i need a little help on foreach - php

Question

This is my cats in mysql
cats_id cats_position cats_parentid
1 1> 0
2 1>2> 1
3 3> 0
4 1>2>4> 2
and i am trying to create a navigation like:
index > cars > fiat > punto
from
cat=4&parent=2&position=1>2>4>
I end up getting:
Index carcarcarcar
and my php knowledge is not enough to finish this code. can you help me please.
<?php
$position = trim($_GET['position']);
$pieces = explode(">", $position);
$i=0;
foreach($pieces as $piece){
$result = mysql_query("SELECT * FROM cats
WHERE cats_id='".$pieces[$i]."'");
while($row = mysql_fetch_array($result))
{
$piecesid[$i] = $row['cats_id'];
$piecesname[$i] = $row['cats_name'];
$piecesposition[$i] = $row['cats_position'];
}
$i++;
}
?>
Index
<?php $i=0; foreach($pieces as $piece){
if($i=0)
$parent=0;
else
$parent=$placesid[$i-1];
echo '<a href="cats.php?cat='.$piecesid[$i].'&parent='.$parent.'&position='.$piecesposition[$i].'">'.$piecesname[$i];
}

Answer 1

Your first error is a missing semicolon here:
$i++;
The second bug is a missing dot after $parent in the echo line:
'&parent='.$parent.'&position='
The third (unexpected end) error will become apparent when you started to indent your code correctly. It's also bad style to omit the curly braces, because that makes it more difficult to find precisely such errors.
And lastly: when posting on Stackoverflow, include the full error message (which always mentions the line number!)

Answer 2

I believe this is what he is looking for:
Create a mysql table with id, parent_id, and name fields.
When a category is a "child" of another, that others parent_id field should be set accordingly, I see you already have something to that effect.
Use this code, setting $cat via $_GET['cat'] or something.
<?php
$cat = mysql_real_escape_string($_GET['cat']);
$res = mysql_query("select id,name,parent_id from categories where id = '$cat'");
$breadcrumb = array();
while ($category = mysql_fetch_object($res) {
$breadcrumb[] = "" . $category->name . "";
if ($category->parent_id != 0) {
$res = mysql_query("select id,name,parent_id from categories where id = '{$category->parent_id}'");
}
}
echo join(" > ", array_reverse($breadcrumb));
?>

Answer 3

You have not closed your foreach in the last php section
<?php $i=0; foreach($pieces as $piece){
if($i=0)
$parent=0;
else
$parent=$placesid[$i-1];
echo '<a href="cats.php?cat='.$piecesid[$i].'&parent='.$parent'&position='.$piecesposition[$i].'>'.$piecesname[$i];
//Missing } here
?>

Answer 4

you're missing a } at the end. Just put a } after the last line like this:
echo '<a href="cats.php?cat='.$piecesid[$i].'&parent='.$parent'&position='.$piecesposition[$i].'>'.$piecesname[$i];
}

Answer 5

By the way, you don't need cats_position in your table.
To handle hierarchical data like this you can use a nested set (http://en.wikipedia.org/wiki/Nested_set_model) or just rely on the parent_id.
The advantage of this is, that you for example don't need multiple parameters in your get query. Instead of
cat=4&parent=2&position=1>2>4>
you then archieve the same with:
cat=4