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<html>
<head>
<meta content="width=device-width initial-scale=1.0 minimum-scale=1.0 maximum-scale=1.0 user-scalable=no" name="viewport">
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<style>
pre {
padding: 20px;
}
</style>
</head>
<body>
<pre>
<?php
$wareki = ["明治", "大正", "昭和", "平成", "令和"];
foreach( $wareki as $key => $value ) {
print "{$key} => {$value}\n";
}
print "\n";
for( $i = 0; $i < count( $wareki ); $i++ ) {
print "{$i} => {$wareki[$i]}\n";
}
?>
</pre>
</body>
</html>