Learn PHP Operators with example

Learn PHP Operators with example

Operators are mathematical, string, comparison, and logical commands such as minus , plus, divide, times. PHP operators are very similar to plain arithmetic for eg.

echo 10+5;

this will output 15

Various arithmetic operators in PHP are as follows

Operator	Description	Example
+	Addition	$m+1
-	Subtraction	$m-1
*	Multiplication	$m*5
/	Division	$m/2
++	Increment	++$m
--	Decrement	--$m
%	Modulus	$m%2

PHP Assignment operator

Assignment operators are used to assign values to variables.

Operator	Example	Equivalent to
=	$m=5	$m=5
+=	$m +=2	$m= $m+2
-=	$m -=2	$m=$m-2
*=	$m*=2	$m=$m*2
/=	$m/=2	$m=$m/2
.=	$m.=$h	$m=$m.$h
%=	$m%=2	$m=$m%2

PHP Comparison operator

Comparison operator are used inside a construct such as an if statement where you need to compare two items.

Operator	Description	Example
==	Is equal to	$m==2
!=	Is not equal to	$m!=3
>	Is greater than	$m>3
<	Is less than	$m<25
>=	Is greater than or equal to	$m>=25
<=	Is less than equal to	$m<=5

PHP Logical Operator

Logical operator can also be input to another logical operator. If something has a true or false value, it can be used as input to a logical operator. A logical operator takes two true or false inputs and produces a true or false result.

&& is interchangeable with “ and ”

||  is interchangeable with “ or “

Example

If($time>12 && $time<13) dosleep();

Mysql_select_db($database) or die(“unable to select database”);

$ingredent = $ammonia xor $bleach;

PHP Variable assignment

Variable = value;

Variable=variable;

$m +=5;

$y -=5;

PHP Variable incrementing and decrementing

++$m;

--$y;

If(++$m==5)echo$m;

If($m-- ==1) echo $m;

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