php array_intersect is showing no intersection [closed]

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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.

Are you sure you don't have extra whitespace at the end maybe? Have you tried using trim() before inserting the values in the arrays? — netcoder
– netcoder, Commented Aug 27, 2012 at 21:56
hi netcoder - I'm not manually inserting the values into the arrays at any point. The arrays are the result of an FQL query (Facebook query), so I assume that they have good form. — user1058210
– user1058210, Commented Aug 27, 2012 at 21:58
What is the output of var_dump($intersection)? var_dump shows the type and length of all variables. — Jocelyn
– Jocelyn, Commented Aug 27, 2012 at 21:59
Hi Jocelyn - the result of that line is: array(0) { } array(0) { } array(0) { } array(0) { } array(0) { } array(0) { } array(0) { } — user1058210
– user1058210, Commented Aug 27, 2012 at 22:01
I'm sorry, what is actually needed is to check the output of var_dump($t1); and var_dump($t2); — Jocelyn
– Jocelyn, Commented Aug 27, 2012 at 22:10

moonwave99 · Accepted Answer · 2012-08-27 22:10:16Z

2

Your code works fine, try trimming input strings.

answered Aug 27, 2012 at 22:10

moonwave99

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brunoais · Accepted Answer · 2012-08-27 22:08:35Z

1

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.

answered Aug 27, 2012 at 22:08

brunoais

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Peon · Accepted Answer · 2012-08-27 22:08:37Z

0

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
)

answered Aug 27, 2012 at 22:08

Peon

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Saravanan Nandhan · Accepted Answer · 2016-09-22 07:25:00Z

0

**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; 
            }
       }
    }

answered Sep 22, 2016 at 7:25

Saravanan Nandhan

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