PHP: Find empty value in array

Question

I want to display an error if one of the <input> boxes the user has submitted is empty, but I also want to process the boxes that do not have empty names.

Here is the form: http://jsfiddle.net/Draven/rEPXM/27/

PHP:

if(isset($_POST['addFolder']))
{    
    foreach($_POST['folder'] as $id => $value)
    {
        $database->query('INSERT INTO folders (name) VALUES (?)', array($value));
    }
    $success[] = "Folder(s) added";                 
}

var_dump($folder) before if(!empty($folder)). What you get? — zarkoz
– zarkoz, Commented Oct 24, 2012 at 16:00
@insertusernamehere I am using PDO, I don't need to sanitize. — Draven
– Draven, Commented Oct 24, 2012 at 16:01
@zarkoz I added two input boxes, the first one had a name "TEst", the second one was empty. array(2) { [0]=> string(4) "TEst" [1]=> string(0) "" } — Draven
– Draven, Commented Oct 24, 2012 at 16:06

GBD · Accepted Answer · 2012-10-24 16:03:30Z

2

Try as below

foreach($folder as $id => $value)
{
    if($value){
      $database->query('INSERT INTO folders (name) VALUES (?)', array($value));
    }
    else {
       $error[]=$id;
    }
}

$error contains all indexes which doesn't have value.

answered Oct 24, 2012 at 16:03

GBD

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1 Comment

Draven Over a year ago

This'll work. I'll leave out giving an error. Might confuse people anyway. Thank you.

Vadim Ashikhman · Accepted Answer · 2012-10-24 16:11:09Z

2

Try this:

$folder = isset($_POST['folder']) && is_array($_POST['folder'])
        ? $_POST['folder']
        : array();
$errors = array();
foreach ($folder as $id => $value) {
    $value = is_array($value) ? '' : trim($value);
    if ($value == '') {
        $errors[$id] = 'Empty value';
        continue;
    }

    $database->query('INSERT INTO folders (name) VALUES (?)', array($value));
}

Edit your template:

...

<div id="foldercontainer">
<?php foreach ($errors as $error): ?>
    <div>
        <div><?php echo $error ?></div>
        <input name="folder[]" type="text" size="20" value="" />
    </div>
<?php endforeach ?>
</div>

...

answered Oct 24, 2012 at 16:11

Vadim Ashikhman

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Comments

thatidiotguy · Accepted Answer · 2012-10-24 15:58:29Z

0

if(!isset($folder) || $folder === "")

But I do not understand whyyou are running the query if you if $folder is empty...

answered Oct 24, 2012 at 15:58

thatidiotguy

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2 Comments

Draven Over a year ago

That won't process the boxes that DO have names. My code probably confused you. I'll take out my check.

thatidiotguy Over a year ago

I don't understand. If this condition is true, don't do the query. Or just negate the expression if you want to do it the opposite way.

Maykonn · Accepted Answer · 2012-10-24 16:30:22Z

0

Complementing what was said. Use trim() when you want to test if a value is empty. You do not want to name folders with empty values, right?:

$folder = array('aaaa', 'bbbb', ' ', '    ');

foreach($folder as $id => $value) {
    $value = trim($value);

    if(!empty($value)) {
      var_dump($value);
    } else {
       $error[]=$id;
    }
}

On the way up the output will be:

string 'aaaa' (length=4)

string 'bbbb' (length=4)

Now, without using trim() and test if it is not empty, the output is(and it is a mistake):

string 'aaaa' (length=4)

string 'bbbb' (length=4)

string ' ' (length=1)

string '    ' (length=4)

answered Oct 24, 2012 at 16:30

Maykonn

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