unique array values

Question

I have string of comma separated values.

1,2,3,4,4,4,4,4,4,4,4,01633,4,4

I need to remove the duplicates, so I though of using

array_unique($str);

However, it returns no results. So I decided to output it to see what I have:

print_r($str);
// returns: 1,2,3,4,4,4,4,4,4,4,4,01633,4,4

I'm a little lost. I checked if it is an array and I got true. Here's how that string is created:

$str = '1,2,3';

foreach ($a as $b) {
    $str.= ','.$b;
}

What am I missing here?

65Fbef05 · Accepted Answer · 2011-09-01 16:43:20Z

4

$str = explode(',', $str); // create array
$newArray = array_unique($str); // then process

actually, though... just do your array_unique() on $a before the string is created.

$a = array_unique($a);

then...

foreach ($a as $b) { // and so on

answered Sep 1, 2011 at 16:43

65Fbef05

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3 Comments

Naftali Over a year ago

Or in one line $newArray = array_unique(explode(',', $str)); ^_^

santa Over a year ago

I actually need it as a comma separated values in the end, just no duplicates... Do i have to implode it back then?

65Fbef05 Over a year ago

If you go with the first way I suggested above, you could then create a string with implode(',', $newArray).

zzzzBov · Accepted Answer · 2011-09-01 16:43:50Z

2

Convert to an array, remove the repeat values, convert to string

$str = 'whatever';
$arr = explode( ',', $str );
$newArr = array_unique( $arr );
$newStr = implode( ',', $newArr );

answered Sep 1, 2011 at 16:43

zzzzBov

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2 Comments

santa Over a year ago

I actually tested to see if it was an array: is_array($str) ? 'Array' : 'not an Array'; and got Array...

zzzzBov Over a year ago

@santa, then skip lines 1-2 and use lines 3-4. You shouldn't be storing an array value in a variable named $str.

mfonda · Accepted Answer · 2011-09-01 17:13:01Z

1

Explode on comma, make unique, glue pieces back together:

$str = implode(',', array_unique(explode(',', $str)));

answered Sep 1, 2011 at 17:13

mfonda

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