PHP Operators
The PHP operators can be divided broadly into 5 categories namely,
- Arithmetic Operators
- Assignment Operators
- Comparison Operators
- Logical Operators
Arithmetic Operators
| Operator | Description |
| + | Addition |
| – | Subtraction |
| * | Multiplication |
| / | Division |
| % | Modulus |
| ++ | Increment |
| — | Decrement |
Let’s see a few examples.
$a = 4; $b = 2; $Add= $a + $b; $Sub= $a - $b; $Multip= $a * $b; $Div= $a / $b; $Mod= $a % $b; $Increm= $a++; $Decrem= $b--;
The reult of the above will be:
Add=6 Sub=2 Multip=8 Div=2 Mod=0 Increm=5 Decrem=1
Assignment Operators
| Operator | Description |
| = | $a = $b; assigns a the value of b (Equal) |
| += | $a+=$b; means $a = $a+$b; (Addition) |
| -= | $a-=$b; means $a = $a-$b; (Subtraction) |
| *= | $a*=$b; means $a = $a*$b; (Multiplication) |
| /= | $a/=$b; means $a = $a/$b; (Division) |
| .= | $a.=$b; means $a = $a.$b; (Concatenation) |
| %= | $a%=$b; means $a = $a%$b; (Modulus) |
Let’s take a look at a few examples:
$a = 4; $b = 2; 1) $a = $b; (assigns a the value 4) 2) $a+=$b; (a will have the value 6) 3) $a-=$b; (a will have the value 2) 4) $a*=$b; (a will have the value 8) 5) $a/=$b; (a will have the value 2) 6) $a%=$b; (a will have the value 0)
Comparison Operators
| Operator | Description |
| == | $a==$b; will return true if value of a is equal to value of b |
| != | $a!=$b; will return true if value of a is not equal to value of b |
| > | $a>$b; will return true if value of a is greater than value of b |
| < | $a<$b; will return true if value of a is less than value of b |
| >= | $a>=$b; will return true if value of a is greater than or equal to value of b |
| <= | $a<=$b; will return true if value of a is less than or equal to value of b |
Below are a few examples:
$a == $b;// test if two values are equal $a != $b;// test if two values are not equal $a < $b;// test if the first value is less than the second $a > $b;// test if the first value is greater than the second $a <= $b;// test if the first value is less than or equal to the second $a >= $b;// test if the first value is greater than or equal to the second
Logical Operators
| Operator | Description |
| && | and; returns true when two or more conditions are be true |
| || | or; returns true when either of the two conditions is true |
| ! | not; negates a given condition |