Create a comma-separated string from a single column of an array of objects

Question

I\'m using a foreach loop to echo out some values from my database, I need to strip the last comma from the last loop if that makes sense.

My loop is just simple, as

Answer 1

<?php
$return = array(any array)
$len = count($return);
$str = '';
$i = 1;
foreach($return as $key=>$value)
{
    $str .= '<a href='.$value['cat_url'].'>'.$value['cat_title'].'</a>';
    if($len > $i)
    {
        $str .= ',';
        $i = $i+1;
    }
}
echo $str;
?>

Answer 2

Not as pretty, but also works:

$first=true;
foreach($results as $result){
    if(!$first) { echo ', '; }
    $first=false;
    echo $result->name;
}

Answer 3

Another smart way is:

foreach($results as $result){
  echo ($passed ? ',' : '') . $result->name;
  $passed = true;
}

In this case at first loop $passed is NULL and , doesn't print.

Answer 4

$result_names = '';
foreach($results as $result){
    $result_names .= $result->name.',';
}
echo rtrim($result_names, ',');

Answer 5

$a[0] = 'John Doe';       
$a[1] = 'Jason statham';       
$a[2] = 'Thomas Anderson';
$size = count($a);
foreach($a as $key=>$name){
    $result .= $name;
    if($size > $key+1) $result .=', ';
}
echo $result;

Answer 6

In modern PHP, array_column() wil allow you to isolate a column of data within an array of objects.

Code: (Demo)

$results = [
    (object)['name' => 'A'],
    (object)['name' => 'B'],
    (object)['name' => 'C']
];

echo implode(',', array_column($results, 'name'));

Output:

A,B,C

That said, since you are iterating a result set, then you may be better served by calling a CONCAT() function in your sql, so that the values are already joined in the single value result set.