PHP/SQL - Combining AND & OR in a foreach() - php

Question

I'm sending json to the server like this:
{"data":{"tags":[{"tag":"Paris"},{"tag":"New York"},{"tag":"London"}]},"terms":{"term":"index"}}
... and with foreach() I'm appending the provided tags to the query:
$query = "SELECT name FROM accounts
WHERE name = '".$term."'";
foreach($tags as $t=>$tag){
$tag = $tag['tag'];
$query.=" AND city = '".$tag."'";
}
... to replicate this:
SELECT name FROM accounts
WHERE name=$term
AND city=$tag
AND city=$tag
AND city=$tag;
But how should the foreach() look like if I want to provide replicate this:
SELECT name FROM accounts
WHERE name=$term
AND (city=$tag OR city=$tag OR city=$tag);

Answer 1

It's better way to use IN clause in query and implode function to form it:
$tags_list = array();
foreach($tags as $t=>$tag){
$tags_list[] = $tag['tag'];
}
$query = "SELECT name FROM accounts
WHERE name = '".$term."'";
if ($tags_list) {
$query .= " AND city IN ('".implode("', '", $tags_list)."')";
}

Answer 2

The Problem with this is that in your sql query the column name couldn't have 2 tags at the same time. for example
WHERE name = true AND name = false
wouldn't make any sense.
so u should use something like this
WHERE name in ($tag, $term, $tag2);
and therefore u should adapt your php code as well
$first = true;
$query = "SELECT name FROM accounts
WHERE name2 = '$term' and name in ("
foreach($tags as $t=>$tag){
$tag = $tag['tag'];
if($first == false) {
$query.=",";
}
$query.="'".$tag."'";
$first = false;
}
$query.=")";