php - json_decode is returning a null value instead of an array -

i trying search keyword email in decoded data. not able array type json_decode.

here code

$curl = curl_init();  curl_setopt_array($curl, array(     curlopt_returntransfer => true,     curlopt_url => $url,     curlopt_useragent => 'mozilla/5.0 (macintosh; intel mac os x 10_9_2) applewebkit/537.36 (khtml, gecko) chrome/43.0.2357.81 safari/537.36' ));  $resp = json_decode(curl_exec($curl), true);   if(is_array($resp) && array_key_exists("email", $resp)) {   echo $data_arr[0] . "email: ";   $content = $resp["email"];   fwrite($fp,$content); } 

the exact error is:

array_key_exists() expects parameter 2 array, null given in index.php on line 34

edit: figured out error somewhat. curl execution fails due error ( url malformed). still not able figure out how url malformed in case. url extracted such.

$data = fgets($fp); $data_arr = split(",", $data); $token_arr = isset($data_arr[1]) ? split('"', $data_arr[1]) : null;  $url = isset($token_arr[1]) ? "https://graph.facebook.com/v2.3/me?access_token=" . $token_arr[1] : null; 

try use utf8_encode

$data = curl_exec($curl); $data = utf8_encode($data); $resp = json_decode($data, true); 

note: utf8_decode work utf8

this function works utf-8 encoded strings.

php implements superset of json specified in original » rfc 4627 - encode , decode scalar types , null. rfc 4627 supports these values when nested inside array or object. although superset consistent expanded definition of "json text" in newer » rfc 7159 (which aims supersede rfc 4627) , » ecma-404, may cause interoperability issues older json parsers adhere strictly rfc 4627 when encoding single scalar value.

_{source: http://php.net/manual/en/function.json-decode.php}

encode arguments in url needed, try urlencode or rawurlecnode, example:

note, added () in ? :

$data = fgets($fp); $data_arr = split(",", $data); $token_arr = isset($data_arr[1]) ? split('"', $data_arr[1]) : null;  $url = isset($token_arr[1]) ? ("https://graph.facebook.com/v2.3/me?access_token=" . urlencode($token_arr[1])) : null; 

check if send null

if curl_error return malformed meaning $url = null, problem in code generates token, try this:

$data = fgets($fp); $data_arr = split(",", $data); $token_arr = isset($data_arr[1]) ? split('"', $data_arr[1]) : null;  $url = isset($token_arr[1]) ? ("https://graph.facebook.com/v2.3/me?access_token=" . $token_arr[1]) : null;  if (empty($url)) {    echo 'url null or empty';    exit; }  $curl = curl_init();  curl_setopt_array($curl, array(     curlopt_returntransfer => true,     curlopt_url => $url,     curlopt_useragent => 'mozilla/5.0 (macintosh; intel mac os x 10_9_2) applewebkit/537.36 (khtml, gecko) chrome/43.0.2357.81 safari/537.36' ));  $data = curl_exec($curl); $data = utf8_encode($data); $resp = json_decode($data, true);  if(is_array($resp) && array_key_exists("email", $resp)) {   echo $data_arr[0] . "email: ";   $content = $resp["email"];   fwrite($fp,$content); }