如何只迭代数组的前3个元素并访问键/值？

I was trying to assign each seller their monthly points, based on the amount of products they sell. The numbers, however, are just an example. This is my code so far:

$sellers = array(
    'Edvin'   => 10, 
    'Julio'   =>  9, 
    'Rene'    =>  8, 
    'Jorge'   =>  7, 
    'Marvin'  =>  6,
    'Brayan'  =>  5, 
    'Sergio'  =>  4,   
    'Delfido' =>  3, 
    'Jhon'    =>  2
);

$a = 1;
foreach ($sellers as $seller => $points) {
    while ($a < 4) {
        echo "The seller top " . $a . " is " . $sellers[$a - 1] . ' with ' . $points[$a] . '<br>';
        $a++;
    }
}

I am trying to output this:

The seller top 1 is Edvin with 10<br>
The seller top 2 is Julio with 9<br>
The seller top 3 is Rene with 8<br>

You only want to access the first three elements, so slice the array before looping, you can increment the counter as you iterate.

Code: (Demo)

$sellers = array('Edvin' => 10, 'Julio' => 9, 'Rene' => 8, 'Jorge' =>7, 'Marvin' => 6,
                    'Brayan' => 5, 'Sergio' => 4, 'Delfido' => 3, 'Jhon' => 2);

$i = 0;
foreach (array_slice($sellers, 0, 3) as $seller => $points) {
    echo "The seller top " . ++$i . " is $seller with $points<br>";
}

Output:

The seller top 1 is Edvin with 10<br>
The seller top 2 is Julio with 9<br>
The seller top 3 is Rene with 8<br>

If you want to control the loop with the counter and omit the array_slice() call, you will need to write a loop break.

$i = 0;
foreach ($sellers as $seller => $points) {
    echo "The seller top " . ++$i . " is $seller with $points<br>";
    if ($i == 3) break;
}

Why are you using a While Loop inside a foreach Loop ?

You can do this:

$sellers = array(
  'Edvin'   => 10,
  'Julio'   =>  9,
  'Rene'    =>  8,
  'Jorge'   =>  7,
  'Marvin'  =>  6,
  'Brayan'  =>  5,
  'Sergio'  =>  4,
  'Delfido' =>  3,
  'Jhon'    =>  2
);

$a = 1;
foreach (array_flip($sellers) as $points => $seller) {
  if ($a < 4) {
    echo "The seller top " . $a . " is " . $seller . ' with ' . $points . '<br>';
    $a++;
   }
 }

If you want to use a while loop you can do this to:

$sellers = array(
  'Edvin'   => 10,
  'Julio'   =>  9,
  'Rene'    =>  8,
  'Jorge'   =>  7,
  'Marvin'  =>  6,
  'Brayan'  =>  5,
  'Sergio'  =>  4,
  'Delfido' =>  3,
  'Jhon'    =>  2
);

$a = 0;
// Get Associative Keys
$keys = array_keys($sellers);
while($a < 3){
    // Get Assoc INDEX at position
    $index = $keys[$a];

    echo "The seller top " . ($a+1) . " is " . $index . ' with ' . $sellers[$index] . '<br>';
    $a++;
}