PHP 6 basic grammar

// PHP loop

// for loop

for ($i = 0; $i < 18; $i++) {

echo $i . '<br>';

}

// while loop

$l = 0;

while ($l <= 18) {

echo $l . '<br>';

$l++;

}

// foreache () An array of circulating statements

$arr = ['a' => 1, 'b' => 2];

foreach ($arr as $key => $value) {

echo $key . ' ' . $value . '<br>';

}