SELECT Queries and creating an infinate loop in PHP - php

Question

I am trying to create multiple loops in PHP to select parent and child items. i have this code:
<?php
$counter = 0;
$sql="SELECT * from shop_categories where parent = '' order by name ASC ";
$rs=mysql_query($sql,$conn);
while($result = mysql_fetch_array($rs)) {
$flag = 1;
$current_parent_sequence = $result["sequence"];
echo '<strong>'.$result["name"].'</strong><br>';
while($flag == 1) {
$counter++;
$sql2="SELECT * from shop_categories where parent = '".$current_parent_sequence."' order by name ASC ";
$rs2=mysql_query($sql2,$conn);
if(mysql_num_rows($rs2) > 0) {
while($result2=mysql_fetch_array($rs2)) {
$current_parent_sequence = $result2["sequence"];
echo $counter.' - '.$result2["name"].'<br>';
}
} else {
$flag = 0;
}
}
}
?>
then i have this data in my table - http://postimg.org/image/o2p31xd1j/
so it should show the parent items and its child items and their child items and so on but its only showing:
Cat 1
1 - Sub Cat 1
1 - Sub Cat 2
Cat 2
Cat 3
4 - Sub Cat 1

Answer 1

Please try below code. It might help you. You need create function which will call recursively.
function getChild($conn, $id) {
$rs=mysqli_query($conn, "SELECT * from test_tbl where parent = '$id' order by name ASC ");
while($result = mysqli_fetch_assoc($rs)) {
$current_parent_sequence = $result["sequence"];
$parent = $result["parent"];
echo "--" . $result["name"] . "<br>";
if($parent != 0)
getChild($conn, $current_parent_sequence);
}
}
$rs=mysqli_query($conn, "SELECT * from test_tbl where parent = '' order by name ASC ");
while($result = mysqli_fetch_assoc($rs)) {
$current_parent_sequence = $result["sequence"];
$parent = $result["parent"];
echo $result["name"] . "<br>";
getChild($conn, $current_parent_sequence);
}
Use mysqli as mysql is deprecated.