A PHP script can be used with a HTML form to allow users to upload files to the server

fopen ( ) is a system function available in PHP.

Syntax:
\($\)file_Object = fopen("FileName", "Read/WriteMode") or die("Error Message!");

File handling is an important activity of all web application development process.

Validation is a process of checking the input data submitted by the user from client machine.

PHP write a File:
The fwrite( ) function is used to write to a file.
Syntax:
fwrite(＄myfile, ＄txt);
Example:
< ?php
＄myfile = fopen("new_schooLfile.
txt", "w'')
or die("Unable to open file!'');
＄txt = "School Name\n";
fwrite(＄myfile, ＄txt);
＄txt = "Student Name\n";
fwrite(＄myfile, ＄txt);
fclose(＄myfile);
? >

PHP Open a File
1. fopen( ) is a system function available in PHP.
2. This function helps to open a file in the server.
3. It contains two parameters one for the file and the other one specifies in which mode the file should be opened (Read/Write).
Syntax:
＄file_Object= . fopen("FileName", "Read/ WriteMode'') or die("Error Message!'');
Example:
< ?php
＄myfile = fopen("Student.txt", "r'') or die("Unable to open file!'');
? >

i) Text(Notepad) file:
AJAX = Asynchronous JavaScript and XML
CSS = Cascading Style Sheets
HTML = Hyper Text Markup Language
PHP = PHP Hypertext: Preprocessor
SQL = Structured Query Language
SVG = Scalable Vector Graphics
XML = EXtensible Markup Language
ii) PHP File:
< ?php
＄myfile = fopen("webdictionary.txt", "r'') or
die("Unable to open file!'');
echo fread( ＄myfile, filesize("webdictionary.
txt'')); fclose(＄myfile);
? >
iii) OUTPUT 
AJAX = Asynchronous JavaScript and XML
CSS = Cascading Style Sheets
HTML = Hyper Text Markup Language
PHP = PHP Hypertext Preprocessor
SQL = Structured Query Language
SVG = Scalable Vector Graphics
XML = EXtensible Markup Language

File handling is needed for any web application development process. File handling in PHP similar as file handling is done by Clanguage. PHP has many functions to work with normal files.

The GET and POST methods are used for sending the data to the server and the main difference between them is that GET methods append the data to the URI defined in form's action attribute POST methods attaches data to the requested body.

1. File upload is the best feature to select one file from the local machine to server machine.
2. Form tag is used to mention a method as POST or GET and encrypt/attribute mentioned as "multipart /form-data. In the tag mention type = "file" attribute shows the input field as a file select control with a "Browse" button next to the input control.
3. In server machine "php.ini" file search for the file uploads directive, and set it to On : "file uploads = On"
4. After submitting the upload button the request reaches to student_photo_upload.php file.
5. In the file＄_FILES variable collects all uploaded file information such as name of the file, size of the file and extension of the file etc. All the details are checked throughly and the error are saved in an array variable The file finally moves under the image directly if the array error variable is empty.
Example:
Fileupload.html:

 

The following control are available in HTML forms:
(i) Text inputs
(ii) Buttons
(iii) Checkbox
(iv) Radio box
(v) File Select
(vi) Form Tag
(i) Text inputs contain textbox and text area controls.
(ii) Buttons may contain Submit button, Reset button and Cancel Button.
(iii) Checkbox is a important feature which selects more than one value from the HTML form.
(iv) Radio box is similar to checkbox but one value can be chosen at a time.
(v) File select is the best feature to select one file from the local machine to server machine at a time.
(vi) Form tag is used to mention a method (POST or GET) and control the entire form controls in the HTML document.