Lecture Web technologies and programming – Lecture 23: Introduction to PHP (Part 2) - TRƯỜNG CÁN BỘ QUẢN LÝ GIÁO DỤC THÀNH PHỐ HỒ CHÍ MINH

17 Variable Declared Incremented Before Display Incremented After Display Displaying Incremented Value.. 19[r]

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Setting the environment

– Local

– Global

– Static

– Type Determination

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• Operators in PHP

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• Operators are used to perform operations on

variables and values.

• PHP divides the operators in the following groups :

• Arithmetic Operators:

with numeric values to perform common

subtraction, multiplication etc

– +, - ,*, /, %, **

• Assignment Operators:

used with numeric values to write a value

to a variable.

is "=" It means that the left operand gets set to the value of the assignment expression on the right.

– =

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designed for strings

• , .=

• $a=“abcd”.”efgh”; $a=abcdefgh

• $a.=“ijk”; $a=abcdefghijk

Operators:

First

Variable

Second Variable

Concatenation

Using =

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Adds $b in $a Concatenates $b with

$a

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• The PHP increment operators are used

to increment a variable's value.

• The PHP decrement operators are used

to decrement a variable's value.

– ++ ,

• $b=$a++

• $b=++$a

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Variable Declared Incremented Before Display

Incremented After Display

Displaying Incremented Value

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combine conditional statements

– AND, OR, NOT, XOR

– &&, ||, !

Logical Operators: