Question

I’m trying to read data from a text file and assign it to arrays. How could I read exactly 3 lines at a time, and then assign the first line to array $a, second line to array $b, third line to array $c? and then read exactly 3 more lines, etc.

Answer 1

$lines    = file('some_file.txt');
$numLines = count($lines);

for ($i = 0; $i < $numLines; $i += 3) {
    $a[] = $lines[$i];
    $b[] = $lines[$i + 1];
    $c[] = $lines[$i + 2];
}

Note that you’ll want to do some out-of-bounds index error checking, as well. I leave that as an exercise for the OP.