Upload/Download
How to upload file on the server ?

First create html form for file upload on the server.

Code

<form action=\"\" method=\"post\" enctype=\"multipart/form-data\">
Filename:<input type=\"file\" name=\"userfile\" /><br />
<input type=\"submit\" name=\"submit\" value=\"Submit\" />
</form>

Note:- enctype=\"multipart/form-data\" attribute is necessary.

File upload on server side

When we submit the form. Then $_FILES superglobal variable is created.

Suppose we submitting file : \"c:\\files\\sunset.jpeg\". Then following variable is available.

$_FILES[\'userfile\'][\'name\']:- The name of the file like c:\\files\\sunset.jpeg.
$_FILES[\'userfile\'][\'tmp_name\']:- The path of the file in the temporary directory.
$_FILES[\'userfile\'][\'size\']:- The size of the file in bytes like 30000.
$_FILES[\'userfile\'][\'type\']:- The type of the file like image/jpeg for jpeg file.
$_FILES[\'userfile\'][\'error\']:- if file contain any error then this variable generate error code.

PHP Function To Upload file on server.

To upload file on the server use move_uploaded_file() function

Syntax:-
bool move_uploaded_file(string sourcefilename,string destinationfilename);

Example 1: To upload file on the server

<?php
if(isset($_POST[\'submit\']))
{
move_uploaded_file($_FILES[\"file\"][\"tmp_name\"],\"upload/\" . $_FILES[\"file\"][\"name\"]);
}
?>
<html>
<body>
<form action=\"\" method=\"post\" enctype=\"multipart/form-data\">
Filename:<input type=\"file\" name=\"file\" id=\"file\" /><br />
<input type=\"submit\" name=\"submit\" value=\"Submit\" />
</form>
</body>
</html>

Example 2:-This example is upload only jpeg and gif file.

<?php
if(isset($_POST[\'submit\']))
{
if ( ($_FILES[\"file\"][\"type\"] == \"image/gif\") || ($_FILES[\"file\"][\"type\"] == \"image/jpeg\") )
move_uploaded_file($_FILES[\"file\"][\"tmp_name\"],\"upload/\" . $_FILES[\"file\"][\"name\"]);
else
echo \"You can upload only gif and jpeg file\";
}
?>
<html>
<body>
<form action=\"\" method=\"post\" enctype=\"multipart/form-data\">
Filename:<input type=\"file\" name=\"file\" id=\"file\" /><br />
<input type=\"submit\" name=\"submit\" value=\"Submit\" />
</form>
</body>
</html>

Example 3:- By this example file size less then equal to 5MB.

<?php
if(isset($_POST[\'submit\']))
{
if ($_FILES[\"userfile\"][\"size\"] <= 1024*1024*5)
move_uploaded_file($_FILES[\"file\"][\"tmp_name\"],\"upload/\" . $_FILES[\"file\"][\"name\"]);
else
echo \"File size less then equal to 5MB\";
}
?>
<html>
<body>
<form action=\"\" method=\"post\" enctype=\"multipart/form-data\">
Filename:<input type=\"file\" name=\"file\" id=\"file\" /><br />
<input type=\"submit\" name=\"submit\" value=\"Submit\" />
</form>
</body>
</html>

How to download data from then server

For download file from server use header() function and the header function must be with Content-type and Content-Disposition.

1- header(\"Content-type:filetype\");
write Content-type like
For jpg file Content-type is image/jpeg
For pdf file Content-type is application/pdf
etc

2- header(\"Content-Disposition:attachment;filename=filename\");
write filename with path

Example 4:- PHP script to download pdf

<?php
header(\"Content-type:application/pdf\");
header(\"Content-Disposition:attachment;filename=COMPANY_PROFILE.pdf\");
?>

Example 5:- PHP script to download image

<?php
header(\"Content-type:image/jpeg\");
header(\"Content-Disposition:attachment;filename=images/img1.jpg\");
?>


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