Webhook program to receive data from some remote client and process it and send to Airtable and add a record in table

WebhookToAirtable.php

<?php
class Processor {
        public function execute($targetFile) {
                $data = sprintf(
                        "%s %s %s \n\nHTTP headers:\n",
                        $_SERVER['REQUEST_METHOD'],
                        $_SERVER['REQUEST_URI'],
                        $_SERVER['SERVER_PROTOCOL']
                );
                foreach ($this->getHeaderList() as $name => $value) {
                        $data .= $name . ': ' . $value . "\n";
                }
                $data .= "\nRequest body:\n";
                                file_put_contents(
                        $targetFile,
                        $data . urldecode(file_get_contents('php://input')) . "\n"
                );

                ob_start();

                $request_headers = array();
                $request_headers[]= 'Accept: application/json';
                $request_headers[]= 'Authorization: Bearer mykey';
                $request_headers[]= 'Content-Type: application/json';


                $post_data=[];

                #Process the Array
                foreach ( $_POST as $key => $val )
                {

                        if ($key == 'Caller_Number')
                        {
                                 $val=str_replace('"', '', $val);
                                 print "\nFound Caller Number" . $val;
                                 $post_data['fields']=array('Mobile Number' => $val);
                        }
                }

                print "\n\nPOST DATA PROCESSING\n----------------------------------\n";
                echo str_replace("Array","",$post_data);


                $curl_connection = curl_init('https://api.airtable.com/v0/appOwnQngw2elSeVN/sometablef');


                if (!$curl_connection) {
                echo "\nError in opening CURL Connection\n";
                }

                //set headers
                curl_setopt($curl_connection, CURLOPT_HTTPHEADER, $request_headers);
                //set options
                curl_setopt($curl_connection, CURLOPT_CONNECTTIMEOUT, 30);
                #curl_setopt($curl_connection, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
                curl_setopt($curl_connection, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($curl_connection, CURLOPT_SSL_VERIFYPEER, false);
                curl_setopt($curl_connection, CURLOPT_FOLLOWLOCATION, 1);
                curl_setopt($curl_connection, CURLOPT_VERBOSE, 1);
                curl_setopt($curl_connection, CURLINFO_HEADER_OUT, true);

                //Remove the word Array from the json encode output
                $tosend = str_replace("Array","",json_encode($post_data));

                //Remove the Quotes around the number when sending the output
                $pattern = '/\"([0-9]+)\"/i';
                $replacement = '${1}';
                $tosend = preg_replace($pattern, $replacement, $tosend);
                print "\n\nNUMBER BEING SENT".$tosend;

                //Add the data into POSTFIELDS
                curl_setopt($curl_connection, CURLOPT_POSTFIELDS, $tosend);

                //perform our request
                $result = curl_exec($curl_connection);

                //show information regarding the request
                print "\n\n\nCURL REQUEST LOG \n----------------------------------\n";
                print_r(curl_getinfo($curl_connection));
                echo curl_errno($curl_connection) . '-' .
                curl_error($curl_connection);
                print "RESULT\n".$result;
                //close the connection
                curl_close($curl_connection);


                $content = ob_get_clean();
                file_put_contents($targetFile, $content, FILE_APPEND);
                echo("God bless you");

        }
        private function getHeaderList() {
                $headerList = [];
                foreach ($_SERVER as $name => $value) {
                        if (preg_match('/^HTTP_/',$name)) {
                                // convert HTTP_HEADER_NAME to Header-Name
                                $name = strtr(substr($name,5),'_',' ');
                                $name = ucwords(strtolower($name));
                                $name = strtr($name,' ','-');
                                // add to list
                                $headerList[$name] = $value;
                        }
                }
                return $headerList;
        }
}
(new Processor)->execute('./toairtable.txt');