php-循环普通数组和关联数组

<?php//循环普通数组
$arr=array("杭州","成都","拉萨");
$arrlength=count($arr);
for($x=0;$x<$arrlength;$x++){
echo $arr[$x];
echo "<br>";
}//循环关联数组
$arr1=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
foreach ($arr1 as $x=>$x_value){
echo "Key:". $x.", Value=" . $x_value;
}