<?php
// define $total as 10
$total = 10;
// increment it
$total++;
// $total is now 11

?>

Thus, <?php $total++; ?> is functionally equivalent to <?php
$total = $total + 1; ?>.
There’s also a corresponding auto-decrement operator (––), which does exactly the opposite:

<?php
// define $total as 10
$total = 10;
// decrement it
$total--;
// $total is now 9

?>

These operators are frequently used in loops to update the value of the loop counter.

for today i will discuss about PHP Logical Operators.

To link together related conditions in a simple and elegant manner, we can use one of PHP’s four Logical Operators -logical AND, logical OR, logical XOR, and logical NOT-as illustrated in the following listing.

<?php
// define some variables
$username = 'daniel';
$password = 'dumas';
$saveCookie = 1;
$status = 1;

// logical AND
// returns true if all conditions are true
// returns true here
$result = (($username == 'daniel') && ($password == 'dumas'));

// logical OR
// returns true if any conditions is true
// returns false here
$result = (($status < 1) || ($saveCookie == 0)); 

// logical NOT
// returns true if the condition is false and vice-versa
// returns false
$result = !($saveCookie == 1); 

// logical XOR
// returns true if any of the two conditions are true
// returns false if both conditions are true
// returns false here

$result = (($status == 1) xor ($saveCookie == 1));

?>

As a Web Developer or Web Designer, it is important that website’s we develop are working on all major browsers, or on all(old or new) browsers if possible. but some browsers (specially the old one’s) has their own specific way of translating or handling css /style directions.

And also sometimes we need to show or hide some specific elements for some browsers or browser versions.

for situations like the above, stylesheet separation for specific browsers can help.  look at the codes below.

<?php
if(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE 6")){
?>
<link rel="stylesheet" type="text/css" href="/css/ie6.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE 7")) {
?>
<link rel="stylesheet" type="text/css" href="/css/ie7.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE 8")) {
?>
<link rel="stylesheet" type="text/css" href="/css/ie8.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "Firefox")) {
?>
<link rel="stylesheet" type="text/css" href="/css/ff.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "Chrome")){
?>
<link rel="stylesheet" type="text/css" href="/css/chr.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "Safari")){
?>
<link rel="stylesheet" type="text/css" href="/css/saf.css" />
<?php
}
?>

what this codes do is detect the users browser then prints the specific stylesheet for that browser. you can put this code directly below your main CSS stylesheet, because the primary use of this code is to override the main CSS settings. so for example a div is showing differently in IE6 browser, you can just include the style direction of this div into the ie6.css, so when a user browse your website using IE6 browser, the main CSS setting for this div will be override by ie6.css.

the code above can also be used on a wordpress blog or wordpress based sites, you just need to add your wordpress site’s template url to the CSS path. please look at the code below.

<?php
if(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE 6")){
?>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/css/ie6.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE 7")) {
?>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/css/ie7.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "MSIE 8")) {
?>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/css/ie8.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "Firefox")) {
?>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/css/ff.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "Chrome")){
?>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/css/chr.css" />
<?php
} elseif(strstr($_SERVER['HTTP_USER_AGENT'], "Safari")){
?>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/css/saf.css" />
<?php
}
?>

You can insert this code into your wordpress theme’s header file (header.php), directly below the main CSS declaration:

<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); ?>" type="text/css" media="screen" />

Enjoy! please share.

To do this refer to the example below..

PHP Single Line Comment:

<?php
// Hi There I am a PHP single line comment!
?>

PHP Multi-Line comment:

<?php
/* Hello everybody I am
PHP Multi-Line Comment */
?>

consider this example on embedding your first PHP script into HTML.

<html>
<head>
<title>Hello World!</title>
</head>
<body>
<!-- This is how you print output in PHP-->

<h2><?php echo "Philippines is a beautiful country!"; ?></h2>

</body>
</html>

copy and save this to your text editor with a .php extension then run it on your localhost..

echo – is a function for printing output.

Remember: you should always end your php statement with a semicolon ( ; ) or else you will get an error, this is true if you have complex php statement, but in the example above it will work fine even if we remove the semicolon at the end of our statement because the closing tag ?> has an implicit semicolon, however it is a good programming practice to end php statement with a semicolon.

you should get this output from your browser..

Remember: White space is not important in php, so…

<html>
<head>
<title>Hello World!</title>
</head>
<body>
<!-- This is how you print output in PHP-->

<h2><?php

echo "Philippines is a beautiful country!";

?></h2>

</body>
</html>

would yield the same output as above.

if you look at the HTML source at your browser you should see something like this. .

<html>
<head>
<title>Hello World!</title>
</head>
<body>

<!- - This is how you print output in PHP- ->

<h2>Philippines is a beautiful country!</h2>

</body>
</html>

Notice that the php tags didnt show up.. it’s because the server understand our php script it processed it and just return to the browser the output which is a valid HTML.

Hello guys today i am going to start my basic PHP tutorial. i will give examples in every part of this tutorial so that you can follow with me easily. my aim in this tutorial is to share my knowledge in PHP to anyone specially to my blog readers who wants to learn the basics of PHP. i will focus on the very basic of PHP so that anyone can follow along even if you dont have any background in PHP or any other programming language before. Anyone is welcome to comment or add anything in the tutorial specially those php professional so that we can help other people dont worry i will put your name in the contributors list hehe thanks in advance.

Here’s the list of topics / contents included in the tutorial.

• Introduction
• Software Needed and Installations
• PHP scripting basics
• Data Types
• Conditionals and Looping
• Arrays and Functions
• Working with MySQL
• Working With Sessions and more…

I will update and make a separate page of all the links to the tutorial everytime i post so that you can check it out lesson by lesson or chapter by chapter. thanks.