Php array operation key name comparison difference set intersection value

// Define the callback function
Function key_compare_func ($ key1, $ key2)
{
If ($ key1 = $ key2) // if the two parameters are equal
Return 0; // return 0
Else if ($ key1> $ key2) // if $ key1> $ key2
Return 1; // return 1
Else // if $ key1 <$ key2
Return-1; // return-1
}
// Define two arrays respectively
$ Array1 = array ('blue' => 1, 'Red' => 2, 'green' => 3, 'Purple '=> 4 );
$ Array2 = array ('green' => 5, 'blue' => 6, 'yellow' => 7, 'cya' => 8 );
// Use the callback function to compare the difference set of the calculated array with the key name
$ Result = var_dump (array_diff_ukey ($ array1, $ array2, 'Key _ compare_func '));
Print_r ($ result );
// Output the comparison result
         
         
//
$ Array1 = array ("a" => "green", "red", "blue", "red"); // defines array 1
$ Array2 = array ("B" => "green", "yellow", "red"); // defines array 2
$ Result = array_diff ($ array1, $ array2); // calculate the difference set
Print_r ($ result); // outputs the comparison result

//

$ Result = array_fill (5th, 'banana '); // add 6 banana entries from the first element of array $
Print_r ($ result); // output result

//

Function odd ($ var)
{
Return ($ var % 2 = 1); // if the parameter is odd, true is returned; otherwise, false is returned.
}
Function even ($ var)
{
Return ($ var % 2 = 0); // if the parameter is an even number, true is returned; otherwise, false is returned.
}
// Define two arrays respectively
$ Array1 = array ("a" => 1, "B" => 2, "c" => 3, "d" => 4, "e" => 5 );
$ Array2 = array (6, 7, 8, 9, 10, 11, 12 );
Echo "filter odd: n ";
Print_r (array_filter ($ array1, "odd"); // filter odd numbers in array 1
Echo "filter even numbers: n ";
Print_r (array_filter ($ array2, "even"); // filter the even numbers in array 2

//

$ Trans = array ("a" => 1, "B" => 2, "c" => 3); // define an array
$ Result = array_flip ($ trans); // reverse the array
Print_r ($ result); // Array after inverted output

//

$ Array1 = array ("a" => "green", "B" => "brown", "c" => "blue", "red ");
$ Array2 = array ("a" => "green", "yellow", "red ");
$ Result_array = array_intersect_assoc ($ array1, $ array2); // The intersection value is $ result_array.
Print_r ($ result_array); // output result array