[REF] Replace incorrect usages of array_key_exists when the variable … #17573
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…is not an array with property_exists and also fix the parameter order for an implode statement
Overview
In PHP7.4 there has been a crackdown on where using array_key_exists is actually on an object not an array so I have swapped these out for property_exists and also fixed the paraemeter order on an implode which now if you don't pass the parameters in the correct order it puts out a deprecation notice
ping @eileenmcnaughton @colemanw