getting a checkbox array value from POST

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i am posting an array of checkboxes. and i cant get it to work. i didnt include the proper syntax in the foreach loop to keep it simple. but it is working. i tested in by trying to do the same thing with a text field instead of a checkbox and it worked with the textfield.

<form method="post">
<?php 
foreach{
echo'
<input id="'.$userid.'" value="'.$userid.'"  name="invite[]" type="checkbox">
<input type="submit">';
}
?>
</form>

here is the part that is not working. it is echoing 'invite' instead of array.

<?php
    if(isset($_POST['invite'])){
$invite = $_POST['invite'];
echo $invite;
}

Answers

Your $_POST array contains the invite array, so reading it out as

<?php
if(isset($_POST['invite'])){
  $invite = $_POST['invite'];
  echo $invite;
}
?>

won't work since it's an array. You have to loop through the array to get all of the values.

<?php
if(isset($_POST['invite'])){
  if (is_array($_POST['invite'])) {
    foreach($_POST['invite'] as $value){
      echo $value;
    }
  } else {
    $value = $_POST['invite'];
    echo $value;
  }
}
?>

Sunday, October 23, 2022

acodexpetkov-9e27e996b9d1

Change the names of your inputs:

<input name="xyz[]" value="Lorem" />
<input name="xyz[]" value="ipsum"  />
<input name="xyz[]" value="dolor" />
<input name="xyz[]" value="sit" />
<input name="xyz[]" value="amet" />

Then:

$_POST['xyz'][0] == 'Lorem'
$_POST['xyz'][4] == 'amet'

If so, that would make my life ten times easier, as I could send an indefinite amount of information through a form and get it processed by the server simply by looping through the array of items with the name "xyz".

Note that this is probably the wrong solution. Obviously, it depends on the data you are sending.

Monday, August 8, 2022

binoculars-72091074236f

Instead of checking !isset(), use empty(). If the form posts an empty string, it will still show up in the $_POST as an empty string, and isset() would return TRUE.

I've replaced your incremental for loop with a foreach loop, which is almost always used in PHP for iterating an array.

$out_data = array();
foreach ($form_data as $key) {
    if(empty($_POST[$key])) {
        $out_data[$key] = "NO_DATA";
    }
    else {
        $out_data[$key] = $_POST[$key];
    }
}

Friday, August 12, 2022

mikhail_timofeev

Use array-like fields:

<input name="name_for_the_items[]"/>

You can loop through the fields:

foreach($_POST['name_for_the_items'] as $item)
{
  //do something with $item
}

Wednesday, August 17, 2022

jacek_wysocki

The problem arises if you set the checked property of your checkbox to null or undefined.

Those are a "falsy" values in JS, however React treats a value of null as if the property was not set at all. Since the default state of a checkbox is unchecked, everything will work fine though. If you then set checked to true React thinks the property suddenly comes into existence! This is when React figures you switched from uncontrolled to controlled, since now the prop checked exists.

In your example you can get rid of this warning by changing checked={this.settings[setting]} to checked={!!this.settings[setting]}. Notice the double bang (!!). They will convert null or undefined to false (and leave true alone), so React will register your checked property with a value of false and start off with a controlled form component.

I had this problem too and I, too, read the docs about controlled-components several times to no avail, but I finally figured it out, so I thought I'd share. Also, since version 15.2.0 normal inputs are triggered to be controlled by setting value, while checkboxes are initialized as controlled by setting checked, regardless of their value property, which added a bit to the confusion.

Monday, September 5, 2022

info-ea668f911b02

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getting a checkbox array value from POST

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