-backlink">getSize()</a><a class="headerlink" href="#getsize" title="Permalink to this heading"></a></h3>
<p>Returns the size of the file in bytes:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$size</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSize</span><span class="p">();</span> <span class="c1">// 256901</span>
</pre></div>
</div>
<p>A <code class="docutils literal notranslate"><span class="pre">RuntimeException</span></code> will be thrown if the file does not exist or an error occurs.</p>
</section>
<section id="getsizebyunit">
<h3><a class="toc-backref" href="#id6" role="doc-backlink">getSizeByUnit()</a><a class="headerlink" href="#getsizebyunit" title="Permalink to this heading"></a></h3>
<div class="deprecated">
<p><span class="versionmodified deprecated">Deprecated since version 4.6.0.</span></p>
</div>
<p>Returns the size of the file default in bytes. You can pass in either <code class="docutils literal notranslate"><span class="pre">'kb'</span></code> or <code class="docutils literal notranslate"><span class="pre">'mb'</span></code> as the first parameter to get
the results in kibibytes or mebibytes, respectively:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$bytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByUnit</span><span class="p">();</span> <span class="c1">// 256901</span>
<span class="nv">$kilobytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByUnit</span><span class="p">(</span><span class="s1">&#39;kb&#39;</span><span class="p">);</span> <span class="c1">// 250.880</span>
<span class="nv">$megabytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByUnit</span><span class="p">(</span><span class="s1">&#39;mb&#39;</span><span class="p">);</span> <span class="c1">// 0.245</span>
</pre></div>
</div>
<p>A <code class="docutils literal notranslate"><span class="pre">RuntimeException</span></code> will be thrown if the file does not exist or an error occurs.</p>
</section>
<section id="getsizebybinaryunit">
<span id="file-get-size-by-binary-unit"></span><h3><a class="toc-backref" href="#id7" role="doc-backlink">getSizeByBinaryUnit()</a><a class="headerlink" href="#getsizebybinaryunit" title="Permalink to this heading"></a></h3>
<div class="versionadded">
<p><span class="versionmodified added">New in version 4.6.0.</span></p>
</div>
<p>Returns the size of the file default in bytes. You can pass in different FileSizeUnit values as the first parameter to get
the results in kibibytes, mebibytes etc. respectively. You can pass in a precision value as the second parameter to define
the amount of decimal places.</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$bytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByBinaryUnit</span><span class="p">();</span> <span class="c1">// 256901</span>
<span class="nv">$kibibytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByBinaryUnit</span><span class="p">(</span><span class="nx">FileSizeUnit</span><span class="o">::</span><span class="na">KB</span><span class="p">);</span> <span class="c1">// 250.880</span>
<span class="nv">$mebibytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByBinaryUnit</span><span class="p">(</span><span class="nx">FileSizeUnit</span><span class="o">::</span><span class="na">MB</span><span class="p">);</span> <span class="c1">// 0.245</span>
</pre></div>
</div>
<p>A <code class="docutils literal notranslate"><span class="pre">RuntimeException</span></code> will be thrown if the file does not exist or an error occurs.</p>
</section>
<section id="getsizebymetricunit">
<span id="file-get-size-by-metric-unit"></span><h3><a class="toc-backref" href="#id8" role="doc-backlink">getSizeByMetricUnit()</a><a class="headerlink" href="#getsizebymetricunit" title="Permalink to this heading"></a></h3>
<div class="versionadded">
<p><span class="versionmodified added">New in version 4.6.0.</span></p>
</div>
<p>Returns the size of the file default in bytes. You can pass in different FileSizeUnit values as the first parameter to get
the results in kilobytes, megabytes etc. respectively. You can pass in a precision value as the second parameter to define
the amount of decimal places.</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$bytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByMetricUnit</span><span class="p">();</span> <span class="c1">// 256901</span>
<span class="nv">$kilobytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByMetricUnit</span><span class="p">(</span><span class="nx">FileSizeUnit</span><span class="o">::</span><span class="na">KB</span><span class="p">);</span> <span class="c1">// 256.901</span>
<span class="nv">$megabytes</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getSizeByMetricUnit</span><span class="p">(</span><span class="nx">FileSizeUnit</span><span class="o">::</span><span class="na">MB</span><span class="p">);</span> <span class="c1">// 0.256</span>
</pre></div>
</div>
<p>A <code class="docutils literal notranslate"><span class="pre">RuntimeException</span></code> will be thrown if the file does not exist or an error occurs.</p>
</section>
<section id="getmimetype">
<h3><a class="toc-backref" href="#id9" role="doc-backlink">getMimeType()</a><a class="headerlink" href="#getmimetype" title="Permalink to this heading"></a></h3>
<p>Retrieve the media type (mime type) of the file. Uses methods that are considered as secure as possible when determining
the type of file:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$type</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getMimeType</span><span class="p">();</span>
<span class="k">echo</span> <span class="nv">$type</span><span class="p">;</span> <span class="c1">// image/png</span>
</pre></div>
</div>
</section>
<section id="guessextension">
<h3><a class="toc-backref" href="#id10" role="doc-backlink">guessExtension()</a><a class="headerlink" href="#guessextension" title="Permalink to this heading"></a></h3>
<p>Attempts to determine the file extension based on the trusted <code class="docutils literal notranslate"><span class="pre">getMimeType()</span></code> method. If the mime type is unknown,
will return null. This is often a more trusted source than simply using the extension provided by the filename. Uses
the values in <strong>app/Config/Mimes.php</strong> to determine extension:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="c1">// Returns &#39;jpg&#39; (WITHOUT the period)</span>
<span class="nv">$ext</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">guessExtension</span><span class="p">();</span>
</pre></div>
</div>
</section>
<section id="moving-files">
<h3><a class="toc-backref" href="#id11" role="doc-backlink">Moving Files</a><a class="headerlink" href="#moving-files" title="Permalink to this heading"></a></h3>
<p>Each file can be moved to its new location with the aptly named <code class="docutils literal notranslate"><span class="pre">move()</span></code> method. This takes the directory to move
the file to as the first parameter:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$file</span><span class="o">-&gt;</span><span class="na">move</span><span class="p">(</span><span class="nx">WRITEPATH</span> <span class="o">.</span> <span class="s1">&#39;uploads&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>By default, the original filename was used. You can specify a new filename by passing it as the second parameter:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$newName</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">getRandomName</span><span class="p">();</span>
<span class="nv">$file</span><span class="o">-&gt;</span><span class="na">move</span><span class="p">(</span><span class="nx">WRITEPATH</span> <span class="o">.</span> <span class="s1">&#39;uploads&#39;</span><span class="p">,</span> <span class="nv">$newName</span><span class="p">);</span>
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">move()</span></code> method returns a new File instance that for the relocated file, so you must capture the result if the
resulting location is needed:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$file</span> <span class="o">=</span> <span class="nv">$file</span><span class="o">-&gt;</span><span class="na">move</span><span class="p">(</span><span class="nx">WRITEPATH</span> <span class="o">.</span> <span class="s1">&#39;uploads&#39;</span><span class="p">);</span>
</pre></div>
</div>
</section>
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