small optim for https://stackoverflow.com/q/54934885/1564365

1-insert.php

$points = [];
for ($x = 0; $x <= 349; $x++) {
    for($y = 0; $y <= 349; $y++) {
        $point = ['x' => $x, 'y' => $y, 'is_water' => false];

        $rgb = imagecolorat($imageResource, $x, $y);

        $r = ($rgb >> 16) & 0xFF;
        $g = ($rgb >> 8) & 0xFF;
        $b = $rgb & 0xFF;

        if ($r === $waterR && $g === $waterG && $b === $waterB) {
            $point['is_water'] = true;
        }
        $points[] = $point;
    }
}
Location::insert($points);

349-inserts.php

for ($x = 0; $x <= 349; $x++) {
    $points = [];
    for($y = 0; $y <= 349; $y++) {
        $point = ['x' => $x, 'y' => $y, 'is_water' => false];

        $rgb = imagecolorat($imageResource, $x, $y);

        $r = ($rgb >> 16) & 0xFF;
        $g = ($rgb >> 8) & 0xFF;
        $b = $rgb & 0xFF;

        if ($r === $waterR && $g === $waterG && $b === $waterB) {
            $point['is_water'] = true;
        }
        $points[] = $point;
    }
    Location::insert($points);
}