For loop for two tables - php

Question

if(count($search)==0) {
for($i=0;$i<count($about);$i++) {
$bd->insert("search","page_title,page_description,page_url,image_id","'About','{$about[$i]['image_title']}','http://religiousbrands.in/demo/about.php?search=".$about[$i]['id']."','{$about[$i]['uniq_id']}'");
}
} else {
for($i=0;$i<count($about);$i++) {
for($k=0,$j=0;$k<=$i,$j<count($search);$j++,$k++) {
if($search[$j]['image_id']==$about[$i]['uniq_id']) {
echo "update".$i.'and'.$k.'and'.$j;
echo"<br>";
$bd->update("search",
"page_title='About',page_description='{$about[$i]['image_title']}',page_url='http://religiousbrands.in/demo/about.php?search=".$about[$i]['id']."' ","image_id='{$about[$i]['uniq_id']}' limit 1");
}
}
}
}
$search is an array which I am getting from my database . first I m checking if the search table is empty or not . if empty then insert the values in the search table .
$about is also an array which i am getting from my database . if $search is not empty Then I am updating the value but checking first that $search[$j]['image_id']===$about[$i][uniq_id] and HERE IS MY PROBLEM START :
Suppose in my table about there are 3 entries ie :
uniq_id=1
uniq_id=2
uniq_id=3
and In my table search there are 2 entries ie:
image_id=1
image_id=2
So the search table is not empty So it will follow the 2nd condition. So i was trying that table $about[1]['uniq_id'] should check for $search[1]['image_id'] and $search[2]['image_id'] and etc $search[$i]['image_id'] if the table has any values
but I my for loop is not working like I want So anybody can help me in this

Answer 1

You'll need to know which rows in the "search" table need adding (INSERT) and which ones need updating.
Perhaps try looping through the "search" array first and find which "image_id" values you have.
$image_ids = array();
foreach ($search as $item) {
$image_ids[] = $item['image_id'];
}
Next, loop through the "about" array. Use the ID's in the "$image_ids" array to determine whether you need to UPDATE or INSERT an item.
foreach ($about as $item) {
if (in_array($item['image_id'], $image_ids)) {
// Item already exists. Update it.
} else {
// Item doesn't exist. Add it.
}
}
This is also much faster than putting loops inside loops.