Friday, February 10, 2012

Different Data Types in PHP

PHP supports wide range of Data Types. It supports eight different primitive data types: four scalar types (boolean, integer, float, string), two command types: (array and object) and finally two special types (resource, NULL). All these data types are discussed below:
Boolean:
Boolean is data type whose value is either true or false. True and false in PHP are case insensitive. To specify a boolean literal, use the keywords TRUE or FALSE. For example:
<?php
$bool1 = true; //assign the value true to$bool1
$bool2 = false; //assign the value false to$bool2
if($bool1){ echo "It is true"; }else{ echo "It is not true"; } ?>  Integer: An integer is number of the set I = {…, –3, –2, –1, 0, 1, 2, 3 ,…….} .Integer can be specified in Decimal, Hexadecimal, Octal or Binary. For example: <?php$a = 1234; // decimal number
$a = -123; // a negative number$a = 0123; // octal number (equivalent to 83 decimal)
$a = 0x1A; // hexadecimal number (equivalent to 26 decimal) ?> <?php$a = 1234; // decimal number
$a = -123; // a negative number$a = 0123; // octal number (equivalent to 83 decimal)
$a = 0x1A; // hexadecimal number (equivalent to 26 decimal) ?>  Float: Floating points numbers are real numbers. There are infinite floating point numbers between any two integer. In PHP, there are different ways to represent floating point numbers. <?php$a = 1.234;
$b = 1.2e3;$c = 7E-10;
?>



String:

string in PHP is stream of characters. A statement that is enclosed by single (‘’) or double quote (“ “) is regarded as string. There are various operations on string in PHP. Some are
<?php
$firstString = "The quick brown fox";$secondString = " jumped over the lazy dog";
$thirdString =$firstString; //assign value of firstString to thirdString
$thirdString .=$secondString; //concatenate
?>
Lower case: <?php echo strtolower($thirdString); ?></br> Upper case: <?php echo strtoupper($thirdString); ?></br>
Lowercase first-letter: <?php echo ucfirst($thirdString); ?></br> Uppercase Words: <?php echo ucwords($thirdString); ?></br>
Length: <?php echo strlen($thirdString); ?></br> Trim: <?php echo trim($thirdString); ?></br>