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PHP is loosely typed, which means it calculates data types as data is assigned to each variable.
Special Data Types
Standard Data Types
|Integer||A whole number|
|Double||A floating-point number|
|String||A collection of characters Boolean Array One of the special values true or false.|
|Array||Arrays are named and indexed collections of other values.|
|Objects||Objects are instances of programmer-defined classes,which
can kinds of
values and functions that are specific to the class.
|Resource||Reference to a third-party resource (e.g - a database)|
|Null||An uninitialized Variable.|
- Constants have global scope, so they are accessible.
- After they have been defined ,We can use everywhere in your scripts as well as inside functions.
<?php define("Greeting","TechKnow Heights"); echo constant("Greeting "); ?>
- Echo : The simplest use of echo is to print a string as argument.
echo "it is example to print a string ."; Or echo("it is example to print the string .");