array_key_last(): to get the last key of an array

key = array_key_last ($input_array);
ParameterDESCRIPTION
$input_arrayRequired : Input array for which last key is to be returned.
arrays_key_last() function returns the last key of the array. If the array is empty then NULL is returned.
PHP 7.3.0 Supported by PHP 7.3.0 and above

Example 1

$input=array(1,2,3,4,5);
echo array_key_last($input);
Output is here
4
Note that the first key is 0 , so the last key in above code is 4

Example 2

$input=array('One' =>'First','Two'=>'Second','Three'=>'Third','Fourth');
echo var_dump(array_key_last($input));
The output is here
int(0)


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