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Tutorials Details

How to learn PHP Supper global variable

Publish by Sifur Rahaman March 18, 2021, 1:51 pm

Description:

Many more super global variable is available. Super global variable is a PHP building function. If you want to use this function any PHP page and collect the hidden user data like- IP Address, Browser Information etc. and insert this data in your database. Some important and most usable super global variable example is below:
$_REQUEST: PHP $_REQUEST is a PHP super global variable. This variable use only collect data after submitted HTML user form. When a user fill-up all input field and click the submit button then html form active the action attribute and transfer the form data as per direction, this time use this $_REQUEST super global variable.
$_POST: PHP $_POST is a PHP super global variable. This variable use only collect and display data after submitted html user form with form method = "POST". When a user fill-up all input field and click the submit button then html input field pass this field value via POST method, this time use this $_POST super global variable. Mainly $_REQUEST variable and $_POST variable working as like same.
$_GET: PHP $_GET is a PHP super global variable. This variable use only collect data after submitted html user form with form method GET. GET and POST method work is same. When a user fill-up all input field and click the submit button then html input field pass this field value via GET method, this time use this $_GET super global variable.

Source Code:

<h4>All Supper global variable</h4>

<?php

// Returns the filename of the currently executing script
    echo $_SERVER['PHP_SELF'];
    echo "<br>";

// Returns the version of the Common Gateway Interface (CGI) the server is using

echo $_SERVER['GATEWAY_INTERFACE'];
    echo "<br>";

// Returns the IP address of the host server

echo $_SERVER['SERVER_ADDR'];
    echo "<br>";

// Returns the IP address from where the user is viewing the current page

echo $_SERVER['REMOTE_ADDR'];
    echo "<br>";

// Returns the port being used on the users machine to communicate with the web server

echo $_SERVER['REMOTE_PORT'];
    echo "<br>";

// Returns the port on the server machine being used by the web server for communication (such as 80)

echo $_SERVER['SERVER_PORT'];
    echo "<br>";

// Returns the path of the current script

echo $_SERVER['SCRIPT_NAME'];
    echo "<br>";

// Returns the file system based path to the current script

echo $_SERVER['PATH_TRANSLATED'];
    echo "<br>";

// Returns the server version and virtual host name which are added to server-generated pages

echo $_SERVER['SERVER_SIGNATURE'];
    echo "<br>";

// Returns the server identification string (such as Apache/2.2.24)

echo $_SERVER['SERVER_SOFTWARE'];
    echo "<br>";

// Returns the name and revision of the information protocol (such as HTTP/1.1)

echo $_SERVER['SERVER_PROTOCOL'];
    echo "<br>";

// Returns the request method used to access the page (such as POST)

echo $_SERVER['REQUEST_METHOD'];
    echo "<br>";

// Returns the timestamp of the start of the request (such as 1377687496)

echo $_SERVER['REQUEST_TIME'];
    echo "<br>";

// Returns the name of the host server (such as www.sifurrahaman.com)

echo $_SERVER['SERVER_NAME'];
    echo "<br>";

// Returns the Host header from the current request

echo $_SERVER['HTTP_HOST'];
    echo "<br>";

// Returns the complete URL of the current page (not reliable because not all user-agents support it)

echo $_SERVER['HTTP_REFERER'];
    echo "<br>";

// Is the script queried through a secure HTTP protocol

echo $_SERVER['HTTPS'];
    echo "<br>";

// show browser informetion

echo $_SERVER['HTTP_USER_AGENT'];
    echo "<br>";

// Returns the Accept_Charset header from the current request (such as utf-8,ISO-8859-1)

echo $_SERVER['HTTP_ACCEPT_CHARSET'];
    echo "<br>";

// Returns the Accept header from the current request

echo $_SERVER['HTTP_ACCEPT'];
    echo "<br>";

// Returns the query string if the page is accessed via a query string

echo $_SERVER['QUERY_STRING'];
    echo "<br>";

// Returns the absolute pathname of the currently executing script

echo $_SERVER['SCRIPT_FILENAME'];
    echo "<br>";

// Returns the value given to the SERVER_ADMIN directive in the web server configuration file (if your script runs on a virtual host, it will be the value defined for that virtual host) (such as admin@sifurrahaman.com)

echo $_SERVER['SERVER_ADMIN'];
    echo "<br>";

// Returns the URI of the current page

echo $_SERVER['SCRIPT_URI'];
    echo "<br>";
?>

<h4>Example-1: $_SERVER Variable</h4>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
    Name: <input type="text" name="fname">
    <input type="submit" name="submit" value="Submit">
</form>

<?php
if ($_SERVER['REQUEST_METHOD'] == "POST") {
 // collect value of input field
     $name = $_REQUEST['fname'];
     if (empty($name)) {
        echo "Name is empty";
    } else {
        echo $name;
    }
}
?>
<h4>Example-2: POST Method</h4>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
    Name: <input type="text" name="fname">
    <input type="submit" name="submit" value="Submit">
</form>

<?php 
    if ($_SERVER['REQUEST_METHOD'] == 'POST') {
// collect value of input field
        
$name = $_POST['fname'];
if (empty($name)) {
        echo "Name is empty";
    } else { 
        echo $name;
     } 
}
?>

<h4>Example-3: GET Method</h4>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get">
    Subject: <input type="text" name="subject" placeholder="Subject">
    Website: <input type="text" name="website" placeholder="sifurrahaman.com">
    <input type="submit" name="submit" value="Submit">
</form>

<?php 
   echo "Study" .$_GET['subject'] . "at" .$_GET['website'];

Sifur Rahaman

Tutorials Details

How to learn PHP Supper global variable

Description:

Source Code:

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