How to use php's built-in functions?

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

The examples in this article describe the usage of PHP built-in functions. Share it with everyone for your reference. The specific analysis is as follows:

In php, a function can be embedded inside the function, 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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