SPIP converting string to array and array to string

Sometimes we need to convert an array to the string or make reverse operation: convert a string to the array.

Converting an array to the string in SPIP

[(#SET{string,[(#GET{array}|implode{","})] })]
#GET{string}

Converting a string to the array in SPIP

[(#SET{array,[(#GET{string}|explode{","})]})]
[(#GET{array}|foreach)]
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