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PHP multiple file upload analysis_PHP tutorial

WBOYOriginal: 2016-07-20 11:05:57835browse

Summary of personal understanding of

PHP multi-file upload

Multiple file upload is a basic application in PHP. I would like to introduce the relevant knowledge to you in detail. My level is limited, so please give me more opinions. Let’s make progress together.
You should add [] after the name in the FILE type of the input tag of the uploaded file HTML. The function is to create an array in the HTML to PHP. For example, the name is pictures, and the name of the multiple file reference is pictures[]. The example is as follows:

<code id="code0"><br><font face="仿宋_GB2312"><form action="upload.php" method="post" enctype="multipart/form-data"><br><p><br><input type="file" name="pictures[]" /><br /><br><input type="file" name="pictures[]" /><br /><br><input type="file" name="pictures[]" /><br /><br><input type="submit" value="上传" /><br></p><br></form> //手册中实例。</font>

< ;br />

//Examples in the manual. The method manual for using HTML files to create arrays explains this:

To make your

result be sent to the PHP script as an array, you need to set the or

The unit is named like this: <input name="MyArray[]" /><br /> <br /><br /><br /> You can group cells into different arrays by assigning them the same name: <br /> input name="MyArray[]" /><br>                                                          arrays, MyArray and MyOtherArray, and sent to the PHP script. <br><br><br> You can also assign a specified key name to the array: <br> ;<br>                <input name="AnotherArray[email]" /><br>                                                                                                                                                                                                    phone. <br><br> Note: Specifying array key names is optional in HTML. If you do not specify a key name, the array is filled in the order in which the cells appear in the form. The first example will contain the keys 0, 1, 2, 3. <br><br><br> After clicking to upload the above HTML, it will be read through the $_FILES super global variable. $_FILES will combine the file information passed up by the HTTP POST method into an array. The form of a file array is two-dimensional. The array form of more than two files is three-dimensional. <br><br><br> How to use $_FILES: <br>$_FILES['userfile']['name'] <br>The original name of the client machine file. <br>$_FILES['userfile']['type'] The MIME type of the file, if the browser provides this information. An example is "<br>image/gif<em>". However, this MIME type is not checked on the PHP side, so don't take it for granted. </em>$_FILES['userfile']['size'] The size of the uploaded file, in bytes. <br>$_FILES['userfile']['tmp_name'] The temporary file name stored on the server after the file is uploaded. <br>$_FILES['userfile']['error'] <br><br><br> The following is a file upload. After this file is uploaded, its information will be generated in the $_FILES array. Because it is a file, it is Two-dimensional, in order to facilitate everyone's understanding, we will use PRINT_R to output $_FILES to view its structure. <br><br>HTML file: <br> <h5></h5>
<code id="code1"><br><form action="upload.php" method="post" enctype="multipart/form-data"> <font face="仿宋_GB2312"><p><br><input type="file" name="pictures" /><br /><br><input type="submit" value="Upload" /><br></p><br>> >print_r($_FILES);</font>?></code><h5>Save it as UPLOAD.PHP, run the above HTML to select a file to upload, for example, the file name is Thumbs.db, in IE browser Click View, Source Code. The display is as follows: </h5>Array<code id="code2"><font face="仿宋_GB2312">          <br><?php<br />print_r($_FILES);<br />?></font></code>(<br> [pictures] =>                                                                                                                                                                                                 //Original file name<br>                                   Application/OCTET-Stream // File type <br> [tmp_name] = & gt; d: Easyphptmphp64.tmp // Temporary storage directory and file name <br> [error] = & gt; 0 // Error code 0 is successful upload <br> [size] => 23040 Based on this information, combined with the usage of $_FILES above, everyone should be able to understand it more deeply. <br><br><br>Let’s take a look at the multi-file upload. The three file names are FILE1.TXT, FILE2.TXT, FILE3.TXT, and then use PRINT_R output to view its structure: <br><br>HTML file Code: <br> <br><code id="code3"><br><font face="imitating Song_GB2312"><form action="upload.php" method="post" enctype="multipart/form -data"><br><p><br><input type="file" name="pictures[]" /><br /><br><input type="file" name="pictures[]" /><br /><h5><input type="file" name="pictures[]" /><br /></h5><input type ="submit" value="Upload" /><code id="code3"><br><font face="仿宋_GB2312"><form action="upload.php" method="post" enctype="multipart/form-data"><br><p><br><input type="file" name="pictures[]" /><br /><br><input type="file" name="pictures[]" /><br /><br><input type="file" name="pictures[]" /><br /><br><input type="submit" value="上传" /><br></p><br></form></font></code></p><h5></form></h5>
<code id="code4"><font face="仿宋_GB2312">          <br><?php<br />print_r($_FILES);<br />?></font></code>PHP receiving file code: <br> <br><code id=" code4"><font face="imitation Song_GB2312"> <br><?php<br />print_r($_FILES);<br />?><br><br>View source file: <br><br>Array<br>(<br> [pictures] => Array<br> [name] => Array<br> (<br> 0] => file1.txt<br>                                              1] => file2.txt<br>                                                                                                       (<br>                                                                                                                                          -stream<br>                                                                                        [tmp_name] => Array<br>(<br>                                                                                    [2] => D:EasyPHPtmpphp49.tmp<br>             )<br> [error] => Array<br>                                                                                                                 [2] => 0<br> )<br> [size ] => Array<br>                                                                                                                                                                                                                                                                  )<br> Assuming files named /file1.txt and /file2.txt are submitted, the value of $_FILES['pictures']['name'][0] will be file1.txt, and $_FILES[' The value of pictures']['name'][1] will be file2.txt. Similarly, $_FILES['file2.txt']['size'][0] will contain the size of the file file1.txt, and so on.	<br>
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