How to make a simple blog in PHP

Recently, I had time to look at some PHP code.

The first is the integrated environment

First pass, phpMyAdminCreate a blogsurface.

Pure interface operation, the process is relatively simple. It should be noted that id is the primary key, and Set the auto_increnent option to indicate that the field will automatically increment when it is empty. Other fields are more casual, just pay attention to the type and length.

Create a data connection                                                                                                     conn.php

file.

<?php
    @mysql_connect("127.0.0.1:3306","root","") or die("mysql数据库连接失败");
    @mysql_select_db("test")or die("db连接失败");mysql_query("set names &#39;gbk&#39;");
?>

　mysqlThe default user name is

root

, the password is empty, the ## created here

#blog

is in the test library, so it needs to be connected to the test library. Addblog                                         

at./wamp/www/blog/ Create the add.php file in the

directory.

<a href="index.php"><B>index</B></a>
<a href="add.php"><B>add blog</B></a>
<hr>
<?php
    include("conn.php"); //引入连接数据库
    if (!empty($_POST[&#39;sub&#39;])) {    
        $title = $_POST[&#39;title&#39;];  //获取title表单内容
        $con = $_POST[&#39;con&#39;];      //获取contents表单内容
        $sql= "insert into blog values(null,&#39;0&#39;,&#39;$title&#39;,now(),&#39;$con&#39;)";    
        mysql_query($sql);    
        echo "insert success!";
}?>
<form action="add.php" method="post">
    title   :<br>
    <input type="text" name="title"><br><br>
    contents:<br>
    <textarea rows="5" cols="50" name="con"></textarea><br><br>
    <input type="submit"  name="sub" value="submit">
</form>

This code is divided into two parts, the upper part is the PHP code,

include ## The
# (or

require) statement will retrieve all text present in the specified file /Code / tag and copy it to a file using the include statement. Then, if it is judged that the content of name='sub' in the form is not empty, the content of the form will be obtained, and then $sql will be executed. statement, null

means id is empty (incremented), now() means taking the current date, $title and $con take the content submitted by the user in the form. Finallyeche prompts for successful insertion. The lower part is a simple HTML code, used to implement a blog form submission Function.

 创建blog的首页                          

在./wamp/www/blog/目录下创建index.php文件。

<a href="index.php"><B>index</B></a>
<a href="add.php"><B>add blog</B></a>
<br><br>
<form action="" method="get" style=&#39;align:"right"&#39;>
    <input type="text" name="keys" >
    <input type="submit" name="subs" >
</form>
<hr>
<?php
    include("conn.php"); //引入连接数据库
       if (!empty($_GET[&#39;keys&#39;])) {        
       $key = $_GET[&#39;keys&#39;];        
       $w = " title like &#39;%$key%&#39;";
    }else{        
    $w=1;
    }    
    $sql ="select * from blog where $w order by id desc limit 5";    
    $query = mysql_query($sql);    
    while ($rs = mysql_fetch_array($query)) {
?>
<h2>title: <a href="view.php?id=<?php echo $rs[&#39;id&#39;]; ?>"><?php echo $rs[&#39;title&#39;]; ?></a>
    | <a href="edit.php?id=<?php echo $rs[&#39;id&#39;]; ?>">edit</a> 
    | <a href="del.php?id=<?php echo $rs[&#39;id&#39;]; ?>">delete</a> |
</h2>
<li>date: <?php echo $rs[&#39;data&#39;]; ?></li>
<!--截取内容展示长度-->
<p>contents:<?php echo iconv_substr($rs[&#39;contents&#39;],0,30,"gbk"); ?>...</p>  
<hr>
<?php
};?>

　　该页面包含有的功能还是比较多的。

　　首先是一个搜索表单，通过if判断搜索表单的内容是否为空，如果不为空，通过输入关键字匹配文章的标题并显示结果；如果为空查询所有blog内容，并循环显示每一篇文章的标题、日期、正文。点击标题会链接到该篇blog的详细页面。每一篇文章提供“编辑”和“删除”功能。

　　mysql_query()用于执行sql语句。mysql_fetch_arry()将返回的数据生成数组，这样就可以像操作数组一样，操作数据库中的每一条数据了。

　　然后是正文的显示，通过 iconv_substr() 函数提取正文前30个字符。

 查看blog                                                                                                             

在./wamp/www/blog/目录下创建view.php文件。

<a href="index.php"><B>index</B></a>
<a href="add.php"><B>add blog</B></a>
<hr>
<?php
include("conn.php"); //引入连接数据库
    if (!empty($_GET[&#39;id&#39;])) {        
    $id = $_GET[&#39;id&#39;];        
    $sql ="select * from blog  where id=&#39;$id&#39; ";    
        $query = mysql_query($sql);        
        $rs = mysql_fetch_array($query);        
        $sqlup = "update blog set hits=hits+1 where id=&#39;$id&#39;";        
        mysql_query($sqlup);
    }?>
<h2 id="title-nbsp-php-nbsp-echo-nbsp-rs-title-nbsp">title: <?php echo $rs[&#39;title&#39;];?> </h2>
<h3>date: <?php echo $rs[&#39;data&#39;];?>  
click number: <?php echo $rs[&#39;hits&#39;]; ?></h3>
<hr>
<p>contents:<?php echo $rs[&#39;contents&#39;]; ?></p>

 　　blog的正文实现比较简单，通过get请求获取blog的id，然后通过sql语句将该id对应的标题、日期和正文查询出来并显示。

　　并外一个小功能是显示了一个简单的计数器，每刷新页面，点击数加1。

 编辑blog                                                                                                         

在./wamp/www/blog/目录下创建edit.php文件。

<a href="index.php"><B>index</B></a>
<a href="add.php"><B>add blog</B></a>
<hr>
<?php
    include("conn.php"); //引入连接数据库
//获取数据库表数据if (!empty($_GET[&#39;id&#39;])) {    
    $edit = $_GET[&#39;id&#39;];    
    $sql = "select * from blog where id=&#39;$edit&#39;";    
    $query = mysql_query($sql);    
    $rs = mysql_fetch_array($query);
}//更新数据库表数据if (!empty($_POST[&#39;sub&#39;])) {    
        $title = $_POST[&#39;title&#39;];  //获取title表单内容
    $con = $_POST[&#39;con&#39;];      //获取contents表单内容
    $hid = $_POST[&#39;hid&#39;]; 
    $sql= "update blog set title=&#39;$title&#39;, contents=&#39;$con&#39; where id=&#39;$hid&#39; ";    
    mysql_query($sql);    
    echo "<script>alert(&#39;update success.&#39;);location.href=&#39;index.php&#39;</script>";
}?>
<form action="edit.php" method="post">
    <input type="hidden" name="hid" value="<?php echo $rs[&#39;id&#39;];?>">
    title   :<br>
    <input type="text" name="title" value="<?php echo $rs[&#39;title&#39;];?>">
    <br><br>
    contents:<br>
    <textarea rows="5" cols="50" name="con" ><?php echo $rs[&#39;contents&#39;];?></textarea><br><br>
    <input type="submit"  name="sub" value="submit">
</form>

 　　编辑blog的功能相对复杂一些。分两部操作，第一步先将blog的标题和正文查询出来，并显示到输入框。第二步将编辑好的内容再更新到数据库中。

 删除blog                                                                                                  

在./wamp/www/blog/目录下创建del.php文件。

<a href="index.php"><B>index</B></a>
<a href="add.php"><B>add blog</B></a>
<hr>
<?php    
    include("conn.php"); //引入连接数据库
    if (!empty($_GET[&#39;id&#39;])) {        
             $del = $_GET[&#39;id&#39;];  //删除blog
        $sql= "delete from blog where id=&#39;$del&#39; ";        
        mysql_query($sql);        
        echo "delete success!";
}?>

 　　最后是实现blog的删除功能，通过id将该条blog的查询出来并显示。

 因为所有页面没有使用前端样式有美化，很丑就不贴图了。功能还算完美。在此记录，算做PHP学习的整理。

=======================================================

另外，虽然每个语言都有优缺点，这里还是忍不住要吐槽一下PHP的两个不好之处。

1、符号不好写， “$” 、“ ->” 、 “=>”。这些符号虽然并没有增加代码语法的理解难度。但敲起来具恶心。每次在打“$”符号的时候，都要眼看键盘按着shift键找4在哪儿。

2、php与html的混编在我看来也不是太优雅。

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