PHP - Operators

Operators are used to operate on values. 

There are many operators used in PHP, so we have separated them into the following categories to make it easier to learn them all.

Arithmetic Operators

Assignment Operators

Comparison Operators

Logical Operators

Pre/Post-Increment & Pre/Post-Decrement

This may seem a bit absurd, but there is even a shorter shorthand for the common task of adding 1 or subtracting 1 from a variable. To add one to a variable or "increment" use the "++" operator:

$x++; Which is equivalent to $x += 1; or $x = $x + 1;

To subtract 1 from a variable, or "decrement" use the "--" operator:

$x--; Which is equivalent to $x -= 1; or $x = $x - 1;

In addition to this "shorterhand" technique, you can specify whether you want the increment to before the line of code is being executed or after the line has executed. Our PHP code below will display the difference.

Display:

As you can see the value of $x++ is not reflected in the echoed text because the variable is not incremented until after the line of code is executed. However, with the pre-increment "++$x" the variable does reflect the addition immediately.

Credits: www.tizag.com www.w3schools.com 

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