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PHP_Bibel阅读笔记(二)--脸黑的一天(?一年)

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Release: 2016-06-23 13:08:17
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  一早上起来把50包开了,一张橙卡。。。就问还有谁。。。。。。。。。。。本命年啊,我去买红内裤还不行么。。。。

实时更新,老哥的号的30包什么都没有。。。。不过中午又开了5包,皇帝,好评啊!!!

五、代码重用与函数编写

include警告与require的错误;

大量的包含实现,可以改ini文件中的:auto_prepend_file和auto_append_file;

global关键字也是可以用在函数内的参数的;

参数的引用传递和return

1 namespace Bible\Basic\FunctionUse;2 3 include_once 'index.php';4 $value=10;5 increment1($value);6 echo $value;echo "<br/>";7 $value2=100;8 $value2=increment2($value2);9 echo $value2;echo "<br/>";
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 1 <?php 2 function increment1(&$value,$mount=1) 3 { 4     $value=$value+$mount; 5 } 6  7 function increment2($value,$mount=1) 8 { 9     $value=$value+$mount;10     return $value;11 }
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递归函数比循环慢且占用更多内存,虽然很多循环都可以用递归来代替;(在应用领域中基本不用它

六、面向对象

好玩的代码,学到些东西!

  1 <?php  2 namespace Bible\Basic\ObjectPage;  3   4 //Chapter6.P132  5   6 class Page  7 {  8     public $content;  9     public $title; 10     public $keyword; 11     public $button=array("Home"=>"http://115.159.201.78/wordpress/", 12         "Basic"=>"Section1.php" 13     ); 14      15     public function __set($name,$value) 16     { 17         $this->$name=$value; 18     } 19      20     public function Display() 21     { 22         echo "<html>\n<head>\n"; 23         $this->DisplayTitle(); 24         $this->DisplayKeywords(); 25         $this->DisplayStyles(); 26         echo "</head>\n<body>\n"; 27         $this->DisplayHeader(); 28         $this->DisplayMenu($this->button); 29         echo $this->content; 30         $this->DisplayFooter(); 31         echo "</body>\n</html>\n";    32     } 33      34     private function DisplayTitle() 35     { 36         echo "<title>".$this->title."</title>"; 37     } 38      39     private function DisplayKeywords() 40     { 41         foreach ($this->keyword as $words){ 42             echo "<meta name=\"keywords\" content=\"".$words."\"/>"; 43         } 44     } 45      46     private function DisplayStyles() 47     { 48    ?> 49      <style> 50       h1 { 51             color:white; font-size:24pt; text-align:center; 52             font-family:arial,sans-serif 53     } 54     .menu { 55         color:white; font-size:12pt; text-align:center; 56         font-family:arial,sans-serif; font-weight:bold 57     } 58     td { 59         background:black 60     } 61     p { 62         color:black; font-size:12pt; text-align:justify; 63         font-family:arial,sans-serif 64     } 65     p.foot { 66         color:white; font-size:12pt; text-align:center; 67         font-family:arial,sans-serif; font-weight:bold 68     } 69     a:link,a:visited,a:active { 70         color:white 71     } 72     </style> 73 <?php 74     } 75      76     private function DisplayHeader() 77     { 78 ?> 79   <table width="100%" cellpadding="12"  80          cellspacing="0" border="0"> 81   <tr bgcolor="black"> 82     <td align="left"><img alt="img" src="logo.png"></td> 83     <td><h1>The OOP page</h1></td> 84   </tr> 85 </table> 86 <?php  87     } 88      89     private function DisplayMenu($button) 90     { 91         echo "<table width=\"100%\" bgcolor=\"white\" 92               cellpadding=\"4\"    cellsapcing=\"4\">\n "; 93         echo "<tr>\n"; 94         $width=100/count($button); 95         while (list($name,$url)=each($button)) { 96             $this->DisplayButton($width,$name,$url, 97                 !$this->IsURLCurrentPage($url)); 98         } 99         echo "</tr>\n";100         echo "</table>\n";101     }102     103     private function IsURLCurrentPage($url)104     {105         if (strpos($_SERVER['PHP_SELF'], $url)==false){106             return false;107         } else{108             return true;109         }110     }111     112     private function DisplayButton($width,$name,$url,$active=true)113     {114         if ($active){115             echo "<td width=\"".$width."%\">116             <a href=\"".$url."\" onclick=\"blank\">117             <img src=\"w-logo-blue.png\" alt=\"".$name."\" border=\"0\" /></a>118             <a href=\"".$url."\"><span class=\"menu\">".$name."</span></a>119                 </td>";120         } else{121             echo "<td width=\"".$width."%\">122             <img  src=\"w-logo-white.png\" alt="PHP_Bibel阅读笔记(二)--脸黑的一天(?一年)" >123             <span class=\"menu\">".$name."</span></td>";            124         }        125     }126     127     private function DisplayFooter()128     {129 ?>130   <table width="100%" bgcolor="black" cellpadding="12" border="0">131   <tr>132     <td>133     <p class="foot">&copy; Andy Liang.</p>134     <p class="foot">Please visit my own site:<a href="http://115.159.201.78/wordpress/">Andy's Learning Diary</a></p>135     </td>136   </tr>137 </table>138 <?php 139     }140 }141 142 $homepage=new Page();143 $homepage->content="<p>"."I do not know what to write down, how about this?"."</p>";144 $homepage->title="You have to try OO.";145 $homepage->keyword=array("SAR","MRF");146 $homepage->Display();
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就是个默认网页的生成对象,还是有改进空间的。

然后,php写html,有点繁琐,但写完了一身爽。

标记的活用有点厉害啊,套路~

PS:上面代码中的链接不要乱点~会吓到你的。

当然,其实这种得到页面在应用中是不推荐的,只是试着练下手。

七、错误和异常处理

try{ throw new Exception() } catch{ }

PHP中,异常必须手动抛出;

try代码块和catch代码块是“绑定的”,每个try一定要有一个catch!

一个try可以有多个catch

 1 <?php 2 //Session1.Chapter7.P146 3 namespace Bible\Basic\ExceptionTry; 4  5 try { 6     throw new \ErrorException("A serious wrong has occured!", 14); 7 } 8 catch (\ErrorException $e){ 9     echo "Exceotion".$e->getCode().":".$e->getMessage()."<br/>"10         ."File:".$e->getFile()."at Line:".$e->getLine()."<br/>";11     echo $e;    12 }
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应用中,希望可以自定义异常处理:继承已有的Exception类就好,需要注意的是,一般的getMessage等是final的,不能进行重载的,只有_tostring这一个方法可以重载;

 1 class MyException extends \ErrorException 2 { 3     function _tostring() 4     { 5         return "Fatal error,sorry!"; 6     } 7 } 8  9 try {10     throw new MyException("OH", 14);11 }12 catch (MyException $e){13     echo $e->_tostring();14 }
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应用中,常常把异常处理用在最容易出错的I/O部分;格式一般都是

try{ if(!...) throw...} catch(){}

 

Session 2

(二) 使用MySQL

八、设计Web数据库

 

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