PHP array_keys() 实例 - 自学教程(runoops.com)

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP array_keys() 实例 - 自学教程(runoops.com)</title>
</head>
<body>
​
<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");
echo '<pre>';
print_r(array_keys($a));
echo '</pre>';
?>
​
</body>
​
</html>