unset xP_Array
declare -a xP_Array
...
export LOG=$HOME/BIN/somelogfile
export OUT=/path/to/device
...
echo "`date '+%m/%d/%y %T:'` START -- MEM"                          >> $LOG

echo "`date '+%m/%d/%y %T:'` Go to work directory."                                              >> $LOG
cd ${OUT}

echo "`date '+%m/%d/%y %T:'` Fill the array."                                                   >> $LOG
for f in "$OUT"/*XML; do
    xP_Array+=( "${f#$OUT/}" )
done
echo "`date '+%m/%d/%y %T:'` Get array length."                                               >> $LOG
Plen=${#xP_Array[@]}

echo "`date '+%m/%d/%y %T:'` MEM: $Plen FILES TO PROCESS."                                      >> $LOG

echo "`date '+%m/%d/%y %T:'` Check if zero files."                                               >> $LOG
date_fmt='%m/%d/%y %T'
if (( Plen = 0 ))
then
    printf "%($date_fmt)T: ZERO FILESn" $(date +%s)                                            >> $LOG
fi

echo "`date '+%m/%d/%y %T:'` Loop."                                                             >> $LOG
for i in "${xP_Array[@]}"
do
        echo "`date '+%m/%d/%y %T:'` Move file to run directory."                              >> $LOG
        mv $OUT/$i RUN/
        echo "`date '+%m/%d/%y %T:'` PROCESSING "$i"."                                          >> $LOG
        [[[DATABASE LOAD DONE HERE]]]
        echo "`date '+%m/%d/%y %T:'` Check DB LOAD return value."                                       >> $LOG
        EXIT=`echo $?`
        case $EXIT in
                0) echo "`date '+%m/%d/%y %T:'` COMPLETE."                                      >> $LOG
                mv RUN/"$i" "$ARCH"
                ;;
                *) echo "`date '+%m/%d/%y %T:'` ERROR. "$i" MOVED TO RECON."                    >> $LOG
                mv RUN/"$i" "$RECON"
                ;;
        esac
done

echo "`date '+%m/%d/%y %T:'` END -- MEM"                                    >> $LOG

for f in "$OUT"/*XML; do
    xP_Array+=( "${f#$OUT/}" )
done

pushd "$OUT"
xP_Array=( *XML )
popd

SECONDS=$(date +%s)
for i in "${xP_Array[@]}"
do
    echo "$SECONDS: Move file to run directory." >> $LOG
    # etc
done

printf "%(%m/%d/%Y %T)T" $SECONDS