Operators in Php

Assignment Operators

Assignment operators are used to assign a value or set a variable to another variable's value. Such an assignment  is done with the "=", or equal character.
Example:

$var = 11;
$another_var = $var;

Now both $my_var and $another_var contain the value 11. Assignments can also be used with arithmetic operators.

Arithmetic Operators

Operator	Meaning	Example
+	Addition	12 + 14
-	Subtraction	16 - 12
*	Multiplication	15 * 13
/	Division	15 / 3
%	Modulus	43 % 10

Example:

$addition = 12 + 14; 
$subtraction = 16 - 12; 
$multiplication = 15 * 13; 
$division = 15 / 3; 
$modulus = 15 % 12; 
echo "addition: 12 + 14 = ".$addition."<br />"; 
echo "subtraction: 16 - 12 = ".$subtraction."<br />"; 
echo "multiplication:  15 * 13 = ".$multiplication."<br />"; 
echo "division: 15 / 3 = ".$division."<br />"; 
echo "modulus: 15 % 12 = " . $modulus 
 . ". Modulus is the remainder after the division operation.

Result:

addition: 12 + 14 = 26
subtraction: 16 - 12 = 4
multiplication: 15 * 13 = 195
division: 15 / 3 = 5
modulus: 15 % 12 = 1. Modulus is the remainder after the division operation.

Comparison Operators

Comparisons are used to check the relationship between variables and/or values.Here are the most important comparison operators of PHP.

Operator	Meaning	Example	Result
==	Equal To	$x == $y	false
!=	Not Equal To	$x != $y	true
<	Less Than	$x < $y	true
>	Greater Than	$x > $y	false
<=	Less Than or Equal To	$x <= $y	true
>=	Greater Than or Equal To	$x >= $y	false

String Operators

"." is used for concatation operator for strings in php.
Example :

$string1 = "Hiren";
$string2 = "Prajapati";
$result= $string1 ." ". $string2;
echo $result. "!";

Result:

Hiren Prajapati!

Array Operators

Operator	Meaning	Description
x + y	Union	Union of x and y
x == y	Equality	True if x and y have the same key/value pairs
x === y	Identity	True if x and y have the same key/value pairs in the same order and of the same types
x != y	Inequality	True if x is not equal to y
x <> y	Inequality	True if x is not equal to y
x !== y	Non-identity	True if x is not identical to y

Logical Operators

Example	Meaning/Name	Result
$a and $b	And	TRUE if both $a and $b are TRUE.
$a or $b	Or	TRUE if either $a or $b is TRUE.
$a xor $b	Xor	TRUE if either $a or $b is TRUE, but not both.
! $a	Not	TRUE if $a is not TRUE.
$a && $b	And	TRUE if both $a and $b are TRUE.
$a || $b	Or	TRUE if either $a or $b is TRUE.

Pre/Post-Increment & Decrement

    
 To add one to a variable or "increment" use the "++" operator: 
      $xyz++; Which is equivalent to $xyz += 1; or $x = $xyz + 1;
 To subtract 1 from a variable, or "decrement" use the "--" operator:
      $xyz--;  Which is equivalent to $xyz -= 1; or $xyz = $xyz - 1;

In addition to this "shorterhand" technique, you can specify whether you want to increment before the line of code is being executed or after the line has executed.