Operators
Arithmetic operators
| Operator |
Name |
Result |
-$a |
negation |
Opposite of $a. |
$a + $b |
addition |
Sum of $a and $b. |
$a - $b |
Subtraction |
Difference of $a and $b. |
$a * $b |
Multiplication |
Product of $a and $b. |
$a / $b |
division |
Quotient of $a and $b. |
$a % $b |
modulus |
Remainder of $a divided by $b. |
$a ** $b |
Exponentiation |
Result of raising $a to the $b’th power. |
Comparison operators
| Operator |
Name |
Result |
$a == $b |
Equal |
TRUE if $a is equal to $b after type juggling. |
$a === $b |
Identical |
TRUE if $a is equal to $b, and they are of the same type. |
$a != $b |
Not equal |
TRUE if $a is not equal to $b after type juggling. |
$a <> $b |
Not equal |
TRUE if $a is not equal to $b after type juggling. |
$a !== $b |
Not identical |
TRUE if $a is not equal to $b, or they are not of the same type. |
$a < $b |
Less than |
TRUE if $a is strictly less than $b. |
$a > $b |
Greater than |
TRUE if $a is strictly greater than $b. |
$a <= $b |
Less than or equal to |
TRUE if $a is less than or equal to $b. |
$a >= $b |
Greater than or equal to |
TRUE if $a is greater than or equal to $b. |
$a <=> $b |
Spaceship |
-1 if $a is less than $b, 1 if $a is greater than $b, otherwise 0. |
Logical operators
| Operator |
Name |
Result |
! $a |
Not |
TRUE if $a is not TRUE. |
$a && $b |
And |
TRUE if both $a and $b are TRUE. |
$a || $b |
Or |
TRUE if either $a or $b is TRUE. |
$a and $b |
And |
Like && but precedence is lower. |
$a or $b |
Or |
Like || but precedence is lower. |
$a xor $b |
Xor |
TRUE if either $a or $b is TRUE, but not both. |
Simple-assignment operators
The simple-assignment operator = assigns its right operand to its left operand.
<?php
$a = 1;
echo $a; // 1
Compound-assignment operators
The compound-assignment operators combine the simple-assignment operator with another binary operator. Compound-assignment operators perform the operation specified by the additional operator, then assign the result to the left operand.
| Operator |
Shorthand |
Meaning |
+= |
$x += $y |
$x = $x + $y |
-= |
$x -= $y |
$x = $x - $y |
*= |
$x *= $y |
$x = $x * $y |
/= |
$x /= $y |
$x = $x / $y |
%= |
$x %= $y |
$x = $x % $y |
**= |
$x **= $y |
$x = $x ** $y |
.= |
$x .= $y |
$x = $x . $y |
<<= |
$x <<= $y |
$x = $x << $y |
>>= |
$x >>= $y |
$x = $x >> $y |
&= |
$x &= $y |
$x = $x & $y |
^= |
$x ^= $y |
$x = $x ^ $y |
|= |
$x |= $y |
$x = $x | $y |
