Working with forms in PHP-checkbox

Original reproduced from: http://www.html-form-guide.com/php-form/php-form-checkbox.html

Single checkbox

shaped like:

<formAction= "checkbox-form.php"Method= "POST">Do you need wheelchair access? <inputtype= "checkbox"name= "Formwheelchair"value= "Yes" />    <inputtype= "Submit"name= "Formsubmit"value= "Submit" /></form>

If '$_POST[‘formWheelchair‘]`的值是"Yes"，那么该checkbox被勾选

If the checkbox is not checked, then ' $_POST[‘formWheelchair‘]` will not be set

Here's how PHP handles the form:

<?  If(isset($_post[' Formwheelchair ')] &&    $_post[' Formwheelchair '] = = ' Yes ')    {echo "need wheelchair access." ;} Else {    echo "Do not need wheelchair access." ;}     ? >

The Isset method can be used to determine if ' formwheelchair ' is checked, and if not, returns false

CheckBox combination

The recurring scenario is multiple checkboxes, as shown in the following example:

<formAction= "checkbox-form.php"Method= "POST">which buildings do you want access to?<BR/><inputtype= "checkbox"name= "formdoor[]"value= "A" />Acorn Building<BR/><inputtype= "checkbox"name= "formdoor[]"value= "B" />Brown Hall<BR/><inputtype= "checkbox"name= "formdoor[]"value= "C" />Carnegie Complex<BR/><inputtype= "checkbox"name= "formdoor[]"value= "D" />Drake Commons<BR/><inputtype= "checkbox"name= "formdoor[]"value= "E" />Elliot House<inputtype= "Submit"name= "Formsubmit"value= "Submit" /> </form>

Note that the checkbox has exactly the same name, (formdoor[], and also note that each name ends with [], using [] to make an array of the values of each checked check box in PHP, $_post[' Formdoor ') Returns an array of values that have the check box checked

For example, I tick all the checkboxes and $_POST[‘formDoor‘] will return an array of {a,b,c,d,e}, the following example of how to remove the array values and display them:

<?PHP$aDoor=$_post[' Formdoor ']; if(Empty($aDoor))   {    Echo("You didn ' t select any buildings.")); }   Else  {    $N=Count($aDoor); Echo("You selected$NDoor (s): ");  for($i= 0;$i<$N;$i++)    {      Echo($aDoor[$i] . " "); }  }?>

Visible ' empty () ' can be used to empty the array, ' count ' for the array count

Check whether a particular option is checked

functionIsChecked ($chkname,$value)    {        if(!Empty($_post[$chkname]))        {            foreach($_post[$chkname] as $chkval)            {                if($chkval==$value)                {                    return true; }            }        }        return false; }

Questions and Answers from StackOverflow

If your HTML page looks like this:

<type= "checkbox"  name= "Test"  value= " Value1 ">

After submitting the form you can check it with:

isset ($_post[' Test '])

Or

if ($_post[' test '] = = ' value1 ') ...

Working with forms in PHP-checkbox