代码改变世界

我的PHP练习

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Hello.php

?
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>我的第一个PHP程序</title>
<style type="text/css">
div { border:solid 1px red; margin: 10px 0px 10px 0px; padding: 5px;  }
div.innerDiv { border-color:green; }
</style>
</head>
<body>
<?php
 
/*
php 变量名区分大小写，而 类名、方法名不区分大小写
*/
 
 
function customError($error_level,$error_message /* 可选参数如下：error_file, error_line, error_context */)
{
    echo "<b>发生错误:</b> [$error_level] $error_message<br />";
    echo "即将停止脚步执行...";
    die();
}
set_error_handler("customError"  , E_USER_WARNING);
/*
•E_USER_ERROR - 致命的用户生成的 run-time 错误。错误无法恢复。脚本执行被中断。
•E_USER_WARNING - 非致命的用户生成的 run-time 警告。脚本执行不被中断。
•E_USER_NOTICE - 默认。用户生成的 run-time 通知。脚本发现了可能的错误，也有可能在脚本运行正常时发生。
*/
$testNum=0;
if ($testNum>1)
{
trigger_error("参数必须小于1。");
}
echo "<br/>";
 
function checkNum($num)
{
    if($num > 1)
    {
        throw new Exception("值必须小于1");
    }
    return true;
}
try
{
    checkNum(0);
    echo "您传入的数字参数正确！";
}
catch(Exception $e)
{
    echo "调用checkNum()方法时，异常被捕获，异常信息：".$e->GETMessage();
}
class MyCustomException extends Exception
{
    public function errorMessage()
    {
        $errorMsg = "<span style=\"color:red;\">“错误行号：".$this->getLine()."，在".$this->getFile()."：<b>".$this->getMessage()."</b>”</span>";
        return $errorMsg;
    }
}
echo "<br/>";
function checkPrice($tempPrice)
{
    if($tempPrice > 100)
    {
        throw new MyCustomException("价格不能大于100");
    }
    return true;
}
try
{
    checkPrice(200);
    echo "您传入的价格参数正确！";
}
catch(MyCustomException $e)
{
    echo "调用checkPrice()方法时，异常被捕获，异常信息：".$e->errorMessage();
}
echo "<br/>";
function CurrentPageException($ex)
{
    echo "<span style=\"color:red;background-color:gray;\">当前页发生错误！信息：".$ex->getMessage()."</span>";
}
set_exception_handler("CurrentPageException");
//throw new Exception("抛出Exception异常！");
echo "<br/>";
//throw new MyCustomException("抛出MyCustomException异常！");
 
//This is a comment
 
/*
要让PHP显示错误，修改配置文件 php.ini 中，把
display_errors = Off
改为 On
*/
 
echo "Hello World，我是周杰伦";
?>
 
<br/>
 
<div>
<?php
$myWord = "哈哈，世界和平！<br/>"; 
print "长度为：".strlen($myWord)."（提示：由于本文件的编码方式是UTF8，在PHP中，一个中文的长度为3，英文的长度为1，如果本文件的编码方式是GB2312，那么一个汉字的长度为2字节）<br/>";
echo $myWord."中国万岁".$myWord;
//echo($myWord);
//print($myWord);
echo "字符串\"布鲁斯Bruce.刘Liu最棒\"中Liu的位置为：".strpos("布鲁斯Bruce.刘Liu最棒","Liu")."<br/>";
if(4>5)
{
    echo "if执行<br/>";
}
elseif(4==5)
{
    echo "elseif执行<br/>";
}
else
{
    echo "else执行<br/>";
}
 
$x="hello";
switch ($x)
{
case "bruce":
  echo "Number 1";
  break;
case "Hello":
  echo "Number 2";
  break;
case "hello":
  echo "Number 3";
  break;
default:
  echo "No number between 1 and 3";
}
echo "<br/>";
 
$names = array("aaa","bbb","ccc");
echo $names[1];
echo "<br/>";
$ages = array("aaa"=>18,"bbb"=>19,"ccc"=>28);
echo $ages["ccc"];
echo "<br/>";
 
$families = array(
"mmm"=>array("name"=>"bruce","age"=>18,"sex"=>true),
"nnn"=>array("name"=>"kim","age"=>19,"sex"=>false),
"kkk"=>array("name"=>"yage","age"=>20,"sex"=>true)
);
echo "姓名：".$families["kkk"]["name"]."，性别：".$families["kkk"]["sex"];
echo "<br/>";
if($families["nnn"]["sex"])
{
    echo $families["nnn"]["name"]."的性别为男性！";
}
else
{
    echo $families["nnn"]["name"]."的性别为女性！";
}
echo "<br/>PHP中的while循环、do while循环、for 循环与其他语言都类似！下面重点介绍 foreach 循环：<br/>";
foreach($names as $nameItem)
{
    echo "姓名：".$nameItem."<br/>";
}
echo "<br/>";
function Add($num1,$num2)
{
    return $num1 + $num2;
}
echo "3.5+5=".Add(3.5,5 /* 如果第二个参数为 true，则结果为4，因为 true 的整数值为1 */);
echo "<br/>";
echo date("y/m/d");
echo "<br/>";
/*
语法
mktime(hour,minute,second,month,day,year,is_dst)
*/
$tomorrow = mktime(0,0,0,date("m"),date("d")+1,date("Y"));
echo "Tomorrow is ".date("Y/m/d", $tomorrow);
 
?>
 
 
</div>
 
<?php
/*
include() 方法与 require() 的异同
同：服务器端引用
异：include() 函数会生成一个警告（但是脚本会继续执行），而 require() 函数会生成一个致命错误（fatal error）（在错误发生后脚本会停止执行）。
*/
require("doSubmit.php");
?>
 
<div>
<h2>读取文件</h2>
<?php
if(!file_exists("welcome.txt"))
{
    die("welcome.txt没有找到！"); /* 不往下执行服务器脚本 */
}
else
{
    $file = fopen("welcome.txt", "r") or exit("不能打开文件!");
    //Output a line of the file until the end is reached
    while(!feof($file))
      {
      echo fgets($file). "<br />";
      }
    fclose($file);
}
?>
</div>
 
<?php
require("doUpload.php");
?>
 
 
<div>
<?php
/*
语法：setcookie(name, value, expire, path, domain);
*/
if(!isset($_COOKIE["userInfo"]))
{
    setcookie("userInfo", "Alex Porter", time()+3600 /* 一个小孩后过期 */);
}
else
{
    echo "欢迎您：".$_COOKIE["userInfo"]."！<br/>";
}
 
session_start();
/*
Session 保存的Cookie名称为：PHPSESSID
*/
if(!isset($_SESSION["currentUserName"]))
{
     
    $_SESSION["currentUserName"] = "张三";
}
else
{
    echo $_SESSION["currentUserName"];
    //unset($_SESSION['currentUserName']); /* unset() 函数用于释放指定的 session 变量 */
    //session_destroy(); /* session_destroy() 函数彻底终结 session */
}
 
/*
发送邮件
语法：mail(to,subject,message,headers,parameters)
 
$to = "xxx@163.com";
$subject = "Test mail";
$message = "Hello! This is a simple email message.";
$from = "xxx@gmail.com";
$headers = "From: $from";
mail($to,$subject,$message,$headers);
echo "Mail Sent.";
 
*/
?>
</div>
 
<div>
    <div class="innerDiv">
        <h2>函数过滤</h2>
    </div>
    <div>
        <?php
             
            $num1 = 15;
            echo "类型验证：";
            if(!filter_var($num1,FILTER_VALIDATE_INT))
            {
                //FILTER_VALIDATE_INT 区分大小写
                echo "必须是整数类型！";
            }
            else
            {
                echo "您输入的整数类型合法！";
            }
            echo "<br/>";
            echo "整数范围验证：";
            $numRange = array(
                "options"=>array(
                    "min_range"=>0,
                    "max_range"=>30
                )
            );
            //注意：上面的 options、min_range、max_range 不能写错
            if(!filter_var($num1,FILTER_VALIDATE_INT, $numRange))
            {
                echo "整数必须在0和30之间！";
            }
            else
            {
                echo "您输入的整数的范围合法！";
            }
            echo "<br/>";
            function convertSpace($words)
            {
                return str_replace("_", " ", $words);
            }
            $string = "皮_特_是_一_个_好_人!";
            echo filter_var($string, FILTER_CALLBACK, array("options"=>"convertSpace"));
        ?>
    </div>
</div>
 
</body>
</html>

doSubmit.php

?
<div>
    <div class="innerDiv">
        <h2>POST提交</h2>
    </div>
    <div class="innerDiv">
        <form action="hello.php" method="post">
            姓名：<input type="text" name="name" /><br/>
            年龄：<input type="text" name="age" /><br/>
            <input type="submit" value="提交" />
        </form>
    </div>
    <div class="innerDiv">
        <h3>您提交过来的信息如下</h3>
        姓名：<?php echo isset($_POST["name"]) ? $_POST["name"] : ""; ?><br/>
        年龄：<?php echo isset($_POST["age"]) ? $_POST["age"] : ""; ?><br/>
    </div>
</div>
 
<div>
    <div class="innerDiv">
        <h2>GET提交</h2>
    </div>
    <div class="innerDiv">
        <form action="hello.php" method="get">
            姓名：<input type="text" name="name" /><br/>
            年龄：<input type="text" name="age" /><br/>
            <input type="submit" value="提交" />
        </form>
    </div>
    <div class="innerDiv">
        <h3>您提交过来的信息如下</h3>
        <?php
        /*
        PHP 的 $_REQUEST 变量包含了 $_GET, $_POST 以及 $_COOKIE 的内容。
        */
        ?>
        姓名：<?php echo isset($_GET["name"]) ? $_GET["name"] : ""; /* 也可以用 $_REQUEST["name"] 获取 */ ?><br/>
        年龄：<?php echo isset($_GET["age"]) ? $_GET["age"] : ""; ?><br/>
    </div>
</div>

doUpload.php

?
<div>
    <div class="innerDiv">
        <h2>文件上传</h2>
    </div>
    <div class="innerDiv">
        <form action="Hello.php" method="post" enctype="multipart/form-data">
            <label for="yourImages">您的照片：</label>
            <input type="file" name="yourPhotos" id="yourImages" /><br />
            <input type="submit" name="submit" value="上传" />
        </form>
    </div>
    <div class="innerDiv">
        <h3>您提交过来的信息如下</h3>
        <?php
            if($_FILES["yourPhotos"]["error"] > 0)
            {
                echo "上传出错！信息：".$_FILES["yourPhotos"]["error"]."<br/>";
            }
            else
            {
                /*
                文件名：EditPlus V3.20.400 中文绿色版.RAR
                类型：application/octet-stream
                大小：1093.7607421875KB
                存储路径：C:\WINDOWS\Temp\php2B.tmp
                */
                $currentFileName = $_FILES["yourPhotos"]["name"];
                $currentFileType = $_FILES["yourPhotos"]["type"];
                $currentFileSize = $_FILES["yourPhotos"]["size"];
                $currentFileTmp_Name = $_FILES["yourPhotos"]["tmp_name"];
 
                echo "文件名：".$currentFileName."<br/>";
                echo "类型：".$currentFileType."<br/>";
                echo "大小：".($currentFileSize/1024)."KB<br/>";
                echo "临时存储路径：".$currentFileTmp_Name."<br/>";
                 
                if (file_exists("uploadedFiles/" . $currentFileName))
                {
                    echo $currentFileName . " 已经存在！";
                }
                else
                {
                    move_uploaded_file($currentFileTmp_Name,"uploadedFiles/" . $currentFileName);
                    echo "永久存储路径：" . "uploadedFiles/" . $currentFileName;
                }
 
            }
        ?>
    </div>
</div>

谢谢浏览！

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