Multi array of checkbox with php

Question

Hi I want to use Multi array of checkbox with php , and i want to get all values in each array checked or not checked . my problem is the array is content only the checked value .

this is my code :-

  if($_POST['send']){
            $co = count($_POST['recomID']);
               for($i=0; $i<= $co -1 ;$i++) {
 $result = mysql_query("UPDATE `recom` SET
 `crit1` = '".$_POST['ch1'][$i] ."',
 `crit2` = '".$_POST['ch2'][$i]."',
 `crit3` = '".$_POST['ch3'][$i]."',
 `crit4` = '".$_POST['ch4'][$i]."', WHERE `id` = '".$_POST['recomID'][$i]."'");
               }
       }


 while($recomObject = mysql_fetch_object($recomResult)){

    echo '   
    <tr>
    <td>'.$recomObject->op.'</td>
    <td align="center"><input type="checkbox" value="1" name="ch1[]" /></td>
    <td align="center"><input type="checkbox" value="1" name="ch2[]" /></td>
    <td align="center"><input type="checkbox" value="1" name="ch3[]" /></td>
    <td align="center"><input type="checkbox" value="1" name="ch4[]" /></td>
    <td><input type="hidden" name="recomID[]" value="'.$recomObject->id.'"/>
    </td>
    </tr>';}

Need more info. Do you need to look at the values by row or column? Then what do you need to do — Ryan B
– Ryan B, Commented Mar 22, 2013 at 18:36

jnthnjns · Accepted Answer · 2013-03-22 19:52:12Z

2

I have ran into this situation before and I resolved by placing a hidden input before the checkbox with the same name. If the checkbox is checked then that value will override the hidden. This should work for you.

The second input always overrides the first. In this case checkboxes don't POST if unchecked which means the hidden input would POST a value of 0

PHP:

<?php 

if (isset($_POST['ch1'])) {
    echo '<pre>', print_r($_POST['ch1'], true), '</pre>';
    echo '<pre>', print_r($_POST['ch2'], true), '</pre>';
    echo '<pre>', print_r($_POST['ch3'], true), '</pre>';
    echo '<pre>', print_r($_POST['ch4'], true), '</pre>';
}

?>

HTML:

<form action="<?php $_SERVER['PHP_SELF'] ?>" method="post">
    <!-- Row 1 Checkboxes -->
    <input type="hidden" value="0" name="ch1[0]" />
    <input type="checkbox" value="1" name="ch1[0]" />
    <input type="hidden" value="0" name="ch2[0]" />
    <input type="checkbox" value="1" name="ch2[0]" />
    <input type="hidden" value="0" name="ch3[0]" />
    <input type="checkbox" value="1" name="ch3[0]" />
    <input type="hidden" value="0" name="ch4[0]" />
    <input type="checkbox" value="1" name="ch4[0]" />

    <br />

    <!-- Row 2 Checkboxes -->
    <input type="hidden" value="0" name="ch1[1]" />
    <input type="checkbox" value="1" name="ch1[1]" />
    <input type="hidden" value="0" name="ch2[1]" />
    <input type="checkbox" value="1" name="ch2[1]" />
    <input type="hidden" value="0" name="ch3[1]" />
    <input type="checkbox" value="1" name="ch3[1]" />
    <input type="hidden" value="0" name="ch4[1]" />
    <input type="checkbox" value="1" name="ch4[1]" />

    <!-- And so forth... -->

    <input type="submit">
</form>

[x] [ ] [x] [ ]
[ ] [x] [ ] [x]  [ SUBMIT ]

Output:

Array
(
    [0] => 1
    [1] => 0
)
Array
(
    [0] => 0
    [1] => 1
)
Array
(
    [0] => 1
    [1] => 0
)
Array
(
    [0] => 0
    [1] => 1
)

Edit

$i = 0;
while($recomObject = mysql_fetch_object($recomResult)){
    echo '   
        <tr>
        <td>'.$recomObject->op.'</td>
        <input type="hidden" value="0" name="ch1['.$i.']" />
        <input type="hidden" value="0" name="ch2['.$i.']" />
        <input type="hidden" value="0" name="ch3['.$i.']" />
        <input type="hidden" value="0" name="ch4['.$i.']" />
        <td align="center"><input type="checkbox" value="1" name="ch1['.$i.']" /></td>
        <td align="center"><input type="checkbox" value="1" name="ch2['.$i.']" /></td>
        <td align="center"><input type="checkbox" value="1" name="ch3['.$i.']" /></td>
        <td align="center"><input type="checkbox" value="1" name="ch4['.$i.']" /></td>
        <td><input type="hidden" name="recomID[]" value="'.$recomObject->id.'"/>
        </td>
        </tr>';
    $i++;
}

edited Mar 22, 2013 at 19:52

answered Mar 22, 2013 at 18:28

jnthnjns

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7 Comments

UnholyRanger Over a year ago

wouldn't you want the hidden fields second so you always just check the first item for a 1 or 0?

jnthnjns Over a year ago

@unholyRanger Having them second means they would override the checked value. You would always get array values of false or 0

Mustafa Over a year ago

I do this but when I checked all the result is 1,0,1,0 ...etc

UnholyRanger Over a year ago

@Asok you will get an array array([0] => "0") on unchecked and array([0] => "1", [1] => "0") on checked if you do hidden second. If no [] was in the names, they would override

jnthnjns Over a year ago

@UnholyRanger You are correct, I fixed it, I forgot that when dealing with arrays I had to declare the index. See my edited answer above.

|

michi · Accepted Answer · 2013-03-22 18:38:12Z

0

You need to have the same name for every checkbox, but a different value:

<td align="center"><input type="checkbox" value="0" name="ch[]" /></td>
<td align="center"><input type="checkbox" value="1" name="ch[]" /></td>
<td align="center"><input type="checkbox" value="2" name="ch[]" /></td>
<td align="center"><input type="checkbox" value="3" name="ch[]" /></td>

Now, to get an array where every checked box is 1 and every unchecked box is 0, after submit do...

if (isset($_POST['ch'])) { // assuming form method = post

    $max = 3 // set number of checkboxes -1

    for ($i = 0;$i <= $max;$i++)

    $ch[$i] = intval(in_array($i,$_POST['ch']));

} else $ch = array();

EDIT: to get 0 or 1 for every single checkbox, do...

<td align="center"><input type="checkbox" value="1" name="ch1" /></td>
<td align="center"><input type="checkbox" value="1" name="ch2" /></td>
<td align="center"><input type="checkbox" value="1" name="ch3" /></td>
<td align="center"><input type="checkbox" value="1" name="ch4" /></td>

Then after submit...

if (isset($_POST['ch1'])) $ch1=0; else ch1=1;
...

If you have large numbers of checkboxes, you would iterate trough $_POST with foreach

edited Mar 22, 2013 at 18:38

answered Mar 22, 2013 at 18:23

michi

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2 Comments

Crazenezz Over a year ago

@Mustafa: Why you need four arrays? Can you explain in detail what is your goal?

Mustafa Over a year ago

See the image that added to question .

UnholyRanger · Accepted Answer · 2013-03-22 19:01:09Z

This method will give you the checked/unchecked status along with 4 arrays

form:

html>
<form method="post">
    <input type="hidden" name="ch1[]" value="0">
    <input type="checkbox" name="ch1[]" value="1">
    <input type="hidden" name="ch2[]" value="0">
    <input type="checkbox" name="ch2[]" value="1">
    <input type="hidden" name="ch3[]" value="0">
    <input type="checkbox" name="ch3[]" value="1">
    <input type="hidden" name="ch4[]" value="0">
    <input type="checkbox" name="ch4[]" value="1">
    <input type="submit">
</form>

The following will give one of 2 arrays (for each chX) when submitted

unchecked:

array([0] => "0")

checked:

array([0] => "1", [1] => "0")

Therefore you will always have a value in the [0] index. Example PHP:

if(isset($_POST['ch1'][0])){ //do check anyway
  echo $_POST['ch1'][0];
}

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