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PHP - $_POST
PHP $_POST
$_POST contains an array of variables received via the HTTP POST method.
There are two main ways to send variables via the HTTP Post method:
HTML forms
JavaScript HTTP requests
$_POST in HTML Forms
A HTML form submits information via the HTTP POST method if the form's method attribute is set to "POST".
To demonstrate this, we start by creating a simple HTML form:
HTML Form
When a user clicks the submit button, the form data is sent to a PHP file specified in the action attribute of the
$_POST in JavaScript HTTP Requests
When sending a HTTP request in JavaScript, you can specify that the HTTP method is POST.
To demonstrate this we start by creating a JavaScript function containing a HTTP request:
JavaScript function
function myfunction() {
const xhttp = new XMLHttpRequest();
xhttp.open("POST", "demo_phpfile.php");
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.onload = function() {
document.getElementById("demo").innerHTML = this.responseText;
}
xhttp.send("fname=Mary");
}
}
The code above will:
Intiate a HTTP request
Set the HTTP method to POST
Set a valid request header
Create a function to execute when the request is done
Send the HTTP request with a variable fname set to Mary
Look at the function that will be executed when the request is done:
xhttp.onload = function() {
document.getElementById("demo").innerHTML = this.responseText;
}
It will try to write a response from the operation in a HTML element with id="demo".
Let us make a HTML page with such element, and also a button that executes the function.
If we also add the the JavaScript, the page looks like this:
Example
How to post and receive data from a HTTP request: