PHP在条件语句中比较两个数组

Question

I have two arrays and I want to compare the first with the second array. I have an IF statement and it currently does two checks:

1. It checks to see if there are any rows from my query
2. If the above passes, then I want to traverse the array values of the first array and compare it with the second array. I want to traverse through all the names first array (index 0-9) and compare it with the first name of the second array (index 0). Keep doing the same thing until we've compared all the indices 0-9 on the first array with all indices 0-9 of the second array.
3. Finally, if there is a match I want to exit my PHP script, else if there is no match I continue to do to stuff.

I have tried using the in_array() function and that works, but only with a single variable. Something like this in_array($firstArray[0], $secondArray) works. Something like this:

    if(mysqli_num_rows($result) > 0 && in_array($firstArray[0], $secondArray)){
        exit("exiting now!");
    } 
    else {
        echo "continue to do stuff...";
    }

However, when I put the whole array in the inArray, it won't work. Like this:

in_array($firstArray, $secondArray)

How can I achieve this?

Answer 1

You can use array_intersect if you want to know if they intersect, you can use array_diff to see if the two arrays have any differences.

if(mysqli_num_rows($result) > 0 && !array_diff($firstArray, $secondArray)){
       exit("exiting now!");
} else {
       echo "continue to do stuff...";
}

Example:

<?php
$array1 = array (1,2,3,4);
$array2 = array (3,2,1,5);
$array3 = array_diff($array1, $array2);
$array4 = array_intersect($array1, $array2);
echo "<pre>";
echo "Array 1
 ";
print_r($array1);
echo "Array 2
 ";
print_r($array2);

echo "Arrays Difference 
 ";
print_r($array3);
echo "Arrays intersect 
 ";
print_r($array4);
echo "</pre>";
?>

Output:

Array 1
 Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
)
Array 2
 Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 5
)
Arrays Difference 
 Array
(
    [3] => 4
)
Arrays intersect 
 Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)