Data types in php

Basically there are 8 different types of data types available in php.They are:





•Integer: Integers hold only whole numbers including positive and negative numbers, i.e., numbers without fractional part or decimal point. They can be decimal (base 10), octal (base 8) or hexadecimal (base 16). The default base is decimal (base 10).

•Double: Can hold numbers containing fractional or decimal part including positive and negative numbers. By default, the variables add a minimum number of decimal places.

•String: Hold letters or any alphabets, even numbers are included. These are written within double quotes during declaration. The strings can also be written within single quotes but it will be treated differently while printing variables.

•NULL: These are special types of variables that can hold only one value i.e., NULL. We follow the convention of writing it in capital form, but its case sensitive.NULL means empty value.

•Boolean: Hold only two values, either TRUE or FALSE. Successful events will return true and unsuccessful events return false. NULL type values are also treated as false in Boolean. Apart from NULL, 0 is also consider as false in boolean. If a string is empty then it is also considered as false in boolean data type.

•Arrays: Array is a compound data-type which can store multiple values of same data type. Below is an example of array of integers.

•Objects: Objects are defined as instances of user defined classes that can hold both values and functions. This is an advanced topic and will be discussed in details in further articles.

•Resources: Resources in PHP are not an exact data type. These are basically used to store references to some function call or to external PHP resources.

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