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//定义回调函数
function key_compare_func($key1,$key2)
{
if($key1==$key2) //如果两参数相等
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
}
//分别定义两个数组
$array1=array("blue"=>1,"red"=>2,"green"=>3,"purple"=>4);
$array2=array("green"=>5,"blue"=>6,"yellow"=>7,"cyan"=>8);
//用回调函数对键名比较计算数组的差集
$result=var_dump(array_diff_ukey($array1,$array2,"key_compare_func"));
print_r($result);
//输出比较结果
//
$array1=array("a"=>"green","red","blue","red"); //定义数组1
$array2=array("b"=>"green","yellow","red"); //定义数组2
$result=array_diff($array1,$array2); //计算差集
print_r($result); //输出比较结果
//
$result=array_fill(5,6,"banana"); //为数组$a从第5个元素开始添加6个banana
print_r($result); //输出结果
//
function odd($var)
{
return($var%2==1); //如果参数为奇数，返回true，否则返回false
}
function even($var)
{
return($var%2==0); //如果参数为偶数，返回true，否则返回false
}
//分别定义两个数组
$array1=array("a"=>1,"b"=>2,"c"=>3,"d"=>4,"e"=>5);
$array2=array(6,7,8,9,10,11,12);
echo "过滤奇数:n";
print_r(array_filter($array1,"odd")); //过滤数组1中的奇数
echo "过滤偶数:n";
print_r(array_filter($array2,"even")); //过滤数组2中的偶数
//
$trans=array("a"=>1,"b"=>2,"c"=>3); //定义数组
$result=array_flip($trans); //反转数组
print_r($result); //输出反转后的数组
//
$array1=array("a"=>"green","b"=>"brown","c"=>"blue","red");
$array2=array("a"=>"green","yellow","red");
$result_array=array_intersect_assoc($array1,$array2); //交集赋值到$result_array
print_r($result_array); //输出结果数组