php - A confision of increment operator -

this question has answer here:

$a = 'z99'; var_dump(++$a);

above code output aa00.i'm confused output. can me?

that's because php follows perl's convention.

so because string 99 goes 00 -> next increment , z goes aa. if have done y99 have been z00.

$s = 'w'; ($n=0; $n<6; $n++) {     echo ++$s . php_eol; }

returns:

x y z aa ab ac

note decrementing strings won't work in php.

$s = 'w'; ($n=0; $n<6; $n++) {     echo --$s . php_eol; }

returns: w w w w w w

Ruby Co