title: PHP run multiple scripts simultaneously in background
body: <p>I want to run more than 300 PHP script simultaneously in background. I tried  using exec() one after another. But it runs sequentially. It means first it executes exec() first command then next exec() command. How can I run all PHP script in background at a time ? Current code : </p>
  
  <pre><code>exec("wget -O - http://mywebsite.com/index.php &gt;/dev/null 2&gt;&amp;1");
  exec("wget -O - http://mywebsite.com/index3.php &gt;/dev/null 2&gt;&amp;1");
  exec("wget -O - http://mywebsite.com/index4.php &gt;/dev/null 2&gt;&amp;1");
  exec("wget -O - http://mywebsite.com/index5.php &gt;/dev/null 2&gt;&amp;1"); 
  </code></pre>
  
  <p>This script first executes index.php entirely and then executes index3,4,5. But I want to run all at a time. Any help would be appreciated. </p>
  
  <p>Thank you!</p>
  
  <p>Regards,
  John</p>