title: PHP Operators
PHP Operators
Operators are used to perform operations on variables and values.
PHP divides the operators in the following groups:
- Arithmetic operators
- Assignment operators
- Comparison operators
- Increment/Decrement operators
- Logical operators
- String operators
- Array operators
PHP Arithmetic Operators
The PHP arithmetic operators are used with numeric values to perform common arithmetical operations, such as addition, subtraction, multiplication etc.
| Operator | Name | Example | Result |
|---|---|---|---|
| + | Addition | $a + $b | Sum of $a and $b |
| – | Subtraction | $a – $b | Difference of $a and $b |
| * | Multiplication | $a * $b | Product of $a and $b |
| \/ | Division | $a / $b | Quotient of $a and $b |
| \% | Modulus | $a % $b | Remainder of $a divided by $b |
| ** | Exponentiation | $a ** $b | Result of raising $a to the $b’th power |
PHP Comparison Operators
The PHP comparison operators are used to compare two values
| Operator | Name | Example | Result |
|---|---|---|---|
| == | Equal | $a == $b | Returns true if $a is equal to $b |
| === | Identical | $a === $b | Returns true if $a is equal to $b, and they are the same type |
| != | Not equal | $a != $b | Returns true if $a is not equal to $b |
| <> | Not equal | $a <> $b | Returns true if $a is not equal to $b |
| !== | Not identical | $a !== $b | Returns true if $a is not equal to $b, or they are different types |
| > | Greater than | $a > $b | Returns true if $a is greater than $b |
| \< | Less than | $a < $b | Returns true if $a is less than $b |
| >= | Greater than or equal to | $a >= $b | Returns true if $a is greater than or equal to $b |
| \<= | Less than or equal to | $a <= $b | Returns true if $a is less than or equal to $b |
| \<=> | Spaceship | $a <=> $b | Returns an integer less than, equal to, or greater than zero when $a is respectively less than, equal to, or greater than $b. |
Note: Spaceship operator is available as of PHP 7+
Spaceship example
echo 1 <=> 0; // returns 1
echo 1 <=> 1; // returns 0
echo 1 <=> 2; // returns -1