PHP: Concatenate array element into string with ',' as the separator

Question

Is there a quick way ( existing method) Concatenate array element into string with ',' as the separator? Specifically I am looking for a single line of method replacing the following routine:

//given ('a','b','c'), it will return 'a,b,c'
private static function ConstructArrayConcantenate($groupViewID)
{
    $groupIDStr='';
    foreach ($groupViewID as $key=>$value) {
        $groupIDStr=$groupIDStr.$value;
        if($key!=count($groupViewID)-1)
            $groupIDStr=$groupIDStr.',';
    }       

    return $groupIDStr;
}

Artelius · Accepted Answer · 2009-09-07 00:53:06Z

46

This is exactly what the PHP implode() function is for.

Try

$groupIDStr = implode(',', $groupViewID);

answered Sep 7, 2009 at 0:53

Artelius

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3 Comments

Olie Over a year ago

Excellent. Is there a variation that does implode, but start at $groupViewID[3] and go to the end? Thanks!

Artelius Over a year ago

What you need to do is create a new array which contains everything from $groupViewID[3] to the end, and provide that to implode. In the above example, you can just replace $groupViewID with array_slice($groupViewID, 3).

DarkWingDuck Over a year ago

Using PHP since the beginning. I still find parameter orders unnatural. I'd expect the subject first, like join [array] (with) [seperator], as the array is the most significant element in the operation.

Community · Accepted Answer · 2023-11-17 20:38:18Z

9

You want implode:

implode(',', $array);

https://www.php.net/implode

edited Nov 17, 2023 at 20:38

CommunityBot

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answered Sep 7, 2009 at 0:52

carl

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Comments

c_harm · Accepted Answer · 2009-09-07 00:52:49Z

7

implode()

$a = array('a','b','c');
echo implode(",", $a); // a,b,c

answered Sep 7, 2009 at 0:52

c_harm

Comments

karim79 · Accepted Answer · 2009-09-07 00:53:10Z

7

$arr = array('a','b','c');
$str = join(',',$arr);

join is an alias for implode, however I prefer it as it makes more sense to those from a Java or Perl background (and others).

answered Sep 7, 2009 at 0:53

karim79

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2 Comments

carl Over a year ago

Even though join is correct as well, I think most PHP developers are used to seeing implode instead. :)

karim79 Over a year ago

@Carl Vondrick - all the more reason to use join() IMO, but I can understand that PHP developers would prefer to use implode(), as it does sound cooler.

Tareq · Accepted Answer · 2009-09-07 06:05:51Z

1

implode() function is the best way to do this. Additionally for the shake of related topic, you can use explode() function for making an array from a text like the following:

$text = '18:09:00'; $t_array = explode(':', $text);

answered Sep 7, 2009 at 6:05

Tareq

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Comments

gxthegreat · Accepted Answer · 2014-05-15 12:13:54Z

1

You can use implode() even with empty delimeter: implode(' ', $value); pretty convenient.

answered May 15, 2014 at 12:13

gxthegreat

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