PHP
5 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
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)
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 $y Show it »
PHP
Increment / Decrement Operators
The PHP
increment operators are used to increment a variable's value.
The PHP
decrement operators are used to decrement a variable's value.
Operator Name Description Show it
++$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 »
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 »
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 »
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 »
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