Email Information Gathering in Post Linkedin

GatheringEmailLinkedin.php

<?php
$targets = array_unique(explode("\n",file_get_contents("posts.targets")));
$user_agent = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0';

foreach ($targets as $key => $url_target) {
   
   #REQUEST PEGANDO ID
   exec("curl -kg --user-agent '{$user_agent}' '{$url_target}'>tmp");
   
   #GREP  ID
   $data_article_permalink =  'cat tmp | grep -oP \'(?<=data-article-permalink=").*?(?=">)\'';
   $data_article_urn =  'cat tmp | grep -oP \'(?<=data-article-urn="urn:li:article:).*?(?=")\'';
   $return[] = exec("{$data_article_urn}");
   $return[] = exec("{$data_article_permalink}");

   #SLEEP
   $sleep = random_int(1,5);
   sleep($sleep);

   #URL REQUEST
   $url_request_dump_email = "https://www.linkedin.com/content-guest/article/comments/urn%3Ali%3Aarticle%3A{$return[0]}?count=100&start=0&articlePermalink={$return[1]}";
   $file_dump_html = "dump_html_tmp_{$return[0]}";
   $file_dump_email = "emails_{$return[0]}";
   
   #REQUEST URL COMENTÁRIOS
   exec("curl -kg --user-agent '{$user_agent}' '{$url_request_dump_email}'>'{$file_dump_html}'");
   
   #GREP EMAILS
   exec('cat  "'.$file_dump_html.'" | grep -E -o \'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}\b\' | sort | uniq >'.$file_dump_email);
   echo " DUMP HTML: {$file_dump_html} \n EMAIL: {$file_dump_email}\n URL: {$url_request_dump_email}\n\n";
   $log = "\n-------------------------------------------\n";
   $log.= "\nDATA:".date('d-m-Y H:i:s');
   $log.= "\nURL:".$url_request_dump_email;
   $log.= "\n-------------------------------------------\n";
   file_put_contents("{$file_dump_email}",$log,FILE_APPEND);

   #SLEEP
   sleep($sleep);
   unset($return);
}