PHP array_diff_ukey () function definition and usage

Definition and Usage

The Array_diff_ukey () function is used to compare the key names of two (or more) arrays and return a difference set.

Note: This function uses a user-defined function to compare key names!

The function compares the key names of two (or more) arrays, and returns an array of difference sets that contain all the key names in the array being compared (array1), but not in any other parameter array (array2 or array3, and so on).

Grammar

Array_diff_ukey (array1,array2,array3...,myfunction);

Parameter description

Array1 must have. The first array to compare with the other array.

Array2 must have. The array to compare with the first array.

Array3,... Optional. Other arrays to compare to the first array

MyFunction must have. A string that defines the callable comparison function. If the first parameter is <, =, > The second argument, the corresponding comparison function must return an integer of < =, > 0.

return value:

Returns an array of difference sets that contain all the key names in the array being compared (array1), but not in any other parameter array (array2 or array3, and so on).

Example Show 1:

<! DOCTYPE html>
Operation Result:

Array ([c] = blue)


Example Show 2:

<! DOCTYPE html>
Operation Result:

Array ([c] = blue)