What folder is p2pcache? Simple analysis of PHP file upload principle

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

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