php數組操作 鍵名比較 差集 交集賦值

//定義回呼函數
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);
//用回呼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);         //輸出反轉後的數組

//

$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