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Lesson 3.5. 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

Operator Description Comment
. concatenate two strings

Opérateurs d'affectation

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
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>

Here is the expected result:

PHP operators exercice on transtype concatantion

See also


Last update : 01/25/2020