Lesson 4.5. PHP operators
Operator list
The PHP operators are inspired by the operators used in C. Here is a non-exhaustive list:
Arithmetic operators
Operator |
Description |
Comment |
+ |
addition |
|
- |
subtraction |
|
* |
multiplication |
|
/ |
division |
|
% |
modulo |
Rest of the division between two integers |
** |
exponential |
|
String operator
Assignment operators
Operator |
Description |
Comment |
= |
assignment |
$a = 5; the integer 5 is assigned to the variable $a |
+= |
addition and assignment in short form |
$a += $b is equivalent to $a = $a + $b; |
-= |
subtraction and assignment in short form |
$a -= $b is equivalent to $a = $a - $b; |
*= |
multiplication and assignment in short form |
$a *= $b is equivalent to $a = $a * $b; |
/= |
division and assignment in short form |
$a /= $b is equivalent to $a = $a / $b; |
%= |
modulo and assignment in short form |
$a %= $b is equivalent to $a = $a % $b; |
.= |
concaténation and assignment in short form |
$a .= $b is equivalent to $a = $a . $b; |
Comparison operators
Operator |
Description |
Comment |
== |
equal to |
Same values |
=== |
equal to |
Same types and values |
!= |
not equal to |
Different values |
<> |
not equal to |
Different type and value |
!== |
not equal to |
Different type or value |
< |
less than |
|
> |
greater than |
|
<= |
less or equal to |
|
>= |
greater or equal to |
|
<=> |
an integer less, equal or greater than zero
$a <=> $b => when $a is respectively less, equal, or greater than $b . |
Since PHP 7 |
Bitwise operators
Operator |
Description |
Comment |
& |
bitwise AND |
|
| |
bitwise OR |
|
^ |
bitwise XOR |
|
~ |
bitwise NOT |
|
<< |
bitwise left Shift |
|
>> |
bitwise right Shift |
|
Logical operators
Unlike bitwise operators, the operators below returns
only two values: TRUE
or FALSE
.
Operator |
Description |
Comment |
and ou && |
logical AND |
|
or ou || |
logical OR |
|
xor |
logical XOR |
|
! |
logical NOT |
|
Example
Here is an example of some operators:
$a = '6';
$b = 4 + 2;
// True
if ($a==$b) echo "== Same values\n";
// False
if ($a===$b) echo "=== Same values and same type\n";
// False
if ($a!=$b) echo "!= Not equal\n";
// Faux
if ($a<>$b) echo "<> Different value and type\n";
// Vrai
if ($a!==$b) echo "!== Different value or type\n";
Exercice
Let's consider the following PHP variable declarations:
<pre>
<?php
$begin = "I love this ";
$middle = "class, PHP is";
$end = " awesome!";
$string = '5';
$integer = 6;
$float = 3.2;
?>
</pre>
- Concatanate and display
$begin
, $middle
and $end
.
- Add
$string
, $integer
and $float
. Display the result.
- Calculate 2 power 10, display the result.
Here is the expected result:
![PHP operators exercice on transtype concatantion]()
See also
Last update : 09/17/2022