Sharing several codes to implement file download function in PHP

Sharing several codes to implement file download function in PHP_PHP Tutorial

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Release： 2016-07-13 10:29:54

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A simple php file downloads the source code. Although it does not support breakpoint resumption, etc., it can meet some common needs. PHP downloading files can actually be achieved with an a tag, such as magento-1.8.1.0.zip. But if you encounter some formats that the browser can recognize, such as .txt, .html, .pdf, etc., then use abc.txt I guess you know what will happen. What's up.

Copy code The code is as follows:

/**
* File download
*
**/

header("Content-type:text/html;charset=utf-8");
download('web/magento-1.8.1.0.zip', 'magento download');

function download($file, $down_name){
$suffix = substr($file,strrpos($file,'.')); //Get the file suffix
$down_name = $down_name.$ suffix; //The new file name is the name after downloading

//Judge whether the given file exists
if(!file_exists($file)){
die("The file you want to download no longer exists, it may have been deleted");
}
$fp = fopen($file,"r");
$file_size = filesize($file);
//Headers needed to download files
header("Content- type: application/octet-stream");
header("Accept-Ranges: bytes");
header("Accept-Length:".$file_size);
header("Content-Disposition: attachment; filename=".$down_name);
$buffer = 1024;
$file_count = 0;
//Return data to the browser
while(!feof($fp) && $file_count < $file_size){
$file_con = fread($fp,$buffer);
$file_count += $buffer;
echo $file_con;
}
fclose($fp) ;
}

You can also take a look at this code with more detailed comments:

Copy code The code is as follows:

//File download, download a picture
//$file_name="Angel.mp3";

$file_name="bjnihao.jpg"; //The Chinese program cannot complete the download prompt: the file does not exist
//Transcode the file (the PHP file function is relatively old and needs to convert the Chinese code into gb2312)
//iconv — Convert string to requested character encoding
//by www.jb51.net
$file_name=iconv("utf-8","gb2312",$file_name);

//Set the file download path (relative path)
//$file_path="./dowm/".$file_name;

//Use absolute path
$file_path=$_SERVER['DOCUMENT_ROOT']."/http/dowm/".$file_name;

//Open the file---judge first and then operate
if(!file_exists($file_path)){

echo "The file does not exist";
return ; //Exit directly
}

//Exists--open file

$fp=fopen($file_path,"r");

//Get the file size
$file_size=filesize($file_path);

//Response header required for http download
header("Content-type: application/octet-stream"); //Returned file
header("Accept-Ranges: bytes"); // Return
header("Accept-Length: $file_size"); //Return file size according to byte size
header("Content-Disposition: attachment; filename=".$file_name); //Here the client's A dialog box pops up, corresponding file name

//Return data to the client
//Set the size output
$buffer=1024;

//For download safety, we'd better make a file byte reading counter
$file_count=0;
//Determine whether the file pointer has reached the end of the file (whether the reading of the file has ended)
while(!feof($fp) && ($file_size-$file_count)>0){

$file_data=fread($fp,$buffer);
//Count the number of bytes read
$file_count+=$buffer;
//Return part of the data to the browser
echo $file_data;
}
//Close file

fclose($fp);
?>

Packaging function:

/*
Package function:
Parameter description----$file_name: file name
$file_sub_dir: sub-path for file download
*/
function file_dowm($file_name,$file_sub_dir){
//File transcoding
$file_name=iconv("utf-8","gb2312",$file_name);

//Use absolute path
$file_path=$_SERVER['DOCUMENT_ROOT']."$file_sub_dir".$file_name;

//Open the file---judge first and then operate
if(!file_exists($file_path)){

echo "The file does not exist";
return ; //Exit directly
}

//Exists--open file

$fp=fopen($file_path,"r");

//Get the file size
$file_size=filesize($file_path);
/*
//Here You can set the maximum size that cannot be downloaded
if($file_size>50){
echo "The file is too large and cannot be downloaded";
return ;
}*/

//Return data to the client
//Set size output
$buffer=1024;

//For download safety, we'd better make a file byte reading counter
$file_count=0;
//Judge whether the file pointer has reached the end of the file (whether the reading of the file has ended)
while(!feof($fp) && ($file_size-$file_count)>0){

$file_data=fread($fp,$buffer);
//Count the number of bytes read
$file_count+=$buffer;
//Return part of the data to the browser
echo $file_data;
}

//Close the file
fclose($fp);
}

file_dowm("bjnihao.jpg","/http/dowm/");
?>

Another code:

Copy code The code is as follows:

public function downloads($name){
$name_tmp = explode("_ ",$name);
$type = $name_tmp[0];
$file_time = explode(".",$name_tmp[3]);
$file_time = $file_time[0];
$file_date = date("Y/md",$file_time);
$file_dir = SITE_PATH."/data/uploads/$type/$file_date/";

if (!file_exists( $file_dir.$name)){
header("Content-type: text/html; charset=utf-8");
echo "File not found!";
exit;
} else {
$file = fopen($file_dir.$name,"r");
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes ");
Header("Accept-Length: ".filesize($file_dir . $name));
Header("Content-Disposition: attachment; filename=".$name);
echo fread ($file, filesize($file_dir.$name));
fclose($file);
}
}