array_diff_key(): Difference between two arrays with respect to Keys
Returns all elements of $array1 which are not present in $array2 ($new_array=$array1 without $array2).... Here comparison is done based on the keys only ( NOT values ).
Comparison of two or more arrays are done by using values in array_diff()
Example with two arrays
Output is here.
Keys of the first index are retained. ( no re-indexing done here)
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