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A brief introduction to the principle of php file upload

怪我咯
Release: 2023-03-12 17:40:01
Original
2370 people have browsed it

PHP file uploadThe principle is simply analyzed. Friends who learn PHP can refer to it. It is indeed much simpler than asp.

//Form uploads can only use the multipart/form-data encoding format
$_FILES system Function ;
$_FILES['myFile']['name'] file Name
$_FILES['myFile']['type']The type of file, restricted by the server
image/**
image/x-png
application/x-zip-compressed
$_FILES['myFile']['size']Upload file size
$_FILES['myFile']['tmp_name']Save the temporary file name after uploading to the service
$_FILES['myFile'][ 'error'] Error code;
0 Success 1 Exceeds the php.ini size 2 Exceeds the value specified by the MAX_FILE_SIZE option
3 Only partially uploaded 5 The uploaded file size is 0

move_uploaded_file(temporary file, target location and file name);
Function to move the file to the target location after uploading
is_uploaded_file(MIME);
Function to determine the uploaded MIME type of the file

The code is as follows:

<form enctyoe="multipart/form-data" method="post" name="upload"> 
<input name="upfile" name="name"> 
</form> 
if(is_uploaded_file($_FILES[&#39;myFile&#39;][&#39;tmp_name&#39;])){ 
$upfile = $_FILES[&#39;upload&#39;]; 
$name = $upfile[&#39;name&#39;]; 
$type = $upfile[&#39;type&#39;]; 
$size = $upfile[&#39;size&#39;]; 
$tmp_name = $upfile[&#39;tmp_name&#39;]; 
$error = $upfile[&#39;error&#39;]; 
switch($type){ 
case &#39;image/pjpeg&#39; : $ok=1; 
break 
} 
if($ok){ 
move_uploaded_file($tmp_name,&#39;up/&#39;.$name); 
}else{ 
echo "文件类型不允许"; 
} 
}
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