1--TEST-- 2Test array_diff_key() function : usage variation - Passing float indexed array 3--FILE-- 4<?php 5echo "*** Testing array_diff_key() : usage variation ***\n"; 6 7// Initialise function arguments not being substituted (if any) 8$input_array = array(0 => '0', 10 => '10', -10 => '-10', 20 =>'20', -20 => '-20'); 9$float_indx_array = array(0.0 => '0.0', 10.5 => '10.5', -10.5 => '-10.5', 0.5 => '0.5'); 10 11echo "\n-- Testing array_diff_key() function with float indexed array --\n"; 12// loop through each element of the array for arr1 13var_dump( array_diff_key($input_array, $float_indx_array) ); 14var_dump( array_diff_key($float_indx_array, $input_array) ); 15?> 16--EXPECT-- 17*** Testing array_diff_key() : usage variation *** 18 19-- Testing array_diff_key() function with float indexed array -- 20array(2) { 21 [20]=> 22 string(2) "20" 23 [-20]=> 24 string(3) "-20" 25} 26array(0) { 27} 28