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increment-decrement 
$x++; // equivalent to $x = $x+1;
$x--; // equivalent to $x = $x-1; 
$x++; // post-increment 
$x--; // post-decrement 
++$x; // pre-increment 
--$x; // pre-decrement
The difference is that the post-increment returns the original value before it changes the variable, while the pre-increment changes the variable first and then returns the value. Example: 
$a  = 2; $b = $a++; // $a=3,  $b=2
$a  = 2; $b = ++$a; // $a=3,  $b=3
by Guram Azarashvili
2 years ago
PHP
PHP official doc
0
Pro tip: use ```triple backticks around text``` to write in code fences