How get value for unchecked checkbox in checkbox elements when form posted?

Question

I have a form like below :

Answer 1

First way - hidden fields (disadvantage: the user can manipulate the value of the field (but one can manipulate the value of the checkbox too, so it's not really a problem, if you only expect 1 or 0))

<form action="" method="post">
<input type="hidden" name="status_1" value="0" />
<input type="checkbox" id="status_1" name="status_1" value="1" />
<input type="hidden" name="status_2" value="0" />
<input type="checkbox" id="status_2" name="status_2" value="1" />
<input type="hidden" name="status_3" value="0" />
<input type="checkbox" id="status_3" name="status_3" value="1" />
<input type="submit" />
</form>
<?php
var_dump($_POST);
/*
 * checking only the second box outputs:
 * 
 * array (size=3)
  'status_1' => string '0' (length=1)
  'status_2' => string '1' (length=1)
  'status_3' => string '0' (length=1)
 */

Second way - to assign default value for non-set indexes:

<form action="" method="post">
<input type="checkbox" id="status_1" name="status_1" value="1" />
<input type="checkbox" id="status_2" name="status_2" value="1" />
<input type="checkbox" id="status_3" name="status_3" value="1" />
<input type="submit" />
</form>
<?php
for($i = 1; $i<=count($_POST); $i++) {
    $_POST["status_$i"] = isset($_POST["status_$i"]) ? $_POST["status_$i"] : 0;
}
var_dump($_POST);

/**
 * Here we will be checking only the third checkbox:
 * 
 * array (size=3)
  'status_3' => string '1' (length=1)
  'status_1' => int 0
  'status_2' => int 0
 */

Answer 2

try below code

    $myresult = array();

    if(!isset($_POST['status_1'])){ 
        $myresult['status_1'] = 0;
    }
    if(!isset($_POST['status_2'])){ 
        $myresult['status_2'] = 0;
    }
    if(!isset($_POST['status_3'])){ 
        $myresult['status_3'] = 0;
    }

    echo "<pre>";
    print_r($myresult);
    echo "</pre>";
    exit;

Answer 3

Thanks all. Thank to @RoyalBg give me solution. Like this :

<input type="hidden" name="status_1" value="0" />
<input type="checkbox" id="status_1" name="status_1" value="1" /> Check 1 <br />
<input type="hidden" name="status_2" value="0" /> 
<input type="checkbox" id="status_2" name="status_2" value="1" /> Check 2 <br />
<input type="hidden" name="status_3" value="0" />
<input type="checkbox" id="status_3" name="status_3" value="1" /> Check 3 <br />

It's work perfectly.. :)

Answer 4

<!--html code-->                                                                  
<input type="checkbox" name="correct" value="1">Option 1
<input type="checkbox" name="correct" value="2">Option 2
<input type="checkbox" name="correct" value="3">Option 3
<input type="checkbox" name="correct" value="4">Option 4                                   

//php code in function called on form submit       
  public function addOptions(Request $request)
   {
    $option = array('1' => 0,'2'=>0,'3'=>0,'4'=>0 );
    $option[$request->correct] = 1;
    return $option;
   }

Answer 5

Try this. If the checkbox is not checked, then the hidden field with the same name will be passed instead.

<form action="" method="post">
  <input type="hidden" id="hidden_status_1" name="status_1" value="0" />
  <input type="checkbox" id="status_1" name="status_1" value="1" />
  <input type="hidden" id="hidden_status_2" name="status_2" value="0" />
  <input type="checkbox" id="status_2" name="status_2" value="1" />
  <input type="hidden" id="hidden_status_3" name="status_3" value="0" />
  <input type="checkbox" id="status_3" name="status_3" value="1" />
</form>