Modify empty values in array [duplicate]

Question

I want modify null values in an array(). I only want to modify, not to clean them.

$arr = array ( 'a' => '', 'b' => 'Apple', 'C' => 'Banana');

I want modify and obtain this:

array(a => 'N', b => Apple, C => 'Banana');

I try array_walk() and array_filter(). But empty values are removed.

And I obtain :

array('b' => 'Apple', 'C' => 'Banana');

show your array_walk attempt...

Aaron W.
– Aaron W.

2012-07-19 12:24:37 +00:00
Commented Jul 19, 2012 at 12:24 — Aaron W.
– Aaron W., Commented Jul 19, 2012 at 12:24

mdziekon · Accepted Answer · 2012-07-19 12:23:43Z

3

array_walk($arr, function(&$val)
{
    if($val == null)
    {
        $val = 'N';
    }
});

This code works perfectly fine on my machine.

answered Jul 19, 2012 at 12:23

mdziekon

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9 Comments

Matthew Wilcoxson Over a year ago

and you might also want to add ( || $val == '' )

user1454661 Over a year ago

I think OP meant empty instead of null given his example.

mdziekon Over a year ago

'' in PHP is considered as NULL (of course if we don't compare types), but there is no problem in changing that.

zourite Over a year ago

Ok works fine with NULL but not with ''. o_O I'm going to look more closely.

mdziekon Over a year ago

@zourite, if you are using $val === null the interpreter will also check type of the $val (so it has to be "real" NULL). And as @Alex said, you can also use if(empty($val)).

|

Peon · Accepted Answer · 2012-07-19 12:39:18Z

1

You can also do like this:

$arr = array ( 'a' => '', 'b' => 'Apple', 'C' => 'Banana' );

foreach ( $arr as $key => $value ) {
    if ( !$value ) $value = 'N';
    $new_arr[ $key ] = $value;
}

print_r( $new_arr );

Output:

Array
(
    [a] => N
    [b] => Apple
    [C] => Banana
)

edited Jul 19, 2012 at 12:39

answered Jul 19, 2012 at 12:25

Peon

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5 Comments

mdziekon Over a year ago

Why don't you use reference like this: foreach($arr as &$value)?

mdziekon Over a year ago

Why you need that? When you use reference, you don't need $key to change the original array, because simple $value = 'N'; will do that.

Peon Over a year ago

I'm not changing the original here, but creating a new one ;)

mdziekon Over a year ago

Aww right. OP asked for modifying original array, so that why I was asking these questions :)

Peon Over a year ago

It's better to keep the original somewhere and use a new modified. That way you can always go back to the original values if needed.

score 0 · Accepted Answer · 2012-07-19 13:52:21Z

0

foreach ($yourArray as $k=>&$v) {
    if (empty($v)) {
        $v = 'N';
    }
}

edited Jul 19, 2012 at 13:52

answered Jul 19, 2012 at 12:26

user1454661

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