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PHP Integer An integer is a whole number (without decimals).  It is a number between -2,147,483,648 and +2,147,483,647. Rules for integers: An integer must have at least one digit (0-9) An integer cannot contain comma or blanks An integer must not have a decimal point An integer can be either positive or negative Integers can be specified in three formats: decimal (10-based), hexadecimal (16-based - prefixed with 0x) or octal (8-based - prefixed with 0) In the following example $x is an integer. The PHP var_dump() function returns the data type and value: Example <?php $x = 5985; var_dump($x); ?>

PHP Data Types Variables can store data of different types, and different data types can do different things. PHP supports the following data types: String Integer Float (floating point numbers - also called double) Boolean Array Object NULL Resource PHP String A string is a sequence of characters, like "Hello world!". A string can be any text inside quotes. You can use single or double quotes: Example <?php $x = "Hello world!"; $y = 'Hello world!'; echo $x; echo "<br>"; echo $y; ?>

PHP 5  Tutorial PHP is a server scripting language, and a powerful tool for making dynamic and interactive Web pages. PHP is a widely-used, free, and efficient alternative to competitors such as Microsoft's ASP.