Replacing null values in PHP array

Question

A common question, but other answers aren't always clear, so I apologise if this has cropped up elsewhere a million times.

Simple; I have null values returning in my array from a query, I want to cycle through and replace them with zero. I've been trying with the following code;

$stat = $db->getUserStats($id, $code, $mod1, $mod2);    
        foreach ($stat as $key => $value) {
            if ($value == null) {
                $value = 0;
            }
        };

Answer 1

Use a reference:

foreach ($stat as $key => &$value) {

The $value you currently have in if ($value == null) is not the actual array value, but a copy created by foreach .

You should unset the reference after the foreach loop. (See the Warning box in the foreach documentation .)

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Another possible way to accomplish this is to use an expression in your query to returns zeroes instead of nulls. That will vary depending on which database you're using.