How are input fields values passed to php - php

Question

I have a database and a login form and want to write a php script that validates the login.
How are the types' data access and used?
For example, how do I access the input entered from the user in these elements.
<p><input type="text" name="login" value="" placeholder="Username or Email"></p>
<p><input type="password" name="password" value="" placeholder="Password"></p>
I want to use the login and password for validation. How can these be passed to a php script?
EDIT: I set the action to
<form method="post" action="loginVerification.php">
and when I enter the fields and submit the values, my OS wants to save the loginVerification.php. When I save it I dont get the echo.
I have this in the php file
<?php
echo $_POST['login'];
echo $_POST['password'];
How do I write the logs to a file in php, or is there a way to do runtime verification for php?
Edit 2:
<div class="container">
<section class="login">
<h1>Login</h1>
<form method="post" action="loginVerification.php">
<p><input type="text" name="login" value="" placeholder="Username or Email"></p>
<p><input type="password" name="password" value="" placeholder="Password"></p>
<p class="remember_me">
<label>
<input type="checkbox" name="remember_me" id="remember_me">
Remember me on this computer
</label>
</p>
<p class="submit"><input type="submit" name="commit" value="Login"></p>
</form>
</section>
<section class="login-help">
<p>Lost password? Click here to reset it.</p>
</section>

Answer 1

If your form method is post, these variables would be accessible through $_POST['login'] and $_POST['password'].

Answer 2

These fields should be part of a <form> element, such as the following:
<form method="POST" action="process.php">
<!-- input elements here -->
<input type="submit" />
</form>
Submitting the form will pass your data to your action location. In this case, to a script on the server called "process.php". Assuming your method is POST, from within process.php you could access your input fields via the $_POST global array:
<?php
// Show value of <input type="text" name="foo" />
echo $_POST['foo'];
?>

Answer 3

There are two ways to get the data from HTML forms :
POST
HTML form tag :
<form method="post" action="some.php">
<input type="text" name="username" size="20"/>
<input type="password" name="password" size="20"/>
</form>
To access the values of fiedls in some.php you can use the $_POST super global.
eg: $_POST['username']
GET
HTML form tag :
<form method="get" action="some.php">
<input type="text" name="username" size="20"/>
<input type="password" name="password" size="20"/>
</form>
To access the values of fiedls in some.php you can use the $_GET super global.
eg: $_GET['username']
Now to create a login system you need to create a database of username and password :
username | password
----------------------
abc | passcode!##
xyz | passco#$%^^
For signing-in you can use session to keep the user logged in across several pages (web application). In the login script check whether the user is valid by looking into the table and set some value for a session's variable using the $_SESSION super global. You can access that variable in any page of your web application, for that the session needs to be started in every page using :
session_start()
function. On each and every page, the session's variable must be checked for its value, if it is valid show the page else land the user to the login page.
Here you can find information on sessions : http://php.net/manual/en/ref.session.php

Answer 4

Form input values are passed via POST typically. From your PHP, you access those values using the $_POST superglobal like this:
$login = $_POST['login'];
$password = $_POST['password'];
The array key in the $_POST array is what you set name to in your HTML element like name="login".
When using this value, be aware that it comes straight from your user and should not be trusted. If you don't filter it prior to using it with database operations, you run the very real risk of becoming a victim of SQL injection leading to your site being compromised.

Answer 5

in your php file try this
echo $_REQUEST['login'];
echo $_REQUEST['password'];