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  1. PO
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    <p>you use codeigniter's file uploader class... and call <code>$this-&gt;upload-&gt;do_upload();</code> in a conditional statement ahd check if its true.</p> <pre><code>&lt;?php if ( ! $this-&gt;upload-&gt;do_upload()){ $error = array('error' =&gt; $this-&gt;upload-&gt;display_errors()); $this-&gt;load-&gt;view('upload_form', $error); } else{ $data = array('upload_data' =&gt; $this-&gt;upload-&gt;data()); $this-&gt;load-&gt;view('upload_success', $data); } </code></pre> <p><strong>The user_guide explains this in detail:</strong> <a href="http://codeigniter.com/user_guide/libraries/file_uploading.html" rel="nofollow noreferrer">http://codeigniter.com/user_guide/libraries/file_uploading.html</a></p> <p>However, if you are dead set on checking whether a file has been "uploaded" aka.. submitted BEFORE you call this class (not sure why you would). You can access PHPs <code>$_FILES</code> super global.. and use a conditional to check if size is > 0.</p> <p><a href="http://www.php.net/manual/en/reserved.variables.files.php" rel="nofollow noreferrer">http://www.php.net/manual/en/reserved.variables.files.php</a></p> <p><strong>Update 2:</strong> This is actual working code, i use it on an avatar uploader myself using CI 2.1</p> <pre><code>&lt;?php //Just in case you decide to use multiple file uploads for some reason.. //if not, take the code within the foreach statement foreach($_FILES as $files =&gt; $filesValue){ if (!empty($filesValue['name'])){ if ( ! $this-&gt;upload-&gt;do_upload()){ $error = array('error' =&gt; $this-&gt;upload-&gt;display_errors()); $this-&gt;load-&gt;view('upload_form', $error); }else{ $data = array('upload_data' =&gt; $this-&gt;upload-&gt;data()); $this-&gt;load-&gt;view('upload_success', $data); } }//nothing chosen, dont run. }//end foreach </code></pre>
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    1. POCheck if a file is going to be uploaded? CodeIgniter
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    1. USAlberto Carrasco García
    1. USgorelative
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    1. COOkay, but what if the field is left empty? Errors would appear, but I want to do_upload() only if the field is not empty (that means the user tries to upload an avatar for their profile?
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      1. USIvanka Todorova
    2. COsee my edited answer. Use a conditional $_FILES if/else statement.
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    3. COThanks. I did this: `$avatar = $_FILES['userfile']['name']; if(!empty($avatar)) { //upload file }`
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      1. USIvanka Todorova
 

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