Create an array and loop over it in bash

See the fallowing example. Note the use of () after +=.

#!/bin/bash

#Plugins: #AFC | #itsecurity | ...
#https://www.linuxjournal.com/content/bash-arrays
UPDATEFILE=y
if [ "$UPDATEFILE" = "y" ]
then
    PLUGINARR=()
    PLUGINARR+=('https://downloads.wordpress.org/plugin/advanced-custom-fields.5.10.2.zip')
    PLUGINARR+=('https://downloads.wordpress.org/plugin/better-wp-security.8.0.2.zip')
    PLUGINARR+=('https://downloads.wordpress.org/plugin/better-wp-security.8.0.2.zip')
    PLUGINARR+=('https://downloads.wordpress.org/plugin/all-in-one-wp-migration.7.48.zip')
    
    for PLUGIN in ${PLUGINARR[*]}
    do
        printf "   %s\n" $PLUGIN
        BASENAME=$(basename -- $PLUGIN)
        wget -q -O $BASENAME $PLUGIN || curl -O $PLUGIN
    done
fi

#Unzip all zip files

https://www.linuxjournal.com/content/bash-arrays