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Basic knowledge of PHP object-oriented programming_PHP tutorial

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Release： 2016-07-15 13:28:49
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What we are introducing to you today is about Below we will use examples to illustrate the practical significance and application methods of using PHP object-oriented programming.

When we usually build a website with a database backend, we will consider that the program needs to be suitable for different application environments. What is different from other programming languages ​​is that in PHP, a series of specific functions are used to operate the database (if you do not use the ODBC interface). Although this is very efficient, the encapsulation is not enough. If there is a unified database interface, then we can apply it to a variety of databases without making any modifications to the program, thus greatly improving the portability and cross-platform capabilities of the program.

The completion of PHP object-oriented programming requires object encapsulation, that is, writing classes. We can achieve a simple encapsulation of the database by generating a new SQL class. For example: 

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><strong><font color="#006699"><</FONT></STRONG></SPAN><SPAN> ?  </SPAN></SPAN><LI class=""><SPAN>class SQL  </SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>var $Driver; //实际操作的数据库驱动子类  </SPAN><LI class=alt><SPAN>var $connection; //共用的数据库连接变量  </SPAN><LI class=""><SPAN>function DriverRegister($d)  </SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>if($d!="")  </SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>include_path</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>ini_get</FONT></SPAN><SPAN>("include_path");  </SPAN></SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>DriverFile</FONT></SPAN><SPAN> = $include_path."/".$d.".php";  </SPAN></SPAN><LI class=""><SPAN>//驱动的存放路径必须在PHP.ini文件中设定的INCLUDE_PATH下  </SPAN><LI class=alt><SPAN>if( file_exists( $DriverFile)) //查找驱动是否存在  </SPAN><LI class=""><SPAN>{  </SPAN><LI class=alt><SPAN>include($DriverFile);  </SPAN><LI class=""><SPAN>$this-</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></font></strong></span><span class="attribute"><font color="#ff0000">Driver</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">new</font></span><span> $d();  </span></span></li>
<li class="alt"><span>// 根据驱动名称生成相应的数据库驱动类  </span></li>
<li class=""><span>return true;  </span></li>
<li class="alt"><span>}  </span></li>
<li class=""><span>}  </span></li>
<li class="alt"><span>return false; //注册驱动失败  </span></li>
<li class=""><span>}  </span></li>
<li class="alt"><span>function Connect($host,$user,$passwd,$database)//连接数据库的函数  </span></li>
<li class=""><span>{  </span></li>
<li class="alt">
<span>$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span class="attribute"><font color="#ff0000">host</font></span><span>=$host;  </span>
</li>
<li class="">
<span>$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span class="attribute"><font color="#ff0000">user</font></span><span>=$user;  </span>
</li>
<li class="alt">
<span>$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span class="attribute"><font color="#ff0000">passwd</font></span><span>=$pas  </span>
</li>
<li class=""><span>swd;  </span></li>
<li class="alt">
<span>$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span class="attribute"><font color="#ff0000">database</font></span><span>=$d  </span>
</li>
<li class=""><span>atabase;  </span></li>
<li class="alt">
<span>$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span class="attribute"><font color="#ff0000">connection</font></span><span> = $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Connect();  </span>
</li>
<li class=""><span>}  </span></li>
<li class="alt"><span>function Close()//关闭数据库函数  </span></li>
<li class=""><span>{  </span></li>
<li class="alt">
<span>$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>close($this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>connection);  </span>
</li>
<li class=""><span>}  </span></li>
<li class="alt"><span>function Query($queryStr)//数据库字符串查询函数  </span></li>
<li class=""><span>{  </span></li>
<li class="alt">
<span>return $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>query($queryStr,$this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>connection);  </span>
</li>
<li class=""><span>}  </span></li>
<li class="alt"><span>function getRows($res)//查找行  </span></li>
<li class=""><span>{  </span></li>
<li class="alt">
<span>return $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>getRows($res);  </span>
</li>
<li class=""><span>}  </span></li>
<li class="alt"><span>function getRowsNum($res)//取得行号  </span></li>
<li class=""><span>{  </span></li>
<li class="alt">
<span>return $this-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Driver-</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> getRowsNum ($res);  </span>
</li>
<li class=""><span>}  </span></li>
<li class="alt"><span>}  </span></li>
<li class="">
<span>? </span><span class="tag"><strong><font color="#006699">></font></strong></span><span>  </span>
</li>
</ol>
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I hope that the knowledge about PHP object-oriented programming introduced above will be useful to everyone. helped.


www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446417.htmlTechArticleWhat we will introduce to you today is about the following. We will use examples to illustrate the practical significance and use of PHP object-oriented programming. Application method. We usually work on a database background...
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