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PHP operators are very similar in different programming languages like
C++, JavaScript, Java. Operator is a symbol that is used to perform any
operation. Operators are used to perform arithmetic or logic operations,
there are many types of operators.
1) Arithmetic operators
2) Comparison operators
3) Logical operators
Arithmetic Operators
Arithmetic operators are used to perform any arithmetic operation (addition,
division, subtraction, multiplication). In PHP following operators are
used
| Operator |
Example |
Functionality |
| + |
2+4 |
Addition
of 2 or more than 2 values |
| - |
8-2 |
Substraction
of 2 or more than 2 values |
| * |
5*7 |
Multiplaction
of 2 or more than 2 values |
| / |
18/3 |
Division
of 2 or more than 2 values |
| % |
76%10 |
Modulus
of 2 or more than 2 values |
Example
| <body>
<?php
var $val1=35;
var $val2=38;
var $val3;
val3=$val1+$val2;
echo($val1+”+”+$val2+”=”+$val3);
?> |
The output of this example is below:
Comparison Operators
Comparison operators are used to compare two or more value. A double
equal sign (==) compares two values but A single equal sign sets a value.
Comparison operators are used inside conditional statements and evaluate
to either true or false. Following comparison operators are used
in PHP.
| Operator |
Example |
Functionality |
| == |
a==b |
variable
a is equal to variable b |
| != |
a!=b |
variable
a is not equal to variable b |
| < |
a<b |
variable
a is less than variable b |
| > |
a>b |
variable
a is greater than to variable b |
| <= |
a<=b |
variable
a is less than or equal to variable b |
| => |
a=>b |
variable
a is greater than or equal to variable b |
| <html>
<head>
<title>PHP Example</title>
</head>
<body>
<?php
$a= 8;
$b= 3;
$c= 3;
echo $a ==$b,"<br>";
echo $a != $b,"<br>";
echo $a <$b,"<br>";
echo $a > $b,"<br>";
echo $a >=$c,"<br>";
echo $b <=$c,"<br>";
?>
</body>
</html>
|
Logical Operators
Logical operators are used to evaluate several comparisons, by combining
their possible values.
| Operator |
Example |
Functionality |
| && |
(5>3)
&& (5<7) |
Returns
true when both conditions are true. |
| || |
(5>3)||(5<7) |
Returns
true when at least one of the two conditions is true. |
| ! |
!(5>3)
|
Denies
the value of the expression. |
<head>
<title>PHP Example</title>
</head>
<body>
<?php
$a = 8;
$b = 3;
$c = 3;
echo (a ==b) && ($c > $b),"<br>";
echo ($a == $b) || ($b == $c),"<br>";
echo !($b <= $c),"<br>";
?>
</body>
</html>
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Note: You can easily understand comparison and logical operators
in next chapter conditional statement.
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