array_merge function doesn't work properly in Laravel

Question

In my project i'm split an array index value based on regex value. but when i want merge all array together the merge function doesn't merge.

Here is my code sample.

 $testarray=array();

    $merge_array=array();
    //receive parameter is Admin|Manager,User@Test
    foreach ($roles as $value) {
        if(preg_match("/[@#%$|:\s,]+/",$value))
        {
            $testarray=preg_split("/[@#%$|:\s,]+/",$value);

        }

        print_r(array_merge($merge_array,$testarray));
    }

The print_r show this result.

Array ( [0] => Admin [1] => Manager ) Array ( [0] => User [1] => Test )

Answer 1

You just merge arrays, but don't assign results to any variable, proper code is:

//receive parameter is Admin|Manager,User@Test
foreach ($roles as $value) {
    if(preg_match("/[@#%$|:\s,]+/",$value))
    {
        $testarray=preg_split("/[@#%$|:\s,]+/",$value);
    }

    // here you add $testarray values to 
    // `$merge_array` on each iteration
    $merge_array = array_merge($merge_array,$testarray);
}
// print result array after loop
print_r($merge_array);

Answer 2

The Laravel framework has nothing to do with your issue. You're using PHP's standard functions.

The array_merge function doesn't modify the array you provide to it but provides the resulting array as its output. So you should assign array_merge's result to $merge_array.

Please try the following code:

$testarray = array();

$merge_array = array();
//receive parameter is Admin|Manager,User@Test
foreach ($roles as $value) {
    if(preg_match("/[@#%$|:\s,]+/",$value))
    {
        $testarray = preg_split("/[@#%$|:\s,]+/",$value);

    }

    $merge_array = array_merge($merge_array, $testarray);
}
print_r($merge_array);

Answer 3

You seem to think wrong. print_r(array_merge($merge_array,$testarray)); The above line is in "foreach" loop. In that case, to get a merged result, you should do like the followings; $merge_array = array_merge($merge_array,$testarray)

In your code, $merge_array remains empty, so you see the current result.