Operators are very small commands that work with variables and perform tasks:
| Operator |
Description |
Example |
Result |
| + |
Addition |
2+3 |
5 |
| – |
subtraction |
3-2 |
1 |
| / |
division |
6/2 |
3 |
| * |
multiplication |
3*4 |
12 |
| % |
division remainder |
7/3 |
1 |
| ++ |
increment by 1 |
$x=4; $x++; |
$x=5; |
| — |
Decrement by 1 |
$x=4; $x–; |
$x=3; |
| Operator |
Example |
The Same as |
| = |
$a=$b; |
$a=$b; |
| += |
$a+=$b; |
$a=$a+$b; |
| -+ |
$a-=$b; |
$a=$a-$b; |
| /= |
$a/=$b; |
$a=$a/$b; |
| *= |
$a*=$b; |
$a=$a*$b; |
| .= |
$a.=$b; |
$a=$a.$b; |
| %= |
$a%=$b; |
$a=$a%$b; |
| Operator |
Description |
Example |
| === |
Are they absolutely the same |
$a===$b assuming $a=1 and $b=”1″ result is false |
| == |
Are they equal |
$a==$b assuming $a=1 and $b=”1″ result is true |
| != |
Not equal |
$a!=$b assuming $a=1 and $b=2 result is true |
| <> |
Not equal |
$a<>$b assuming $a=1 and $b=1 result is false |
| > |
is greater |
$a>$b assuming $a=3 and $b=2 result is true |
| < |
is smaller |
$a<$b assuming $a=3 and $b=2 result is false |
| >= |
is greater or equal |
$a>=$b is true for $a=4 and $b=4 or $b=3 |
| <= |
is smaller or equal |
$a<=$b is true for $a=4 and $b=4 or $b=5 |
| Operator |
Description |
Example |
|
&&
and
|
It is true if both are true |
$a==5 && $b==7 returns true
$a==4 && $b==7 returns false
|
|
||
or
|
It is true if even one is true |
$a==5 || $b==7 returns true
$a==4 || $b==7 returns true
$a==4 || $b==8 returns false
|
| ! |
It is true if it is false and if it is false it is true |
!(true) returns false
!(false) return true
|
| Assuming $a=5 and $b= 7 |
There are other operators availible in PHP but discussing them is out of the present scope of this basic tutorial at this time. You can find more about operators here
