Operators in PHP | PHP Operators

Operators in PHP | PHP Operators

There are three types of operators:

• Firstly there is the unary operator which operates on only one value. (For Example, ++ increment operator)
• The second group is termed as Binary operators; this group contains most of the operators that PHP supports. (For Example logical, conditional operator etc.)
• The third group is the ternary operator ? : . IT should be used to select between two expressions depending on a third one.

1. Arithmetic Operators in PHP:

Example	Name	Result
-$X	Negation	Opposite of $X
$X + $Y	Addition	Sum of $X and  $Y
$X – $Y	Subtraction	Difference of $X and $Y
$X *$Y	Multiplication	Product of $X and $Y
$X / $Y	Division	Quotient of $X and $Y
$X % $Y	Modulus	Remainder of $X divided by $Y

Example :
<?php
$X  = 5;
$Y = 3;
echo ( $X + $Y) , “<br>” ;
echo ( $X – $Y) , “<br>” ;
echo ( $X * $Y) , “<br>” ;
echo ( $X / $Y) , “<br>” ;
echo ( $X  %  $Y) ;
?>

2. Increment / Decrement Operator in PHP :

Example	Name	Result
++$X	Pre Increment	Increase $X by one and then returns $X.
$X++	Post Increment	Returns $X and then increase $X by one.
– -$X	Pre Decrement	Decrease $X by one and then returns $X.
$X- –	Post Decrement	Returns $X and then decrease $X by one.

Example :
<?php
$X =5;
Echo ++$X ,  “<br>”;

$X =5;
Echo  $X++ , “<br>”;

$Y =9;
Echo  – -$Y , “<br>”;

$Y =5;
Echo  $Y- – , “<br>”;
?>

3. Assignment Operators in PHP:

Operator	Example	IS the same as
=	$X = $Y	$X = $Y
+=	$X += $Y	$X = $X + $Y
-=	$X -= $Y	$X = $X – $Y
*=	$X *= $Y	$X = $X * $Y
/=	$X /= $Y	$X = $X / $Y
%=	$X %= $Y	$X = $X % $Y

Example :
<?php
$A = 10;
$A += 15;
echo  $A , “<br>”;

$B = 20;
echo $B -=5 ,  “<br>”;

$C = 10;
echo $C *= 2 , “<br>”;

$D  = 15;
echo $D /=4 ,”<br>”;

$E = 5;
echo $E %=3 ;
?>

4. Comparison Operators in PHP :

Example	Name	Result
$P == $Q	Equal	True if $P is equal to $Q.
$P === $Q	Identical	True if $P is equal to $Q with the same type.
$P != $Q	Not Equal	True if $P is not equal to $Q.
$P <> $Q	Not Equal	True if $P is not equal to $Q.
$P !== $Q	Not Identical	True if $P is not equal to $Q or they are not of the same type.
$P < $Q	Less than	True if $P is less than $Q.
$P <= $Q	Less than or equal to	True if $P is less than or equal to $Q.
$P > $Q	Greater than	True if $P is greater than $Q.
$P >= $Q	Greater than or equal to	True if $P is greater than or equal to $Q.

var_dump() function in php is used to display structured information with its type & value about the one or more variables.

Example :
<?php
$X = 100;
$Y = “100”;
echo var_dump ($X == $Y);
echo var_dump ($X === $Y);
echo var_dump ($X != $Y);
echo var_dump ($X !== $Y);

$X5= 5;  $Y = 4;
echo var_dump ($X > $Y);
echo var_dump ($X < $Y);
?>

5. Logical Operators in PHP :

Example	Name	Result
$P and $Q	And	True if both $P and $Q are true.
$P or $Q	Or	True if either $P or $Q is true.
$P xor $Q	Xor	True if either $P or $Q is True but not both.
!$P	Not	True if $P is not true.
$P && $Q	And	True if both $P and $Q are true.
$P || $Q	Or	True if either $P or $Q is true.

 

6. Ternary Operator in PHP:

• One type of conditional operator which takes three expression and use truth value of first expression to decide which of the other two expression to evaluate and return.
• Syntax :  Test expression ? yes expression : no expression
• The value of this expression is the result of yes expression if test expression is true otherwise no expression.

Example :
<?php
$A = 11;
$B = 22;
$A > $B ? $ans = “A is Big” : $ans= “B is Big”;
echo “<br>” , $ans;
?>

7. String Operators in PHP:

Two string operators are there. First string operator is ‘concatenation operator (.) ‘ which returns the concatenation of its left and right arguments.

Second is ‘Concatenation assignment operator ( := ) ‘ which appends the argument on the right side to the argument on the left side.

Example :
<?php
$X  = “Hello”;
$Y = $X . “Welcome”;
echo $Y;

$Z  = “Welcome”;
$Z .= ” To Code.Freefeast.info”;
echo “<br>” , $Z;
?>