从对象数组的单列创建逗号分隔的字符串

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 below

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

Which echos out

result,result,result,result,

I just need to kill that pesky last comma.

Answer 1

Better:

$resultstr = array();
foreach ($results as $result) {
  $resultstr[] = $result->name;
}
echo implode(",",$resultstr);

Answer 2

1. Concat to string but add | before

$s = '';
foreach ($results as $result) { 
    if ($s) $s .= '|';
    $s .= $result->name; 
}
echo $s;

2. Echo | only if not last item

$s = '';
$n = count($results);
foreach ($results as $i => $result) { 
    $s .= $result->name;
    if (($i+1) != $n) $s .= '|';
}
echo $s;

3. Load to array and then implode

$s = array();
foreach ($results as $result) { 
    $s[] = $result->name;
}
echo implode('|', $s);

4. Concat to string then cut last | (or rtrim it)

$s = '';
foreach ($results as $result) { 
    $s .= $result->name . '|';
}
echo substr($s, 0, -1); # or # echo rtrim($s, '|');

5. Concat string using array_map()

echo implode('|', array_map(function($result) { return $result->name; }, $results));

Answer 3

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

Answer 4

I've been having the same issue with this similar problem recently. I fixed it by using an increment variable $i, initializing it to 0, then having it increment inside the foreach loop. Within that loop place an if, else, with the echo statement including a comma if the $i counter is less than the sizeof() operator of your array/variable.

I don't know if this would fix your issue per se, but it helped me with mine. I realize this question is years-old, but hopefully this will help someone else. I'm fairly new to PHP so I didn't quite understand a lot of the Answers that were given before me, though they were quite insightful, particularly the implode one.

$i=0;
foreach ($results as $result) {
    $i++;
    if(sizeof($results) > $i) {
        echo $result . ", ";
    } else {
        echo $result;
    }
}

Answer 5

$string = "";
while ($row = mysql_fetch_array($result)) {
  $string .= $name . ', ';
}
echo substr($string, 0, strlen($string) - 2);

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.

Answer 7

$arraySize = count($results);
for($i=0; $i<$arraySize; $i++)
{
  $comma = ($i<$arraySize) ? ", " : "";
  echo $results[$i]->name.$comma;
}

Answer 8

Not as pretty, but also works:

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

Answer 9

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 10

I know this is an old thread, but this came up recently and I thought I'd share my alternate, cleaner way of dealing with it, using next().

$array = array("A thing", "A whatsit", "eighty flange oscillators");
          
foreach( $array as $value ){
    echo $value;
    $nxt = next($array);
    if($nxt) echo ", "; // commas between each item in the list
    else echo ". And that's it."; // no comma after the last item.
}

// outputs: 
// A thing, A whatsit, eighty flange oscillators. And that's it.

play with it here

Answer 11

I have to do this alot because I'm always trying to feed numbers in to jplot, I find its easier to put the comma in the front of the loop like so:

foreach($arrayitem as $k){ $string =  $string.",".$k;
 } 

and then chop off the first character (the comma) using substr, it helps if you know a guestimate of long your string will be, I'm not sure what the limit on substr max character is.

 echo substr($a,1,10000000);

hope this helps.

Answer 12

$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 13

<?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 14

<?php
$i = 1;
$count = count( $results );
foreach( $results as $result ) {
    echo $result->name;
    if ( $i < $count ) echo ", ";                               
    ++$i;
}
?>

Answer 15

This is what I normally do, add a comma before the item rather than after, while ignoring the first loop.

$i = 0;
$string = '';

foreach($array as $item){
    $string .= ($i++ ? ',' : '').$item;
}

Answer 16

First get all the output by using output buffering. Then, trim the comma and display it. So, do it like this:

ob_start();
foreach($results as $result)
{
   echo $result->name.',';
}
$output = ob_get_clean();

echo rtrim($output, ',');

The output buffering method helps if the inside loop is very big (and OP is posting here just for brevity), then using OB is easier without changing the internals of the loop.