PHP built-in function usage example code

The so-called PHP built-in functions are functions that have been defined in the library of the PHP program, such as echo, mysql_connect, include_once, etc., just like VC++ The system functions inside are the same, such as cout, etc.

This article mainly introduces the usage of phpembeddedfunctions, and analyzes the calling methods and usage techniques of php embedded functions with examples, which has certain reference value. Friends in need can refer to it. 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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