up vote 5 down vote favorite
2

Having a bit of a simple moment...

How do I loop through this array and remove any empty values:

[28] => Array
    (
        [Ivory] => 
        [White] => 
    )

[29] => Array
    (
        [Ivory] => 
        [White] => 
    )

[30] => Array
    (
        [Ivory] => 
        [White] => 36
    )

[31] => Array
    (
        [White] => 24
    )

So say it'd remove 28, 29 and just Ivory from 30...

Thanks!

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5 Answers

up vote 2 down vote accepted

I believe this will do what you're looking for:

foreach( $array as $key => $value ) {
    if( is_array( $value ) ) {
        foreach( $value as $key2 => $value2 ) {
            if( empty( $value2 ) ) 
                unset( $array[ $key ][ $key2 ] );
        }
    }
    if( empty( $array[ $key ] ) )
        unset( $array[ $key ] );
}

It will loop through your outer array, descend into any arrays it contains and remove keys whose values are empty. Then, once it's done that, it will remove any keys from the outer array whose subvalues were all empty, too.

Note that it wouldn't work for a generic array, just the one you've provided (two-dimensional).

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Ah, magic... Thanks Ryan :) – christian.thomas Apr 21 '11 at 22:35
up vote 20 down vote

I see you already have a working solution, but just for fun, with array_map goodness:

$array = array_filter(array_map('array_filter', $array));
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1  
No, this is magic! – Kalle H. Väravas Feb 18 '12 at 4:41
3  
black magic indeed! I should point out though that this will only work for nested arrays. reg arrays only need array_filter() without the callback. – Matt K Mar 13 '12 at 14:55
up vote 1 down vote

Another way, using preg_grep:

foreach($array as $key => $subarray) {
    $array[$key] = preg_grep('/^$/', $subarray, PREG_GREP_INVERT);
}

Update: Forgot about removing the empty arrays. The technique shown in @Ryan's answer can also be applied here.

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nice, i've never used preg_grep. i don't think this removes indices 28 and 29 from the array, though? – Ryan Apr 21 '11 at 22:43
@Ryan: True, somehow I forgot about this ;) But you already provided a good answer for how to do it... – Felix Kling Apr 21 '11 at 22:44
up vote 0 down vote 
//Check Array Remove Empty Key
$ixx=0; $ix=0;//Set Array First.
while(end(array_keys($a1))>=$ix){ //Check Last Key in Array
if($a1[$ix]!=""){ //Check Empty Key
    $ax[$ixx]=$a1[$ix];$ixx++; } //Remove Empty Key
$ix++;
}
//End Check Array Remove Empty Key

print_r($ax);//Print Array After remove Empty Key
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This doesn't really address the question, which is dealing with a nested array (an array of arrays). – femtoRgon Oct 10 '12 at 21:21
up vote -1 down vote

You probably need to edit the code below a little.

foreach ($arr as $key => $value) {
  if($value == "") {
     unset($value[$key]);
  }
}
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Hmm, doesn't seem to be working... I put a die; in the if statement, but it doesn't seem to die - I.E. it's not being matched – christian.thomas Apr 21 '11 at 22:31
this won't work, because $value is going to be an array; he wants to remove empty keys whose values are empty from both the inner and outer array – Ryan Apr 21 '11 at 22:32
Yea, it was a short code example to show looping, checking and unsetting. I was working on functional code but you posted the solution before I was done. – Pim Reijersen Apr 21 '11 at 22:41

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