How to read if a checkbox is checked in PHP?
PhpHtmlFormsPostCheckboxPhp Problem Overview
How to read if a checkbox is checked in PHP?
Php Solutions
Solution 1 - Php
If your HTML page looks like this:
<input type="checkbox" name="test" value="value1">
After submitting the form you can check it with:
isset($_POST['test'])
or
if ($_POST['test'] == 'value1') ...
Solution 2 - Php
Zend Framework use a nice hack on checkboxes, which you can also do yourself:
Every checkbox generated is associated with a hidden field of the same name, placed just before the checkbox, and with a value of "0". Then if your checkbox as the value "1", you'll always get the '0' or '1' value in the resulting GET or POST
<input type="hidden" name="foo" value="0" />
<input type="checkbox" name="foo" value="1">
Solution 3 - Php
When using checkboxes as an array:
<input type="checkbox" name="food[]" value="Orange">
<input type="checkbox" name="food[]" value="Apple">
You should use in_array():
if(in_array('Orange', $_POST['food'])){
echo 'Orange was checked!';
}
Remember to check the array is set first, such as:
if(isset($_POST['food']) && in_array(...
Solution 4 - Php
Let your html for your checkbox will be like
<input type="checkbox" name="check1">
Then after submitting your form you need to check like
if (isset($_POST['check1'])) {
// Checkbox is selected
} else {
// Alternate code
}
Assuming that check1 should be your checkbox name.And if your form submitting method is GET then you need to check with $_GET variables like
if (isset($_GET['check1'])) {
// Checkbox is selected
}
Solution 5 - Php
$check_value = isset($_POST['my_checkbox_name']) ? 1 : 0;
Solution 6 - Php
I've been using this trick for several years and it works perfectly without any problem for checked/unchecked checkbox status while using with PHP and Database.
HTML Code: (for Add Page)
<input name="status" type="checkbox" value="1" checked>
Hint: remove checked if you want to show it as unchecked by default
HTML Code: (for Edit Page)
<input name="status" type="checkbox" value="1"
<?php if ($row['status'] == 1) { echo "checked='checked'"; } ?>>
PHP Code: (use for Add/Edit pages)
$status = $_POST['status'];
if ($status == 1) {
$status = 1;
} else {
$status = 0;
}
Hint: There will always be empty value unless user checked it. So, we already have PHP code to catch it else keep the value to 0. Then, simply use the $status variable for database.
Solution 7 - Php
To check if a checkbox is checked use empty()
When the form is submitted, the checkbox will ALWAYS be set, because ALL POST variables will be sent with the form.
Check if checkbox is checked with empty as followed:
//Check if checkbox is checked
if(!empty($_POST['checkbox'])){
#Checkbox selected code
} else {
#Checkbox not selected code
}
Solution 8 - Php
You can check the corresponding value as being set and non-empty in either the $_POST or $_GET array depending on your form's action.
i.e.: With a POST form using a name of "test" (i.e.: <input type="checkbox" name="test"> , you'd use:
if(isset($_POST['test']) {
// The checkbox was enabled...
}
Solution 9 - Php
Learn about isset which is a built in "function" that can be used in if statements to tell if a variable has been used or set
Example:
if(isset($_POST["testvariabel"]))
{
echo "testvariabel has been set!";
}
Solution 10 - Php
Well, the above examples work only when you want to INSERT a value, not useful for UPDATE different values to different columns, so here is my little trick to update:
//EMPTY ALL VALUES TO 0
$queryMU ='UPDATE '.$db->dbprefix().'settings SET menu_news = 0, menu_gallery = 0, menu_events = 0, menu_contact = 0';
$stmtMU = $db->prepare($queryMU);
$stmtMU->execute();
if(!empty($_POST['check_menus'])) {
foreach($_POST['check_menus'] as $checkU) {
try {
//UPDATE only the values checked
$queryMU ='UPDATE '.$db->dbprefix().'settings SET '.$checkU.'= 1';
$stmtMU = $db->prepare($queryMU);
$stmtMU->execute();
} catch(PDOException $e) {
$msg = 'Error: ' . $e->getMessage();}
}
}
}
<input type="checkbox" value="menu_news" name="check_menus[]" />
<input type="checkbox" value="menu_gallery" name="check_menus[]" />
....
The secret is just update all VALUES first (in this case to 0), and since the
Solution 11 - Php
You can do it with the short if:
$check_value = isset($_POST['my_checkbox_name']) ? 1 : 0;
or with the new PHP7 Null coalescing operator
$check_value = $_POST['my_checkbox_name'] ?? 0;
Solution 12 - Php
$is_checked = isset($_POST['your_checkbox_name']) &&
$_POST['your_checkbox_name'] == 'on';
Short circuit evaluation will take care so that you don't access your_checkbox_name when it was not submitted.
Solution 13 - Php
A minimalistic boolean check with switch position retaining
<?php
$checked = ($_POST['foo'] == ' checked');
?>
<input type="checkbox" name="foo" value=" checked"<?=$_POST['foo']?>>
Solution 14 - Php
<?php
if (isset($_POST['add'])) {
$nama = $_POST['name'];
$subscribe = isset($_POST['subscribe']) ? $_POST['subscribe'] : "Not Checked";
echo "Name: {$nama} <br />";
echo "Subscribe: {$subscribe}";
echo "<hr />";
}
?>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="POST" >
<input type="text" name="name" /> <br />
<input type="checkbox" name="subscribe" value="news" /> News <br />
<input type="submit" name="add" value="Save" />
</form>
Solution 15 - Php
<form>
<input type="check" id=chk1 value="1">
<input type="check" id=chk2 value="1">
<input type="check" id=chk3 value="1">
</form>
when you check on chk2 you can see values as:
<?php
foreach($_POST as $key=>$value)
{
if(isset($key))
$$key=strip_tags($value);
}
insert into table (chk1,chk2,chk3) values ('','1','');
?>
Solution 16 - Php
in BS3 you can put
<?php
$checked="hola";
$exenta = $datosOrdenCompra[0]['exenta'];
var_dump($datosOrdenCompra[0]['exenta']);
if(isset($datosOrdenCompra[0]['exenta']) and $datosOrdenCompra[0]['exenta'] == 1){
$checked="on";
}else{
$checked="off";
}
?>
<input type="checkbox" id="exenta" name="exenta" <?php echo $checked;?> > <span class="label-text"> Exenta</span>
Please Note the usage of isset($datosOrdenCompra[0]['exenta'])
Solution 17 - Php
Wordpress have the checked() function.
Reference: https://developer.wordpress.org/reference/functions/checked/
checked( mixed $checked, mixed $current = true, bool $echo = true )
Description Compares the first two arguments and if identical marks as checked
Parameters $checked (mixed) (Required) One of the values to compare
$current (mixed) (Optional) (true) The other value to compare if not just true Default value: true
$echo (bool) (Optional) Whether to echo or just return the string Default value: true
Return #Return (string) html attribute or empty string
Solution 18 - Php
filter_input(INPUT_POST, 'checkbox_name', FILTER_DEFAULT, FILTER_FORCE_ARRAY)
Solution 19 - Php
<?php
if(isset($_POST['nameCheckbox'])){
$_SESSION['fr_nameCheckbox'] = true;
}
?>
<input type="checkbox" name="nameCheckbox"
<?php
if(isset($_SESSION['fr_nameCheckbox'])){
echo 'checked';
unset($_SESSION['fr_nameCheckbox']);
}
?>
Solution 20 - Php
you should give name to your input . then which box is clicked you will receive 'on' in your choose method
Array
(
[shch] => on
[foch] => on
[ins_id] => #
[ins_start] => شروع گفتگو
[ins_time] => ما معمولاً در چند دقیقه پاسخ میدهیم
[ins_sound] => https://.../media/sounds/ding-sound-effect_2.mp3
[ins_message] => سلام % به کمک نیاز دارید؟
[clickgen] =>
)
i have two checked box in my form name with 'shch' and 'foch'