Finding a faster function then "gethostbyname"? - php

Question

I run a script under xampp with a mysqlDB.
I check if a domainname has an ip.
The problem is, that I have to check over 100000 domain names from a MySQL_DB.
The function "gethostbyname" works great, but my solution is too slow.
while($row = mysqli_fetch_array($db_res)) { // get the DB domainnames entrys
if (empty($row['status'])) {
$items[] = $row['domainnames'];
}
foreach ($items AS $domain) {
if ( gethostbyname($domain) != $domain ) {
do somthing.....
}
}
}
How do I get it faster?

Answer 1

Your foreach() loop inside of your while() loop is simply a bad idea. Think about it.
As you iterate the result set, $items swells and swells -- this means that the foreach() will have to work longer and longer and longer.
Ultimately, if you need to process the gethostbyname() value for the next task in your script, you should be storing that value at the same time that you INSERT the entry into your table the first time -- perhaps the new column can be host.
The smart money is not to call gethostbyname() 100000 times; have the value ready when you SELECT it.
Beyond the above logic, I don't see the need to declare an array with a single element/string, then iterate it.
In fact, your query should contain a WHERE clause that excludes rows that have a null/0/blank status value AND includes rows that have a host (new column) value that matches $domain so that php doesn't have to bother any qualifying/disqualifying conditions.
foreach ($db_res as $row) { // yes, you can simply iterate the result object
// do whatever with the associative string elements (e.g. $row['domainnames'])
// ...you know this is a string and not an array, right? -^^^^^^^^^^^^^^^^^^^
}

Answer 2

thanks for the answers.
With your assistance i was able to reduce the procedure to:
while($row = mysqli_fetch_array($db_res))
{
$domain = $row['domainnames'];
if ( gethostbyname($domain) != $domain ) {
do somthing.....;
}
else{
do somthing.....;
}
}
it feels a little bit faster but not enough.
#mickmackusa i catch now only the empty "status" fields:
$db_res = mysqli_query ($db_link, "select domainnames FROM domaintable WHERE status = ''")

Answer 3

Looks like when your while loop iterates, it uses the $items from the last iteration - which will waste time - so please try this version (putting the foreach into the if:
while($row = mysqli_fetch_array($db_res)) { // get the DB domainnames entrys
if (empty($row['status'])) {
$items[] = $row['domainnames'];
foreach ($items AS $domain) {
if ( gethostbyname($domain) != $domain ) {
do somthing.....
}
}
}
}