Could not get any response while using curl in PHP - php

Question

I am fetching the data using the curl in php but as many data are present it returning the 0 output. I am providing my code below.
$result = array();
// multi handle
$mh = curl_multi_init();
$idArr=[2,147,92];
foreach ($idArr as $key => $value) {
$fetchURL = "http://example.com/index.php/rest/V1/categories/".$value."/products/";
//echo $fetchURL.'<br>';
$multiCurl[$key] = curl_init();
curl_setopt($multiCurl[$key], CURLOPT_URL,$fetch_url);
curl_setopt($multiCurl[$key], CURLOPT_CUSTOMREQUEST, "GET");
curl_setopt($multiCurl[$key], CURLOPT_HEADER,array("Content-Type: application/json", "Authorization: Bearer " . json_decode($token)));
curl_setopt($multiCurl[$key], CURLOPT_RETURNTRANSFER,true);
curl_multi_add_handle($mh, $multiCurl[$key]);
}
$index=null;
do {
curl_multi_exec($mh,$index);
} while($index > 0);
// get content and remove handles
foreach($multiCurl as $k => $ch) {
$result[$k] = curl_multi_getcontent($ch);
curl_multi_remove_handle($mh, $ch);
}
// close
curl_multi_close($mh);
print_r($result);
Here I have to pass the multiple request and get the result but in this case no result is coming. While I am using simple curl the result is coming. Here my requirement is to reduce the response time.

Answer 1

You are missing the implementation of "curl_multi_select". I have done it for you but not tested. Give it a go
$result = array();
// multi handle
$mh = curl_multi_init();
$multiCurl = array();
$idArr=[2,147,92];
foreach ($idArr as $key => $value) {
$fetchURL = "http://example.com/index.php/rest/V1/categories/".$value."/products/";
//echo $fetchURL.'<br>';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$fetch_url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
curl_setopt($ch, CURLOPT_HEADER,array("Content-Type: application/json", "Authorization: Bearer " . json_decode($token)));
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
$multiCurl[$key] = $ch;
curl_multi_add_handle($mh, $ch);
}
$active =null;
do {
$mrc = curl_multi_exec($mh,$active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active && $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
foreach($multiCurl as $k => $ch) {
$result[$k] = curl_multi_getcontent($ch);
curl_multi_remove_handle($mh, $ch);
}
// close
curl_multi_close($mh);
print_r($result);

Answer 2

I think you can't get response due to set wrong variable in curl option set.Your third line in foreach loop should be like that
curl_setopt($multiCurl[$key], CURLOPT_URL,$fetchURL);
also you write wrong syntex for headers option replace CURLOPT_HEADER by CURLOPT_HTTPHEADER
here is sample code that works perfectly
$idArr=[20,18,21];
$mh = curl_multi_init();
$requests = array();
$curl_objs_arr = [];
foreach ($idArr as $key => $cat) {
$fetchURL = "http:example.com/v2/products?category=".$cat;
$requests[$key] = curl_init($fetchURL);
curl_setopt($requests[$key], CURLOPT_URL,$fetchURL);
curl_setopt($requests[$key], CURLOPT_CUSTOMREQUEST, "GET");
curl_setopt($requests[$key], CURLOPT_HTTPHEADER,array("Content-Type: application/json","Authorization: Bearer " . json_decode($token)));
curl_setopt($requests[$key], CURLOPT_RETURNTRANSFER,true);
curl_multi_add_handle($mh, $requests[$key]);
}
$running = null;
do {
curl_multi_exec($mh, $running);
} while($running > 0);
foreach ($requests as $key => $request) {
$result[$key] = curl_multi_getcontent($request);
curl_multi_remove_handle($mh, $request);
}
curl_multi_close($mh);
echo "<pre>";
print_r($result);exit;
set your code by this way, that's solve your problem.