<?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));

?>

well today I’ll share some ways on how to Search and Replace datas or texts in WordPress. this will be useful when you are transferring a wordpress blog from one domain to another or if you’ve developed a wordpress site on your localhost and you’re gonna upload it to an online server or on your own domain, of course you need to update the paths on your posts.

for example you’ve developed a wordpress site on your local machine and you installed it on http://localhost/wordpress, when you transfer the site into a live server, you need to change that path in your database for wordpress to display your blog posts or menu links correctly, and not only that – there may be times that you hardcoded a link (eg. images,post) in your blog post. i dont know for you, but for me updating it one by one is a no no.. i mean why are you gonna do it manually, when you can do it automatically? right? right? or left? haha..

Here are some other ways or situations on when you can use the search and replace function.

1. Correcting a typographical Error – you discovered that one of the words you frequently use was mispelled, for example instead of typing a bacon, you are typing in and using the word vacon with a “V” all the time (haha..)

2. Updating a Name/Word - you want to change word1 to word2, or name1 to name2

3. Deleting Weird Characters - you are copying and pasting articles from one site or documents and you didn’t noticed that some special characters are also copied eg. Â, ♠ , ¶ ,Æ and so on..

Here are some methods that you can do to search and replace texts in wordpress database or blog posts.

1. using MySQL search and replace function within PHPMYADMIN

open your wordpress database using phpmyadmin, click the SQL tab and enter the following codes:

UPDATE wp_posts SET post_content = REPLACE (
post_content,
'OLD TEXT',
'NEW TEXT');

the code above uses the MySQL replace function to first search the OLD TEXT in the wp_posts table then post_content field, and when found replace it with the NEW TEXT.

you can search and replace datas from any tables/table fields in the database. you can also use this method on any applications that uses mysql as a database.

2. using WordPress Search and Replace Plugin

same functionality as the mysql replace function, the only difference is this plugin provides a user interface within the wordpress admin panel. you can download the plugin here. http://wordpress.org/extend/plugins/search-and-replace/

NOTE: Don’t forget to create a back up of your database first before trying any of the methods above. ok? it’s better to be sure, right?

Enjoy! please share.

<?php
//define variables..
$str = '9';
$int = 9;

//Returns true since both variable contains the same value..
$res = ($str==$int);

//Returns false since the two variables are not of the same type..
$res = ($str===$int);
?>

I. Define the Variables

<?php
$num1 = 9;
$num2 = 9;
$num3 = 22;
?>

A. The Less Than Operator

<?php
//Returns true if variable in the left side is less than the right..
$res = ($num1 < $num3);
//returns true..
?>

B. The Greater Than Operator

<?php
//Returns true if the variable in left side is greater that the right..
$res = ($num3 > $num1);
//returns true..
?>

C. The Less Than or Equal-to Operator

<?php
//returns true if variable on left is less than or equal to right..
$res = ($num3 <= $num1);
//returns false
?>

D. The Greater Than or Equal-to Operator

<?php
//returns true if variable on left is greater than or equal to right..
$res = ($num3 >= $num2);
//returns true..
?>

E. The Equality Operator

<?php
//returns true if both variables are equal to each other
$res = ($num1 == $num2);
//returns true..
?>

F. The Not Equal-to Operator

<?php
//returns true if the variable on left is not equal to right
$res = ($num1 != $num2);
//returns false..
?>

G. The Inequality Operator

<?php
//returns true if the variable on left is not equal to right..
$res = ($num1 <> $num2);
//returns false..
?>

<?php
// intialize variables
$username = "daniel";
$domain = "danieldumas.com";

// the variable string $username and $domain can be combine using the concatenation operator
$email_address = $username . '@'. $domain;

//the variable $email_address now contains the value "daniel@danieldumas.com"

?>

You can also concatenate simultaneously. .

<?php

$name = "dan";

//add and assign values to the string $name..

$name .= "iel";

//the variable $name now contains "daniel"

?>

Using PHP Arithmetic Operator

//define variables
<?php

$num1 = 50;
$num2 = 30;

//Addition
$sum = $num1 + $num2;

//Subtraction
$difference = $num1 - $num2;

//Multiplication
$product = $num1*$num2;

//Division
$quotient = $num1 / $num2;

//Modulus
$remainder = $num1 % $num2;

?>

you may also use the shorthand using the PHP Assignment Operator and Arithmetic Operator together.

PHP Assignment Operator and Arithmetic Operator Together

//define variables

< ?php

$num1 = 50;
$num2 = 30;

//Addition
$num1 = $num1+ $num2;
//Shorthand for this is..
$num1+=$num2;

//Subtraction
$num1 = $num1 - $num2;
//Shorthand for this is..
$num1-=$num2;

//Multiplication
$num1 = $num1 * $num2;
//Shorthand for this is..
$num1 *=$num2;

//Division
$num1 = $num1 / $num2;
//Shorthand for this is..
$num1 /=$num2;

//Modulus
$num1= $num1 % $num2;
//Shorthand for this is..
$num1%=$num2;

?>

Below is a list of PHP Operators and its function

<?php

//define variables
$on = true;
$age = 20;
$name = "daniel";
$price = 99.99;

//Returns Boolean
echo gettype($on);

//Returns String
echo gettype($name);

//Returns Integer
echo gettype($age);

//Returns Double
echo gettype($price);

?>

You can also use other PHP functions to determine the datatypes of a variable

Example 1: Processing forms in the same php file

Copy and Paste the code below to your text editor and save it as form.php, then run it on your localhost

<html>
<head>
<title>Saving Form Input in PHP Variables</title>
</head>
<body>

<form method="post">
Enter message : <input type="text" name="msg">
<input type="submit" value="Print Msg">

<?php
// stores the form data into a php variable
$msg = $_POST['msg'];
//Prints the data retrieve from the form
echo "You said: <b>$msg</b>";
?>

</body>
</html>

Example 2: Processing Form using external php file

Copy and Save the code below to your text editor and save it as form2.php

<html>
<head>
<title>Saving Form Input in PHP Variables</title>
</head>
<body>

<form action="msghandler.php" method="post">
Enter message : <input type="text" name="msg">
<input type="submit" value="Print Msg">

</body>
</html>

Copy and Save the code below to your text editor and save it as msghandler.php in the same folder where form2.php is located, this is the php script that will process the form2.php above

<?php
// stores the form data into a php variable
$msg = $_POST['msg'];
//Prints the data retrieve from the form
echo "You said: <b>$msg</b>";
?>

You Should Get this output in your browser. .

Before clicking the print button

After Clicking the print button