PHP 5 Operators

PHP Operators

Operators are used to perform operations on variables and values.

PHP divides the operators in the following groups:

• Arithmetic operators
• Assignment operators
• Comparison operators
• Increment/Decrement operators
• Logical operators
• String operators
• Array operators

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PHP Arithmetic Operators

The PHP arithmetic operators are used with numeric values to perform common arithmetical operations, such as addition, subtraction, multiplication etc.

Operator	Name	Example	Result	Show it
+	Addition	$x + $y	Sum of $x and $y	Show it »
-	Subtraction	$x - $y	Difference of $x and $y	Show it »
*	Multiplication	$x * $y	Product of $x and $y	Show it »
/	Division	$x / $y	Quotient of $x and $y	Show it »
%	Modulus	$x % $y	Remainder of $x divided by $y	Show it »
**	Exponentiation	$x ** $y	Result of raising $x to the $y'th power (Introduced in PHP 5.6)

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PHP Assignment Operators

The PHP assignment operators are used with numeric values to write a value to a variable.

The basic assignment operator in PHP is "=". It means that the left operand gets set to the value of the assignment expression on the right.

Assignment	Same as...	Description	Show it
x = y	x = y	The left operand gets set to the value of the expression on the right	Show it »
x += y	x = x + y	Addition	Show it »
x -= y	x = x - y	Subtraction	Show it »
x *= y	x = x * y	Multiplication	Show it »
x /= y	x = x / y	Division	Show it »
x %= y	x = x % y	Modulus	Show it »

PHP Comparison Operators

The PHP comparison operators are used to compare two values (number or string):

Operator	Name	Example	Result	Show it
==	Equal	$x == $y	Returns true if $x is equal to $y	Show it »
===	Identical	$x === $y	Returns true if $x is equal to $y, and they are of the same type	Show it »
!=	Not equal	$x != $y	Returns true if $x is not equal to $y	Show it »
<>	Not equal	$x <> $y	Returns true if $x is not equal to $y	Show it »
!==	Not identical	$x !== $y	Returns true if $x is not equal to $y, or they are not of the same type	Show it »
>	Greater than	$x > $y	Returns true if $x is greater than $y	Show it »
<	Less than	$x < $y	Returns true if $x is less than $y	Show it »
>=	Greater than or equal to	$x >= $y	Returns true if $x is greater than or equal to $y	Show it »
<=	Less than or equal to	$x <= $y	Returns true if $x is less than or equal to $y	Show it »

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PHP Increment / Decrement Operators

The PHP increment operators are used to increment a variable's value.

The PHP decrement operators are used to decrement a variable's value.

Operator	Name	Description	Show it
++$x	Pre-increment	Increments $x by one, then returns $x	Show it »
$x++	Post-increment	Returns $x, then increments $x by one	Show it »
--$x	Pre-decrement	Decrements $x by one, then returns $x	Show it »
$x--	Post-decrement	Returns $x, then decrements $x by one	Show it »

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PHP Logical Operators

The PHP logical operators are used to combine conditional statements.

Operator	Name	Example	Result	Show it
and	And	$x and $y	True if both $x and $y are true	Show it »
or	Or	$x or $y	True if either $x or $y is true	Show it »
xor	Xor	$x xor $y	True if either $x or $y is true, but not both	Show it »
&&	And	$x && $y	True if both $x and $y are true	Show it »
||	Or	$x || $y	True if either $x or $y is true	Show it »
!	Not	!$x	True if $x is not true	Show it »

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PHP String Operators

PHP has two operators that are specially designed for strings.

Operator	Name	Example	Result	Show it
.	Concatenation	$txt1 . $txt2	Concatenation of $txt1 and $txt2	Show it »
.=	Concatenation assignment	$txt1 .= $txt2	Appends $txt2 to $txt1	Show it »

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PHP Array Operators

The PHP array operators are used to compare arrays.

Operator	Name	Example	Result	Show it
+	Union	$x + $y	Union of $x and $y	Show it »
==	Equality	$x == $y	Returns true if $x and $y have the same key/value pairs	Show it »
===	Identity	$x === $y	Returns true if $x and $y have the same key/value pairs in the same order and of the same types	Show it »
!=	Inequality	$x != $y	Returns true if $x is not equal to $y	Show it »
<>	Inequality	$x <> $y	Returns true if $x is not equal to $y	Show it »
!==	Non-identity	$x !== $y	Returns true if $x is not identical to $y	Show it »

Credit: www.w3schools.com