A brief introduction to the usage of php built-in functions

This article mainly introduces the usage of PHP embedded functions. It analyzes the calling methods and usage techniques of PHP embedded functions with examples. It has certain reference value. Friends in need can refer to the following

Examples of this article Learn how to use php built-in functions. The specific analysis is as follows:

You can embed a function inside the function in php, and the calling scope is limited to the function itself

<?php
function msg()
{
  echo("<center><h2>Displaying even
  numbers</h2></center><p><p>");
  function displayeven()
  {
   $ctr=0;
   echo("<font size=4>");
   for($i=2;$i<=100;$i+=2)
   {
     echo("$i    ");
     $ctr++;
     if($ctr%10==0)
     {
      echo("<p>");
     }
   }
   echo("</font>");
  }
}
msg();
displayeven();
?>

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