PHP OPERATORS

Php operators
   —Variables are simply containers for information. In order to do anything useful with them, you need Operators .Operators are symbols that tell the PHP processor to perform certain actions.

For example, the addition(+) symbol is an Operators 
that tells PHP to add two variables or values, while the greater-than(>) symbol
is an Operators that tells PHP to compare two values.

 Type of operators  

—There are four type of operators:-

—Arithmetic Operators

—Assignment Operators

—Comparison Operators

—Logical Operators

Arithmetic operators in PHP

<?php

$x=10;  $y=5;

//addition

$sum=$x+$y;

echo "sum=".$sum."<br/>";

?>

Output : sum = 15

Assignment operators in PHP

 <?php

$x = 500;

$x+= 500; // $x=$x+$x;

echo "sum=".$x."<br/>";

?>

Output : sum=1000

PHP comparative operators

 <?php

$x=10;

$y=10.0;

echo ($x==$y);

//it returns true because both the variable contains same value.

echo ($x===$y);

/*it returns false because === strongly compares. here both variable contain same value i.e 10 but different data
type one is integer and another is float.*/

?>

Figure

PHP logical operators

 <?php

$name="alex";

$pass="alex123";

if($name=="alex" && $pass=="alex123")

{

  header('location:one.php');

}

else

{

         echo "Invalid name or password";

}

?>

Operator Precedence in PHP

—You would have probably learned about BOD-MAS, a mnemonic that specifies the order in which a calculator or a computer performs a sequence of mathematical operations.

—Brackets , order , Division , Multiplication , Addition , and Subtraction.

—PHP’s precedence rules are tough to remember.
Parentheses always have the highest precedence, so wrapping an expression in these will force PHP to evaluate it first, when using multiple sets of parentheses.

<?php

echo (((4*8)-2)/10);

echo (4*8-2/10);

?>

Output : with parentheses :3

  without parentheses :31.8