get false value in callback function in array_filter

Question

I have an array like this:

Array ( [PlasticContainmentTrained] => 0 [AvoidDustSpreadTrained] => 1 [PostRenCleaningTrained] => 0 [EntranceWarningSign] => 1 [IntObjectCovered] => 1 [IntHVAC] => 0 [IntWindowClosed] => 1 [ExtWindowClosed] => 0 [IntDoorClosed] => 1 [ExtDoorClosed] => 0 [DoorCovered] => 1 [IntFloorCovered] => 0 [ExtGroundCovered] => 1 [ExtVertContainment] => 0 [WasteContained] => 1 [AllChipsDebris] => 0 [WorkAreaSurface] => 0 [DustClearanceTesting] => 1 [WasteHandlingTrained] => 1 [MaintainContainmentTrained] => 0 [PostingWarningSignTrained] => 1 [DescriptionOfRenovation] => bnfdbndljnbljdfnbljkdnfljn [TrainedWorkers] => jvndfjnvdfvjndfljvndfljvn [DustSamplingTechnicanNames] => jvnfjdfnlvjdfjvndfljndflj [QualificationCopies] => dfjvdjf [KitUsed] => vjnjkdsfnvljdnvdjfvndfjbnjgbnndfn [TestLocations] => jdfjnvljndfvjdnfvjdnfvjkfnlj [CertifiedRenPerformed] => fdjndfljvndfljvndfjvndflk [ReportAttachPath] => undefined [IAccept] => undefined [ProjectId] => 1 )

and i want to filter this array but only 'undefined' values not '0'. i have used array_filter() function for this:

function filterValue($var)
        {

            if($var=='0')
            {
                return 0;
            }
            elseif($var!='undefined')
            {
                return $var;
            }
        }
        $this->data = array_filter($_POST, "filterValue");

but it also filters '0' values. how can i do this.

Please any body help me...

Berry Langerak · Accepted Answer · 2012-01-09 08:22:52Z

1

That's because '0' evaluates to boolean false. Just check for undefined, and return false if it is undefined, true if it isn't:

<?php
$data = array_filter( $data, function( $element ) {
  return $element !== 'undefined';
});

answered Jan 9, 2012 at 8:22

Berry Langerak

18.9k5 gold badges49 silver badges62 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

FirstFraktal · Accepted Answer · 2015-07-21 22:31:31Z

You could also create a callback function to reuse like your original example, which helps cut down on repeated code. This custom callback function also trims spaces, and allows you to specify an array of values you don't want filtered out:

// Customized "array_filter" callback to preserve "0" in submitted values:
function empty_array_filter($val) {
    $val = trim($val);
    $allowed_vals = array('0'); // List of values to keep (e.g. these should not be treated as "false").
    return in_array($val, $allowed_vals, true) ? true : ( $val ? true : false );
}

Then use your array filter with your custom callback like so:

// Use the custom callback instead of the default one:
$array_data = array_filter($array_data, 'empty_array_filter');

Collectives™ on Stack Overflow

get false value in callback function in array_filter

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related