String increment problem in php

The following code is shown:

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

The following results will appear:

This is because php follows Perl's habits when processing strings, not C's. P For example, er er

$ a = 'z'; $ a ++;

will turn

$ a

to 'aa' and in c, a = 'z'; a ++ ;

will turn

a into '[' (the ASCII value of 'Z' is 90, and the ASCII value of '[' is 91).

Character variables can only be incremented, not decremented, and only support pure letters (a-z and A-Z). Incrementing/decrementing other character variables is invalid and the original string will not change.

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The above introduces the problem of string increment in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.