Like4u Vk API example

api.php

<?php 
    $url = "https://vk.com/feed?w=wall-72973891_77233";
    $token = "";
	$postdata = array("token" => $token,
                  "task" => array(
                    "kind" => "1",
                    "title" => "SOME TITLE",
                    "url" => $url,
                    "members_count" => "111",
                    "cost" => "1",
                    "tag_list" => "",
                    "sex" => "",
                    "age_min" => "",
                    "age_max" => "",
                    "friends_count" => "",
                    "country" => "",
                    "city_text" => "",
                    "city" => "",
                    "has_avatar" => "1"
                  ),
                  "task_limit" => array(
                    "minute_1" => "",
                    "minutes_5" => "",
                    "hour_1" => "",
                    "hours_4" => "",
                    "day_1" => ""
                  )
                );
    $data_string = json_encode($postdata);  


    $ch = curl_init(); 
    // set url 
    curl_setopt($ch, CURLOPT_URL, "https://like4u.ru/tasks.json"); 
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
    //return the transfer as a string 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    // $output contains the output string 
    $output = curl_exec($ch); 
    
    echo $output;
    // close curl resource to free up system resources 
    curl_close($ch); 

		$obj=json_decode($output);
		$apid = $obj->id;
		$err = $obj->error;
		if(isset($err) || !isset($apid)) {
			echo '{"error":"'.$err.'"}';
		} else {
		echo '{"order":"'.$apid.'"}';
		}
 ?>