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Incrementing and Decrementing Operators --

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Variables can be incremented or decremented by 1 with ++ or --, respectively. They can either precede or succeed variables and slightly vary semantically, as shown below. 

$i = 1;
echo $i; // Prints 1

// Pre-increment operator increments $i by one, then returns $i
echo ++$i; // Prints 2

// Pre-decrement operator decrements $i by one, then returns $i
echo --$i; // Prints 1

// Post-increment operator returns $i, then increments $i by one
echo $i++; // Prints 1 (but $i value is now 2)

// Post-decrement operator returns $i, then decrements $i by one
echo $i--; // Prints 2 (but $i value is now 1)

More information about incrementing and decrementing operators can be found in the official documentation.

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Operators:
* Operators
* Null Coalescing Operator
* Spaceship Operator
* Execution Operator
* Incrementing and Decrementing Operators --
* Ternary Operator
* Logical Operators AND and OR
* String Operators . and .
* Object and Class Operators
* Combined Assignment etc
* Altering operator precedence with parentheses
* Association
* Basic Assignment
* Comparison Operators
* Bitwise Operators
* instanceof type operator
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