creating html form explain the action method variable GET & POST. $_GET and $_POST variable of html form we can use it in php programming language. For picking up forms variable to php variable. In this example we are processing three variable in get method date, date and year. From the help of html forms we need value to pick up and processes to php and display to the user in this example.
Now in php what we need to do is firstly check few conditions
1. Does It exist? or "Has it been submitted?"
example code
if (isset($_GET['day'])&&isset($_GET['date'])&&isset($_GET['year'])) {
It will check whether user had submitted the form that will check submit value of submit button.
2. Is it empty? or "Does value == NULL"
example code
if(!empty($day)&&!empty($date)&&!empty($year))
It will check whether submitted value is empty or null value.
3. Display back to user
example code
echo 'It is '.$day.' '.$date.''.$year;
}else {
echo 'Fill in all fields.';
}
}
If both condition will true it will output the user what the user inputted in the form values.
Now you will be thinking how does the values of form detected in php variable
example code
$day = $_GET['day'];
$date = $_GET['date'];
$year = $_GET['year'];
In this way we can save form values into the php variables. $_GET method is useful to grab the values from the form to the php variables the name of the textbox field can be use to grab the values in $_GET method.
Day:<br><input type="text" name="day"> -> $day = $_GET['day'];.
The attribute name of the html form is used into the $_GET method and then it can be declare had php variables.
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Working with $_POST Variables
Post data using forms now we already seen get data using forms using post data is because for security. In $_GET variable we were displaying value of from into the url. We were showing value name of the form and its value in our url in $_GET method of the form. You can see the structure of $_GET method variables in Screenshot2 and Screenshot3. But in $_POST variable the url of the page will be the file name not the values or anything will show to the url its the only difference between $_GET and $_POST variable. The $_POST variable is used in long text area like description of anything , in registration form for password because password must not be pass to the url to show user and url had limitation some amount of text we can show in url therefore for the long description we can not use $_GET variable.
.jpg "php security")
.PNG "Working with Form data , $_GET , $_POST Variables Html Forms in Php")
