Returns 1 if a player with the specified ID number exists, 0 otherwise. This ID number is obtained using the "ID" trigger (see ID). Do not confuse PlayerID with TargetID.

Format: PlayerIDExist(ID_number)

Arguments:

- ID_number (int): An expression that evaluates to the ID number to check for.

Return type: boolean (1 if true or 0 if false)

Error conditions: Returns 'Bottom' if exprn evaluates to 'Bottom'.

Example:

`trigger1 = PlayerIDExist(var(4))
; Triggers if a player with an ID number equal to the value of var(4) exists.`