Day 10 - Let's Eat Cookie - Become PHP Expert in 30 days

[melbin]

http://php.flashwebhost.com/melbin/set_cookie.php

<?php

if (isset($_COOKIE['VisitorName'])) {
    echo 'Hi ' . $_COOKIE['VisitorName'];
    exit;
}

if (isset($_POST['VisitorName']) && strlen($_POST['VisitorName']) > 3) {
    setcookie('VisitorName', $_POST['VisitorName'], time() + (86400 * 7)); // Remember 1 week
    echo 'Cookie Set. Close the browser. Revisit this page, I will remember your name for 1 week';
} else {

    echo '
        What is your name ?
        <form method="post" action="">
        <input type="text" name="VisitorName">
        <button type="submit" name="Submit">Remember Me</button>
        </form>
    ';
}

I am getting the following warning message

Warning: Cannot modify header information - headers already sent by (output started at /home/fwhphp/public_html/melbin/set_cookie.php:1) in /home/fwhphp/public_html/melbin/set_cookie.php on line 9

Why ??

[admin]

Remove empty line from line number 1.

setcookie() function should be called before outputting any text to browser.

[sherlyk]

http://php.flashwebhost.com/sherly/cookies.php

<?php

if (isset($_COOKIE['bakery_visitor'])) {
    echo $_COOKIE['bakery_visitor'] . ', Welcome to Himalaya Bakery, eat some $_COOKIE';
    exit;
}

if (isset($_POST['bakery_visitor']) && strlen($_POST['bakery_visitor']) > 5) {
    // time()+2800 = 2 hour, that is cookie will remember your name for 2 hour.
    // time() is a PHP function, that return current time in numric format.
    // 2800 == number of seconds in 2 hour.
    // So to remember 4 hour, use time() + 2800 * 4
    setcookie('bakery_visitor', $_POST['bakery_visitor'], time()+2800);
    echo 'Cookie Set. Close the browser. Revisit this page, I will remember your name';
} else {

    echo '
        What is your name ?
        <form method="post" action="">
        <input type="text" name="bakery_visitor">
        <button type="submit" name="whatever">Enter your name</button>
        </form>
    ';
}

[admin]

http://php.flashwebhost.com/sherly/cookies.php

<?php

if (isset($_COOKIE['bakery_visitor'])) {
    echo $_COOKIE['bakery_visitor'] . ', Welcome to Himalaya Bakery, eat some $_COOKIE';
    exit;
}

if (isset($_POST['bakery_visitor']) && strlen($_POST['bakery_visitor']) > 5) {
    // time()+2800 = 2 hour, that is cookie will remember your name for 2 hour.
    // time() is a PHP function, that return current time in numric format.
    // 3600 == number of seconds in 2 hour.
    // So to remember 4 hour, use time() + 2800 * 4
    setcookie('bakery_visitor', $_POST['bakery_visitor'], time()+2800);
    echo 'Cookie Set. Close the browser. Revisit this page, I will remember your name';
} else {

    echo '
        What is your name ?
        <form method="post" action="">
        <input type="text" name="bakery_visitor">
        <button type="submit" name="whatever">Enter your name</button>
        </form>
    ';
}

Good, working perfectly.

[annie]

http://php.flashwebhost.com/annie/cookie.php

<?php
if (isset($_COOKIE['visitor_name'])) {
echo $_COOKIE['visitor_name'] . ', Welcome to Meritnation';
exit;
}

if (isset($_POST['visitor_name']) && strlen($_POST['visitor_name']) > 3) {
setcookie('visitor_name',$_POST['visitor_name'], time() + 18000);
echo 'Cookie Set. Close the browser. Revisit this page, I will remember your name';
} else {
 echo '
        What is your name ?
        <form method="post" action="">
        <input type="text" name="visitor_name">
        <button type="submit" name="submit">Enter Web Site</button>
        </form>
    ';
}

[admin]

http://php.flashwebhost.com/annie/cookie.php

<?php
if (isset($_COOKIE['visitor_name'])) {
echo $_COOKIE['visitor_name'] . ', Welcome to Meritnation';
exit;
}

if (isset($_POST['visitor_name']) && strlen($_POST['visitor_name']) > 3) {
setcookie('visitor_name',$_POST['visitor_name'], time() + 18000);
echo 'Cookie Set. Close the browser. Revisit this page, I will remember your name';
} else {
 echo '
        What is your name ?
        <form method="post" action="">
        <input type="text" name="visitor_name">
        <button type="submit" name="submit">Enter Web Site</button>
        </form>
    ';
}

Nice script, working properly.

[Vahaa11]

Do we need to use _ ( Underscore ) if our variable have three words ?
php_expert_name

Before we used like

secretNumber
userNumber
cowsCanFly

Any difference between these two variable type?

[admin]

Do we need to use _ ( Underscore ) if our variable have three words ?
php_expert_name

Before we used like

secretNumber
userNumber
cowsCanFly

Any difference between these two variable type?

It is better we follow one type of coding style. So far PHP had no coding guidelines like many other programming languages. So we used whatever we like, but when working on a team, it is better we follow same coding conventions. In vShare, we use $video_info, $user_name etc.. At that time no such coding guidelines where present and we follow that rule in out code.

Now PHP have a coding style

http://www.php-fig.org/psr/psr-2/

This coding style is supported by many large projects as you can see on home page of that site

http://www.php-fig.org/

Laravel, Zend Framework 2, Symfony2, Joomla, Drupal, eZ Publish, phpBB, Doctrine, CakePHP, Composer and many more. This list include popular PHP frameworks like Zend, Symfony and Laravel.

But we can't change coding style of exisiting project in one day, there are lot of code to change, so it may take time, for newer code, it is better follow a coding style, so everyone do the same, not what each programmer like, this may it easy to read/understand code.

In the code, i used

$_COOKIE['php_expert_name']

It is better follow the PHP variable naming convention and use

$_COOKIE['phpExpertName']

I will update the script to avoid further confusion.

[stefin]

http://php.flashwebhost.com/stefin/set_cookie.php

<?php


if (isset($_COOKIE['flipkartCustomer'])) {
    echo $_COOKIE['flipkartCustomer'] . ',Welcome to flipkart, SPECIAL OFFER- 50% OFF ON ALL GAMES';
exit;
}


if (isset($_POST['flipkartCustomer']) && strlen($_POST['flipkartCustomer']) > 5) {
   setcookie('flipkartCustomer', $_POST['flipkartCustomer'], time()+3600);
   echo 'COOKIE Set. Close the browser. Revisit this page, I will remember your name';
} else {


echo'
    Enter your name ?
    <form method="post" action="">
    <input type="text" name="flipkartCustomer">
    <button type="submit" name="whatever">Enter Name</button>
  ';
}

[admin]

http://php.flashwebhost.com/stefin/set_cookie.php

<?php


if (isset($_COOKIE['flipkartCustomer'])) {
    echo $_COOKIE['flipkartCustomer'] . ',Welcome to flipkart, SPECIAL OFFER- 50% OFF ON ALL GAMES';
exit;
}


if (isset($_POST['flipkartCustomer']) && strlen($_POST['flipkartCustomer']) > 5) {
   setcookie('flipkartCustomer', $_POST['flipkartCustomer'], time()+3600);
   echo 'COOKIE Set. Close the browser. Revisit this page, I will remember your name';
} else {


echo'
    Enter your name ?
    <form method="post" action="">
    <input type="text" name="flipkartCustomer">
    <button type="submit" name="whatever">Enter Name</button>
  ';
}

Thank you for the discount.