Dynamically Creating mysql select Query - php

Question

I have multiple checkboxes in my websites:
checkbox 1
checkbox 2
checkbox 3 etc.
I want to dynamically generate mysql query based on the above checkboxes.
i:e if 1st checkbox is selected then the query should be:
$mysql="Select * from mytable where colname=" . $checkbox1 .;
if 1st and 2nd checkbox is selected then the query should be:
$mysql="Select * from mytable where colname=" . $checkbox1 ."AND colname=" . $checkbox2 ." ;
if all are selected then it should be :
$mysql="Select * from mytable where colname=" . $checkbox1 . "AND colname=" . $checkbox2 ."AND colname=" . $checkbox3 . ;
Can someone pls help:

Answer 1

you have to change your form like follow because its taking multiple value its should be post as an array
<form action="register.php" method="POST">
<input type="checkbox" name="rating[]" value="5">5 Star
<input type="checkbox" name="rating[]" value="4">4 Star
<input type="checkbox" name="rating[]" value="3">3 Star
<input type="checkbox" name="rating[]" value="2">2 Star
<input type="checkbox" name="rating[]" value="1">Less than 2 Star
</form>
Then in php
$where = '';
if(isset($_POST['rating'])){
$data = implode(',',$_POST['rating']); // beacuse your rating is only one column in db i think
$where = "WHERE cloumn_name IN($data)";
}
$query = "SELECT * FROM your_table $where";

Answer 2

You can use string concatenation with a bit of trickery to get the job done. do not rely on isset, instead use !empty.
<form action="example.php" method="post">
<input type="checkbox" name="Col1" value="colname" />Col 1</br>
<input type="checkbox" name="Col2" value="colname" />Col 2</br>
<input type="checkbox" name="Col3" value="colname" />Col 3</br>
</form>
<?php
if(!empty($_POST)) {
$string = '';
if(!empty($_POST['col1'])) {
$string.= "column1 ='".$_POST['col1']."'";
}
if(!empty($_POST['col2'])){
if(!empty($string)) {
$string.=" AND ";
}
$string.= "column2 ='".$_POST['col2']."'";
}
if(!empty($_POST['col3'])){
if(!empty($string)) {
$string.=" AND ";
}
$string .= "column3 ='".$_POST['col3']."'";
}
if(!empty($string))
{
//execute your query here.
}
}

Answer 3

Something about it
<? if ($_POST[option]==1) {
//query
}
?>
<form method="post">
<input type="checkbox" name="option" value="1">1
<input type="checkbox" name="option" value="2">2
<input type="checkbox" name="option" value="3">3
</form>

Answer 4

Just check if your Checkboxes are selcted via (isset($_POST[checkbox1]))
So you could do something like
if (isset($_POST[checkbox1])
{
//statement
}
else if (isset($_POST[checkbox2])
{
//statement2...
}
...
Read more here
Cheers

Answer 5

It should be apparent from the code provided below that I'm certainly no PHP coder. But anyway, here's an idea to think about...
Try it with different values for input between 0 and 127, e.g. ?input=66
<?php
if(isset($_GET['input'])){
$input = $_GET['input'];
}else{
$input=0;
}
$days = array('mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun');
for( $i=0; $i<7; $i++ ) {
$daybit = pow(2,$i);
if( $input & $daybit ) {
echo "<input type = checkbox checked/>$days[$i]";
}else{
echo "<input type = checkbox>$days[$i]";
}
}
?>