Basic PHP Data Types

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Basic PHP Data Types

The first data type I'll introduce you to is the integer. The integer is the fundamental numeric data type in PHP and represents whole-number signed values up to a little over 2 billion. In practice, PHP will accept integer values using three mathematical bases: decimal (base 10), octal (base 8), and hexadecimal (base 16). In most situations, PHP scripts are written using decimal notation; however, in some situations octal or hexadecimal numbers make life easier.

Listing 1.4. Storing Integers in PHP

<?php



$my_int = 50;       /* Standard Decimal Notation */

$my_int = O62;      /* Same number, Octal Notation (starts with the letter O)*/

$my_int = 0x32;     /* Hexadecimal Notation */



?>

When working with fractions, PHP represents the value using the floating-point data type. Floating-point numbers are defined as any number that contains a decimal fraction and that can be expressed in decimal or scientific notation.

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