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i am stuck at this stage of my project.
i am trying to get common values from four multidimensional arrays using array_intersect. can anyone help me with this issue ?
here are all four array:
$arr=array(array(8159),array(8140),array(8134),array( 8168),array(8178),array( 8182),array( 8183));
$arr1=array(array(8159),array(8140),array(8134),array(8165),array(8166),array(8167),array( 8168));
$arr2=array(array(566),array(265),array(8134),array(655),array(8166),array(665),array( 8168),array(656),array( 989),array( 989));
$arr3=array(array(8159),array(8140),array(8134),array(8165),array(8166),array(8167),array( 8168));
$res= array_intersect($arr,$arr1,$arr2,$arr3);
print_r($res);
846
The array_intersect() function compares the values of two (or more) arrays, and returns the matches. This function compares the values of two or more arrays, and return an array that contains the entries from array1 that are present in array2, array3, etc.
Size of multidimensional arrays: The total number of elements that can be stored in a multidimensional array can be calculated by multiplying the size of all the dimensions. For example: The array int[][] x = new int[10][20] can store a total of (10*20) = 200 elements.
Now, to check whether two arrays are equal or not, an iteration can be done over the arrays and check whether for each index the value associated with the index in both the arrays is the same or not. PHP has an inbuilt array operator( === ) to check the same but here the order of array elements is not important.
If subarray contain one element always you could chage that value using array_map and current function.
$arr=array(array(8159),array(8140),array(8134),array( 8168),array(8178),array( 8182),array( 8183));
$arr1=array(array(8159),array(8140),array(8134),array(8165),array(8166),array(8167),array( 8168));
$arr2=array(array(566),array(265),array(8134),array(655),array(8166),array(665),array( 8168),array(656),array( 989),array( 989));
$arr3=array(array(8159),array(8140),array(8134),array(8165),array(8166),array(8167),array( 8168));
$arr = array_map('current', $arr); // getting first value of subarray
$arr1 = array_map('current', $arr1);
$arr2 = array_map('current', $arr2);
$arr3 = array_map('current', $arr3);
print_r($arr3);
// Array
// (
// [0] => 8159
// [1] => 8140
// [2] => 8134
// [3] => 8165
// [4] => 8166
// [5] => 8167
// [6] => 8168
// )
$res= array_intersect($arr,$arr1,$arr2,$arr3);
print_r($res);
// Array
// (
// [2] => 8134
// [3] => 8168
// )
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