Processing CSV through php function - php

Question

I made a PHP function that works with an API to show me the dollar balance of an account. This function is called: get_balance
function get_balance($account){
$url = 'http://mycompaniesurl.com/' . $account; // url of website
global $response;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 3);
$response = curl_exec($ch);
curl_close($ch);
}
The function get_balance returns the output in the variable $response
I'm certain that the function works, so I have no questions on that part. However, I'm trying to process accountnumbers written down in a CSV file. I call the CSV file with the following code:
$file = new SplFileObject("test.csv");
$file->setFlags(SplFileObject::READ_CSV);
$data = call_user_func_array('array_merge', iterator_to_array($file));
$data = array_combine(range(1, count($data)), $data);
extract($data, EXTR_PREFIX_ALL, 'variable');
I'm testing my code with a csv file called test.csv, containing 4 addresses (first one has a balance of 0, other 3 have a balance of >0).
With the following code I get the balance with the accountnumber printed to my screen:
get_balance($data[2]);
if ($response > 0){
echo $response,"---------------",$data[2];
}
Because $data[1] has a balance of 0, nothing is printed. $data[2],$data[3] and $data[4] have a balance of more than 0, so they do return the balance together with the accountnumber.
Now what my question is; is there a way to 'automatically' do this? Something like
get_balance($data[]);
seems to not work. The CSV that this php file has to process is about ~1000 accountnumber and may have more in the future, so typing a get_balance($data[1]) up to get_balance($data[999]) will be a time consuming business.
Is there a (simple) way to apply the function to ALL the $data[] ?

Answer 1

Yes, there is, called array_map:
$balanced_data = array_map("get_balance", $data);
This will leave $balanced_data empty, because at the moment get_balance has no return, but uses a global variable. Change it to something like this
function get_balance($account){
$url = 'http://mycompaniesurl.com/' . $account; // url of website
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 3);
$response = curl_exec($ch);
curl_close($ch);
return $response;
}
If you don't want to or can't change get_balance, you will need a workaround like this
$max = count($data);
for ($i=0; $i<$max; $i++) {
$response = 0; // reset to make sure we get a new value
get_balance($data[$i]);
$balanced_data[$i] = $response;
}