<?php
$grades = array('egoing' => 10, 'k8805' => 6, 'sorialgi' => 80);
?>

<?php
$grades = [];
$grades['egoing'] = 10;
$grades['k8805'] = 6;
$grades['sorialgi'] = 80;
?>

• 위, 아래 둘 다 같은 의미

<?php
$grades = array('egoing' => 10, 'k8805' => 6, 'sorialgi' => 80);
foreach($grades as $key => $value) {
	echo "key: {$key} value: {$value}<br />";
}
?>