Introduction To PHP (Variables & Data types)

Mar 27, 2019Download as pptx, pdf0 likes134 views

Variables in PHP are denoted with a leading dollar sign ($) and are assigned values using the = operator. Variable names must begin with a letter or underscore and cannot contain special characters. PHP has 8 main data types - integers, doubles, booleans, null, strings, arrays, objects, and resources - which are used to define variables. Escape sequences like \n and \t can be used to insert special characters into strings.

Variables & Data Types in PHP
Part-III
Presented By: Sidrah Altaf
Vocational Training Centre Saddar Karachi

PHP Variables:
 The main way to store information in the middle of a PHP program
is by using a variable. Here are the most important things to know
about variables in PHP:
1) All variables in PHP are denoted with a leading dollar sign ($).
2) The value of a variable is the value of its most recent assignment.
3) Variables are assigned with the = operator, with the variable on the left-hand
side and the expression to be evaluated on the right.
4) Variable names must begin with a letter or underscore character.
5) A variable name can consist of numbers, letters, underscores but you cannot
use characters like + , - , % , ( , ) . & , etc .
6) You can’t give space in variable name.

Introduction To PHP (Variables & Data types)

PHP Data Types:
 PHP has a total of eight data types which we use to construct our
variables:
1) INTEGERS: are whole numbers, without a decimal point, like 4195.
2) DOUBLES: are floating-point numbers, like 3.14159 or 49.1.
3) BOOLEANS: have only two possible values either true or false.
4) NULL: is a special type that only has one value: NULL.
5) STRINGS: are sequences of characters, like 'PHP supports string operations.'
6) ARRAYS: are named and indexed collections of other values.
7) OBJECTS: are instances of programmer-defined classes, which can package up
both other kinds of values and functions that are specific to the class.
8) RESOURCES: are special variables that hold references to resources external to
PHP (such as database connections).

PHP Scape Sequence Replacements:
1) n is replaced by new line character.
2) r is replaced by the carriage-return character
3) t is replaced by the tab character
4) $ is replaced by the dollar sign itself ($)
5) " is replaced by a single double-quote (")
6) is replaced by a single backslash ()

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Introduction To PHP (Variables & Data types)

1. Variables & Data Types in PHP Part-III Presented By: Sidrah Altaf Vocational Training Centre Saddar Karachi

2. PHP Variables:  The main way to store information in the middle of a PHP program is by using a variable. Here are the most important things to know about variables in PHP: 1) All variables in PHP are denoted with a leading dollar sign ($). 2) The value of a variable is the value of its most recent assignment. 3) Variables are assigned with the = operator, with the variable on the left-hand side and the expression to be evaluated on the right. 4) Variable names must begin with a letter or underscore character. 5) A variable name can consist of numbers, letters, underscores but you cannot use characters like + , - , % , ( , ) . & , etc . 6) You can’t give space in variable name.

4. PHP Data Types:  PHP has a total of eight data types which we use to construct our variables: 1) INTEGERS: are whole numbers, without a decimal point, like 4195. 2) DOUBLES: are floating-point numbers, like 3.14159 or 49.1. 3) BOOLEANS: have only two possible values either true or false. 4) NULL: is a special type that only has one value: NULL. 5) STRINGS: are sequences of characters, like 'PHP supports string operations.' 6) ARRAYS: are named and indexed collections of other values. 7) OBJECTS: are instances of programmer-defined classes, which can package up both other kinds of values and functions that are specific to the class. 8) RESOURCES: are special variables that hold references to resources external to PHP (such as database connections).

5. PHP Scape Sequence Replacements: 1) n is replaced by new line character. 2) r is replaced by the carriage-return character 3) t is replaced by the tab character 4) $ is replaced by the dollar sign itself ($) 5) " is replaced by a single double-quote (") 6) is replaced by a single backslash ()

6. THANK YOU

Introduction To PHP (Variables & Data types)

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Introduction To PHP (Variables & Data types)