$asc() && $chr()
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$asc()

Description: Returns the ASCII Number of the Character
Need to know: Used with $chr alot.
Examples: $asc(A) returns 65 or $asc(*) returns 42 while $asc(9) returns 57

$chr()

Description: Returns the character with ASCII Number.
Need to know: Used with $asc alot.
Examples: $chr(65) == A and $chr(42) == * while $chr(57) returns 9 and also you can use both of asc and chr combined like this $chr($asc(h)) and it will return h but instead of finding out the number for h you can just put it inside of chr :).