How does php determine whether it is an associative array or an indexed array

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Judgment method: 1, use array_values () to convert the specified array into an index array; 2, use array_diff_key () to compare the key names of the original array and the index array, and return a difference array; 3, use empty () to determine whether the difference array is an empty array, if so, the original array is an index array, and vice versa.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Php's method of determining whether an associative array or an indexed array is:

Realize the idea:

Use the array_values () function to get all the key values of the specified array and convert them to an indexed array

Use the array_diff_key () function to compare the key names of the converted indexed array with the original array and return the subtractive array

Use empty () to determine whether the difference array is an empty array, and if the difference array is empty, the original array is an indexed array, otherwise it is an associative array.

Implementation code:

Description:

The array_values () function can get the values of all elements in an array; this function is especially suitable for arrays where the subscripts of the elements are confused, or for converting associative arrays into indexed arrays.

The array_diff_key () function compares the key names of two (or more) arrays and returns an array of subtractions.

If the difference array is an empty array, two (or more) arrays have the same key name.

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