php array_intersect is showing no intersection

Question

I have two arrays $t1 and $t2. When I print them out I get the following:

t1:

Array ( [0] => Christina Aguilera [1] => Iron Maiden [2] => Bob Marley ) 

t2:

Array ( [0] => Bob Marley )

I'm trying to get the common elements of the array though the array_intersect function, and I'm using the below line:

$intersection = array_intersect($t1,$t2);

However, for some reason when I print the result $intersection I get get:

Array ( )

Can anybody see what it is going wrong? The code for my function is below but I think the above should be sufficient to work it out.

// For extra information
function findMutualInterests($_uProArray, $_tProArray)
{
    $_commonDetails = null;

    $_fieldNames = array_keys($_uProArray[0]);
    $_uProValues = array_values($_uProArray[0]);
    $_tProValues = array_values($_tProArray[0]);
    //print_r($_uProValues);

    // Iterate over the arrays and find ones in common
    for ($i = 0; $i < count($_uProValues); $i++) {
        $t1 = explode(',',$_uProValues[$i]);
        print_r($t1);
        $t2 = explode(',',$_tProValues[$i]);
        print_r($t2);
        $intersection = array_intersect($t1,$t2);
        print_r($intersection);
        $_commonDetails[$_fieldNames[$i]] = implode($intersection);
    }
    return $_commonDetails;
}

EDIT: Just thought I would point out that the output of $t1 and $t2 shown above are the output of a single iteration of the below function. I just chose that one as an example.

Answer 1

Your code works fine, try trimming input strings.

Answer 2

Your code has a huge mistake. If you have more elements in $_tProValues than in $_uProValues you will not test all possibilities in the $_tProValues array. Then you'll not be able to test all possibilities. What happens here is exactly that, you're not testing all possibilities.

Answer 3

Check the comments above, because this works just fine:

<?php

$a = array (
        0 => 'Christina Aguilera',
        1 => 'Iron Maiden',
        2 => 'Bob Marley'
    );

$b = array (
        0 => 'Bob Marley'
    );

$intersect = array_intersect( $a, $b );

print_r( $intersect );

?>

Output:

Array
(
    [2] => Bob Marley
)

Answer 4

**Check the code it is very useful for you ,because this works fine:**

$final_arr = [];
foreach ($a as $a_val) {
      foreach ($b as $b_val) {
        if(in_array(strtolower($a), array_map('strtolower', $b_val))){
            $final_arr[] = $b_val; 
            }
       }
    }