The increment of string in PHP

As shown in the following code:

$str = ' W '; for ($i =0; $i <6; $i + +) {echo + + $str. "\ r \ n";}

The following results will appear:

It's because PHP is dealing with strings that follow Perl's habits, not C's.

For example

In Perl $a = ' Z '; $a + +; will turn $a into ' AA '

In C,a = ' z '; a++; will turn a into a ' ['(' z ' ASCII value is all,' [' the ASCII value is 91).

Character variables can only be incremented, not decremented, and only plain letters (A-Z and A-Z) are supported. Increment/Decrement Other character variables are not valid and the original string does not change.

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