PHP - How to 'parse data' from database using one method - php

Question

I have tried a few different ways to make this work to no avail.
Basically, I have these 4 lines that are in many functions:
function getID($URL){
//These 3 plus this comment line
$parentQ = "select * from cdi_content where URL=\"$URL\"";
$parentResult = mysql_query($parentQ); // Run the Query
$link = mysql_fetch_assoc($parentResult); // Query Result
...continues...
That basically tells the database to check $URL and if it matches the URL string in the database, it grabs all of the data associated with that URL, and I grab what I need with
$link['ID'];
Which would give me the ID associated with the $URL URL.
The function checks a list of conditionals that either print the 'override' variable ($ID), the default variable ($defaultID) or pulls from the server ($link['ID']), like below. The 'override' is a variable outside of the function that is currently called in by global $ID.
$ID = ''; //Overrides if set
function parseData($URL){
//Initialize Query for Table Data
$parentQ = "select * from cdi_content where URL=\"$URL\"";
$parentResult = mysql_query($parentQ); // Run the Query
return mysql_fetch_assoc($parentResult); // Query Result
};
function getID($URL){
global $ID;
$serverID = parseData($URL);
if(empty($ID)){
if(empty($serverID)){
echo $defaultID;
} else { echo $serverID['ID']; }
}//end of ifs
else
{ echo $ID; }
};

Answer 1

So you you want to parse the data row you would need search criteria $criterion and a field you you want it to return:
function getField($criterion, $returnField){
$parentQ = "select * from cdi_content where URL='".$criterion."' LIMIT 1"; // also make sure you that $criterion is safe to use in a query
$parentResult = mysql_query($parentQ); // Run the Query
if ($parentResult)
{
$row = mysql_fetch_assoc($parentResult);
return $row[$returnField];
}
else
{
return FALSE;
}
}
Now you can call it:
$linkId = getField($url, 'ID');

Answer 2

If I'm understanding you correctly, you're just trying to refactor that function so you don't have to keep on re-writing it. Is that correct?
If so, you can extract a new function like this:
function getLink($URL){
$parentQ = "select * from cdi_content where URL=\"$URL\"";
$parentResult = mysql_query($parentQ); // Run the Query
return mysql_fetch_assoc($parentResult);
}
And then call it like this:
function getID($URL){
$link = getLink($URL);
}