attempt to use array_map in a class is resulting in a warning

Question

A new class has been created for a PHP project as follows:

class Cleanse
{

    # trims leading and trailing spaces
    public static function trimmer($values)
    {       
        return is_array($values) ?
                    array_map('trimmer', $values) :
                    trim($values);
    }

}

However, when trying to use this functionality like so:

$values = Cleanse::trimmer($_POST);

the following warning message is returned: Warning: array_map() expects parameter 1 to be a valid callback, function 'trimmer' not found or invalid function name in (class file path) on line 41.

What is wrong with this code and/or this approach?

Phil · Accepted Answer · 2014-03-06 02:35:34Z

2

As trimmer is a static method of Cleanse, it should be

array_map('Cleanse::trimmer', $values) // PHP >= 5.2.3

or

array_map(array('Cleanse', 'trimmer'), $values) // PHP < 5.2.3

See Callbacks for the correct syntax to use for callbacks.

answered Mar 6, 2014 at 2:35

Phil

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