//定義回調函數
function key_compare_func($key1,$key2)
{
? if($key1==$key2)???????? //如果兩參數相等
? return 0;????????? //返回0
? else if($key1>$key2)??????? //如果$key1>$key2
? return 1;????????? //返回1
? else?????????? //如果$key1<$key2
? return -1;????????? //返回-1
}
//分別定義兩個數組
$array1=array('blue'=>1,'red'=>2,'green'=>3,'purple'=>4);
$array2=array('green'=>5,'blue'=>6,'yellow'=>7,'cyan'=>8);
//用回調函數對鍵名比較計算數組的差集
$result=var_dump(array_diff_ukey($array1,$array2,'key_compare_func'));
print_r($result);
//輸出比較結果
????????
$array1=array("a"=>"green","red","blue","red");???? //定義數組1
$array2=array("b"=>"green","yellow","red");???? //定義數組2
$result=array_diff($array1,$array2);?????? //計算差集
print_r($result);?????????? //輸出比較結果

//
$result=array_fill(5,6,'banana');??? //為數組$a從第5個元素開始添加6個banana
print_r($result);?????? //輸出結果
//
function odd($var)
{
? return($var%2==1);???? //如果參數為奇數,返回true,否則返回false
}
function even($var)
{
? return($var%2==0);???? //如果參數為偶數,返回true,否則返回false
}
//分別定義兩個數組
$array1=array("a"=>1,"b"=>2,"c"=>3,"d"=>4,"e"=>5);
$array2=array(6,7,8,9,10,11,12);
echo "過濾奇數:n";
print_r(array_filter($array1,"odd"));?? //過濾數組1中的奇數
echo "過濾偶數:n";
print_r(array_filter($array2,"even"));?? //過濾數組2中的偶數
//
$trans=array("a"=>1,"b"=>2,"c"=>3);???? //定義數組
$result=array_flip($trans);?????? //反轉數組
print_r($result);???????? //輸出反轉后的數組
//
$array1=array("a"=>"green","b"=>"brown","c"=>"blue","red");
$array2=array("a"=>"green","yellow","red");
$result_array=array_intersect_assoc($array1,$array2);? //交集賦值到$result_array
print_r($result_array);??????? //輸出結果數組PHP學習