Retain Checked the checkbox inside While - php

Question

this code is inside while after I submit the form instead of retaining what I checked it checked all after submitting.
I just want to happen after submitting the only check box i check is checked.
What should i do ?
<input type="checkbox" title ="<?php echo $sym ?>"<?php if(isset($_POST['poscon'])) echo "checked='checked'"; ?> name="poscon[]" value ="<?php echo $pc?>"><?php echo $pc?>

Answer 1

refer to in_array
<?php
if(isset($_GET["poscon"])) {
$_SESSION["poscon"] = $_GET["poscon"];
$dr=$_SESSION['poscon'];
if(isset($_POST['submit'])) {
if(!empty($_GET['poscon']))
$_SESSION['poscon'] = $_POST['poscon'];
$part=$_GET["poscon"];
}
$poscon=mysqli_real_escape_string($link,$_GET['poscon']);
$p = mysqli_query($link,"select distinct PossibleCondition,Symptoms from healthguide where Subpart like '%$poscon%' and PossibleCondition REGEXP '^[N-Z].*$' Order by PossibleCondition ");
while($r=mysqli_fetch_array($p)) {
$pc=$r["PossibleCondition"];
$sym=$r["Symptoms"];
if(isset($_POST) && isset($_POST['poscon']) && in_array($pc,$_POST['poscon']))
$strIsChecked='checked="checked"';
else
$strIsChecked=null;
echo '<tr>';
echo '<td><input type="checkbox" '.$strIsChecked.' title ="'.$sym.'" name="poscon[]" value ="'.$pc.'"></td>';
echo '<td>'.$pc.'</td>';
echo '</tr>';
}
}
?>

Answer 2

$_POST['poscon'] is a array. Run my script and see how it works.
<?php
/**
* File test.php
*/
// Store checked Values in Array $arrChecked
$arrChecked=array();
if(isset($_POST) && $_POST['poscon']) {
// Debug: Show all POST Vars
echo "<pre>"; print_r($_POST); echo "</pre>";
foreach($_POST['poscon'] AS $checkboxValue) {
// fill array with checked values
// e.g. arrChecked['foo'] = true;
$arrChecked[$checkboxValue] = true;
}
}
/**
* Note for HTML-Block:
* shorthand php if/else used
* http://stackoverflow.com/questions/4567292/overview-of-php-shorthand
*/
?>
<form action="test.php" method="post">
<input type="checkbox" name="poscon[]" value="foo" <?php echo (isset($arrChecked) && $arrChecked['foo'] ? 'checked="checked"' : '');?>> foo
<input type="checkbox" name="poscon[]" value="bar" <?php echo (isset($arrChecked) && $arrChecked['bar'] ? 'checked="checked"' : '');?>> bar
<input type="submit" value="go">
</form>