PHP的最简单用法

PHP的最简单用法

<? php
  include ("library.php" );
  include_once ("library.php" );
  require_once ("library.php" );

  echo  "Hello world" ;
  $username  = "Fred Smith" ;
  echo   $username  ;
  echo   str_repeat ("Hip ", 2);    //   Repeat string 
 echo   strtoupper ("hooray!");    //   String to upper case 
 $n3  =  ucfirst ( strtolower ( $n3 ));     //   首字母改成大写 
 echo   substr ( $number , 4, 1 );
      $n1  =  ucfirst ( strtolower ( $n1  ));

  echo  "<br />" ;
  echo  "a: [" . (20 > 9) . "]<br />" ;
  $myarray    =  array ("One", "Two", "Three" );
  $number  = 12345 * 67890 ;
 ?>


<? php
  $author  = "Alfred E Newman" ;

  echo  <<<_END   //   一直到底 
 This is a Headline

This is the first line . 
This is the second .
- Written by  $author . 
_END;
 ?>

<? php
  function  longdate( $timestamp  )
{
      return   date ("l F jS Y",  $timestamp  );
      $temp  =  date ("l F jS Y",  $timestamp  );
      return  "The date is  $temp " ;    
    
}
  echo  longdate( time  ());
  function  longdate( $timestamp  )
{
      $temp  = "The date is " ;
      return   $temp . date ("l F jS Y",  $timestamp  );
}
 ?>

<? php
  $temp  = "The date is " ;
  echo  longdate( $temp ,  time  ());

  function  longdate( $text ,  $timestamp  )
{
      return   $text  .  date ("l F jS Y",  $timestamp  );
}
 ?>

<? php
  if      ( $page  == "Home")   echo  "You selected Home" ;
  elseif  ( $page  == "About")  echo  "You selected About" ;
  elseif  ( $page  == "News")   echo  "You selected News" ;
  elseif  ( $page  == "Login")  echo  "You selected Login" ;
  elseif  ( $page  == "Links")  echo  "You selected Links" ;
  switch  ( $page  )
{
      case  "Home":   echo  "You selected Home" ;
          break  ;
      case  "About":  echo  "You selected About" ;
          break  ;
      case  "News":   echo  "You selected News" ;
          break  ;
      case  "Login":  echo  "You selected Login" ;
          break  ;
      case  "Links":  echo  "You selected Links" ;
          break  ;
}
 ?>

摘自《[PHP.MySQL.JavaScript学习手册].源代码.zip》，第三第四章。没学到什么东西。

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