Minecraft Server Pinger error [closed]

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In PHP, single-quoted strings are not subject to variable expansion. The string literal '$IP' represents a string containing three characters: $, I, and P, in that order. ('$IP' === "\$IP")

You don’t need the quote characters at all. Just $IP will suffice. If you want to use quote characters then you must use double quotes ("$IP"), but there is no reason to do so when the only thing contained in the string is a variable — just use the variable. (This is not completely true: "$foo" is a legitimate way to convert $foo to a string, but that is not necessary here.)

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