I want a more efficient way of referencing and loading data into an array without using multiple array variables(a,b,c etc..) Is that called a multidimensional array?

while($num<10) {
    $num++;
    $data1="some random data from source 1";
    $data2="some random data from source 1";
    $data3="some random data from source 1";

    $a($num)=$data1;
    $b($num)=$data2;
    $c($num)=$data3;
}
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