How to get checkbox values in array in PHP?

Question

I have an image upload form that looks like this: Gallery Screenshot

The code to generate tag checkboxes:

foreach($tag as $tagid => $tagname) {
  echo "<label><input type=\"checkbox\" name=\"img_tags[]\" value=\"".$tagid."\">".$tagname."</label>";
}

Then in PHP I want to read values of this checkboxes for each image. I want img_tags to be 2D array so I can loop over it and check values for each picture. Is this possible?

Output of:

$img_tags = $_POST['img_tags'];↵
foreach($img_tags as $t) {↵
    print_r($t);↵
}↵

is: 12121, which I don't understand at all.

You can use names like for image img_tags[pic1][name] and for tags img_tags[pic1][tags] — Bora
– Bora, Commented Sep 12, 2013 at 7:16
If you Google your exact title, you'll see your question is a duplicate of getting a checkbox array value from POST — Itay
– Itay, Commented Sep 12, 2013 at 7:16

Quentin · Accepted Answer · 2013-09-12 07:15:47Z

0

If you want a 2d array in a $_POST variable then you need to express that in the names.

name="img_tags[level_1_key][]"

answered Sep 12, 2013 at 7:15

Quentin

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2 Comments

maciejjo Over a year ago

Ok, I tried name=\"img_tags[".$counter."][]\" , where $counter is from while loop going through all images, and in PHP to get it : $img_tags = $_POST['img_tags['.$key.']'];. Generated HTML looks fine: name="img_tags[1][]" but I get Undefined index: img_tags[1].

Quentin Over a year ago

That's because it is an array (which is what you asked for). $_POST['img_tags'][1]

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