使用php合并多个数组

Question

I am currently trying to figure out how to merge a collection of arrays in php.

foreach ($Col as $Row)
{   
    echo("<pre>");
      print_r($Row); // This returns the arrays below
    echo("</pre>");
}  

When I run the foreach statement it returns the following:

Array
(
  [0] => First Name
  [1] => Last Name
  [2] => Username
)

Array
(
  [0] => Bob
  [1] => Dill
  [2] => DBob
)


Array
(
  [0] => Amy
  [1] => Simpson
  [2] => Asimp
)

Array
(
  [0] => Doug
  [1] => James
  [2] => LJames
)

Is there anyway I can merge the following arrays into one array as I am interested in only grabbing the username from all of the arrays and merging them into a new array.

Answer 1

Since you want to get the usernames, could just :

1. point it directly (which is index 2)

2. pop the first array (which looks like a header), search for username which can be used as your marker.

After determining where it its, you can use it in a simple loop. Consider this example:

#1

$values = array( array('First Name', 'Last Name', 'Username'), array('Bob', 'Dill', 'DBob'), array('Amy', 'Simpson', 'Asimp'), array('Doug', 'James', 'LJames'), );
$usernames = array();
array_shift($values);
foreach($values as $key => $value) {
    $usernames[] = $value[2];
}

#2

$values = array( array('First Name', 'Last Name', 'Username'), array('Bob', 'Dill', 'DBob'), array('Amy', 'Simpson', 'Asimp'), array('Doug', 'James', 'LJames'), );
$usernames = array();
$header = array_shift($values);
$username_key = array_search('Username', $header); // find out which column is username
foreach($values as $key => $value) {
    $usernames[] = $value[$username_key];
}

echo '<pre>';
print_r($usernames);
echo '</pre>';

Sample Output:

Array
(
    [0] => DBob
    [1] => Asimp
    [2] => LJames
)