有趣的几个数组函数

<?php
$a=array("This","is","just","a","test");
echo implode(" ",$a)."<br>";//将数组$a内的元素以空格为间隔，转为字符串，并输出
echo count($a)."<br>";//获取数组长度
if(in_array("just",$a))//查找指定的字符或者字符串是否在指定数组内，是则返回true
 echo "The word 'just' is in this array."."<br>";
else echo "The word 'just' isn't in this array."."<br>";
//有趣的array_search()
$fruits["aoole"]="red";
$fruits["watermelon"]="green";
$founded=array_search("green",$fruits);//返回对应的键值
if($founded)
 printf("%s was founded on %s",$founded,$fruits[$founded]);
?>

结果如下：

This is just a test
5
The word 'just' is in this array.
watermelon was founded on green