Logical operators are used to combine conditional statements.

and

($x and $y) True if both $x and $y are true

$x = 40; 
$y = 50;
if ($x > 30 and $y > 45) {
    echo "True";
}

or

($x or $y) True if either $x or $y is true

$x = 40; 
$y = 50;
if ($x > 30 or $y == 85) {
    echo "True";
}

xor

($x xor $y) True if either $x or $y is true, but not both

$x = 40; 
$y = 50;
if ($x > 30 xor $y == 85) {
    echo "True";
}

&&

($x && $y) True if both $x and $y are true

$x = 40; 
$y = 50;
if ($x > 30 and $y > 45) {
    echo "True";
}

||

($x || $y) True if either $x or $y is true

$x = 40; 
$y = 50;
if ($x > 30 or $y == 85) {
    echo "True";
}

!

(!$x) True if $x is not true

$x = 40;
if ($x !== 50) {
    echo "True";
}

HTML დამწყებებისთვის

<?php $minNumber = 1; $maxNumber = 100; $sum; function myCounter(){ global $minNumber,$maxNumber, $sum; $sum= $minNumber + $maxNumber; // if i want to use global variables in function must use global or GLOBALS[] } myCounter(); echo $sum; // output 101 ?>

`If string value(number) is less than 5 returns "Your number is less than 5!"

$st = strlen("game"); // returns 4

if ($st < 5 ) {
	echo "Your number is less than 5!". "\n";

` if number is more than 5, but less than 10 returns: } elseif ($st < 10) { echo "Your number is less than 10!". "\n";

`
And finally, if the number is higher than 10 returns:

	} else {
		echo "Your number is out of the range:("."\n";
	}

`

Line1

Hello world, This is sample text

Line2

Hello, world What's going On

We want to search string that contains:

world & going

words VISUAL STUDIO Example:

STEP 1: Press CTRL + F (Open find dialog)
STEP 2: Press ALT + R (Use Regular expression)
STEP 3: Write 
world(.*)going
 in the search field 

The search result will be:

Hello, 
world
 What's 
going
 On

because it contains the same time words "world" and "going"

Variables are used to store data, like string of text, numbers, etc. Variable values can change over the course of a script. Here're some important things to know about variables: 1. In PHP, a variable does not need to be declared before adding a value to it. PHP automatically converts the variable to the correct data type, depending on its value. 2. After declaring a variable it can be reused throughout the code. The assignment operator (=) used to assign value to a variable. Naming Conventions for PHP Variables These are the following rules for naming a PHP variable: All variables in PHP start with a $ sign, followed by the name of the variable. A variable name must start with a letter or the underscore character _. A variable name cannot start with a number. A variable name in PHP can only contain alpha-numeric characters and underscores (A-z, 0-9, and _). A variable name cannot contain spaces.

==

(Equal) Returns true if $x is equal to $y

$x = 40; 
$y = "40";
var_dump($x == $y); // true

===

(Identical) Returns true if $x is equal to $y, and they are of the same type

$x = 40; 
$y = "40";
var_dump($x === $y); // false

!=

(Not equal) Returns true if $x is not equal to $y

$x = 40; 
$y = "40";
var_dump($x != $y); // false

<>

(Not equal) Returns true if $x is not equal to $y

$x = 40; 
$y = "40";
var_dump($x <> $y); // false

!==

(Not identical) Returns true if $x is not equal to $y, or they are not of the same type

$x = 40; 
$y = "40";
var_dump($x !== $y); // true

>

(Greater than) Returns true if $x is greater than $y

$x = 40; 
$y = 50;
var_dump($x > $y); // false

<

(Less than) Returns true if $x is less than $y

$x = 40; 
$y = 50;
var_dump($x < $y); // true

>=

(Greater than or equal to) Returns true if $x is greater than or equal to $y

$x = 40; 
$y = 50;
var_dump($x >= $y); // false

<=

(Less than or equal to) Returns true if $x is less than or equal to $y

$x = 40; 
$y = 50;
var_dump($x <= $y); // true

Assignment operators are used with:

integer

and

float

values to write / update a variable value. Simple Assignment

$y = 9;
$x = $y;
echo $x . "\n";

Addition

$x = 40; $y = 9;
$x += $y; // same as: $x = $x + $y
echo $x . "\n";

Subtraction

$x = 40; $y = 9;
$x -= $y; // $x = $x - $y
echo $x . "\n";

Multiplication

$x = 40; $y = 9;
$x *= $y; // $x = $x * $y
echo $x . "\n";

Division

$x = 40; $y = 9;
$x /= $y; // $x = $x / $y
echo $x . "\n";

Modulus

$x = 40; $y = 9;
$x %= $y; // $x = $x % $y
echo $x . "\n";

Arithmetic operators work with:

integer

and

float

values to perform arithmetical operations. Let's define two variables:

number1

and

number2

and perform these operations

$number1 = 40;
$number2 = 9;

Addition

echo $number1 + $number2 . "\n";

Subtraction

echo $number1 - $number2 . "\n";

Multiplication

echo $number1 * $number2 . "\n";

Division

echo $number1 / $number2 . "\n";

Modulus

echo $number1 % $number2 . "\n";

PHP Variables https://learning.applications.ge/note/public/3278 https://www.sololearn.com/learning/1059/1797/3456/1 https://www.w3schools.com/php/php_variables.asp https://www.javatpoint.com/php-variables https://www.tutorialrepublic.com/php-tutorial/php-variables.php Arithmetic Operators https://learning.applications.ge/note/public/3293 https://www.sololearn.com/learning/1059/1803/3469/1 https://www.w3schools.com/php/php_operators.asp Assignment Operators https://learning.applications.ge/note/public/3294 https://www.sololearn.com/learning/1059/1804/3472/1 https://www.w3schools.com/php/php_operators.asp Comparison Operators https://learning.applications.ge/note/public/3295 https://www.sololearn.com/learning/1059/1805/3503/1 https://www.w3schools.com/php/php_operators.asp Rules to create PHP variable https://learning.applications.ge/note/public/3277 https://www.roseindia.net/tutorial/php/phpbeginners/PHPvariable.html Case Sensitivity https://learning.applications.ge/note/public/3283 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