//建立一個陣列
$arrays = array("name"=>"Job","John","Tom","John",5,2);
//初始狀態
print_r($arrays);
//Array ( [name] => Job [0] => John [1] => Tom [2] => John [3] => 5 [4] => 2 )

//is_array(array) 回傳變數是否為陣列
echo is_array($arrays) ? '$arrays是陣列' : '$arrays不是陣列';
//$arrays是陣列

//array_key_exists(str,array) 回傳變數值是否為陣列裡的索引值
echo array_key_exists('name',$arrays) ? '索引name存在' : '索引name不存在';
//索引name存在
echo array_key_exists(3,$arrays) ? '索引3存在' : '索引3不存在';
//索引3存在

//in_array(str,array) 回傳變數值是否為陣列裡的數值
echo in_array('Job',$arrays) ? 'Job存在' : 'Job不存在';
//Job存在

//count(array) 回傳陣列長度
echo count($arrays);
//6

//array_values(array) 回傳數字索引的陣列
print_r(array_values($arrays));
//Array ( [0] => Job [1] => John [2] => Tom [3] => John [4] => 5 [5] => 2 )

//array_count_values(array) 回傳重覆元素的次數的陣列
print_r(array_count_values($arrays));
//Array ( [Job] => 1 [John] => 2 [Tom] => 1 [5] => 1 [2] => 1 )

//array_reverse(array) 回傳反轉後的順序的陣列
print_r(array_reverse($arrays));
//Array ( [0] => 2 [1] => 5 [2] => John [3] => Tom [4] => John [name] => Job )		

//array_pad(array,length,value) 回傳填充陣列長度
print_r(array_pad($arrays,10,'Mary'));
//Array ( [name] => Job [0] => John [1] => Tom [2] => John [3] => 5 [4] => 2 [5] => Mary [6] => Mary [7] => Mary [8] => Mary )
※蘭さん：原本的陣列長度是6，這裡設定10個，那麼就是要再補上4個Mary。

//array_sum(array) 回傳總和(字串忽略)
echo array_sum($arrays);
//7

//current(array) 回傳目前指標位置的數值
echo current($arrays);
//Job

//array_unique(array) 回傳刪除陣列的重覆值
print_r(array_unique($arrays));
//Array ( [name] => Job [0] => John [1] => Tom [3] => 5 [4] => 2 )

//shuffle($arrays) 不回傳，將陣列的所有元素打亂
shuffle($arrays);
print_r($arrays);
//Array ( [0] => Tom [1] => 5 [2] => Job [3] => John [4] => 2 [5] => John )