Answers to frequently asked questions about PHP_PHP Tutorial

In PHP4.2 and later versions, register_global defaults to off
If you want to get the variables submitted from another page:
Method 1: Find it in PHP.ini register_global, and set it to on.
Method 2: Put this extract($_POST);extract($_GET); at the front of the receiving web page (note that there must be Session_Start() before extract($_SESSION)) .
Method 3: Read variables $a=$_GET["a"];$b=$_POST["b"], etc. one by one. Although this method is troublesome, it is safer.

PHP code:
<font color=&quot;#000000&quot;><code><font color=&quot;#000000&quot;><br><font face=&quot;新宋体&quot; color=&quot;#0000bb&quot;><?PHP <br>Ob_Start</font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>();<br></font><font color=&quot;#0000bb&quot;>Session_Start</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>();<br>Echo </font><font color=&quot;#dd0000&quot;>&quot;<pre class=&quot;brush:php;toolbar:false&quot;>&quot;</pre></font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>;<br>Echo </font><font color=&quot;#dd0000&quot;>&quot;本页得到的_GET变量有:&quot;</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>;<br></font><font color=&quot;#0000bb&quot;>Print_R</font><font color=&quot;#007700&quot;>(</font><font color=&quot;#0000bb&quot;>$_GET</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>);<br>Echo </font><font color=&quot;#dd0000&quot;>&quot;本页得到的_POST变量有:&quot;</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>;<br></font><font color=&quot;#0000bb&quot;>Print_R</font><font color=&quot;#007700&quot;>(</font><font color=&quot;#0000bb&quot;>$_POST</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>);<br>Echo </font><font color=&quot;#dd0000&quot;>&quot;本页得到的_COOKIE变量有:&quot;</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>;<br></font><font color=&quot;#0000bb&quot;>Print_R</font><font color=&quot;#007700&quot;>(</font><font color=&quot;#0000bb&quot;>$_COOKIE</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>);<br>Echo </font><font color=&quot;#dd0000&quot;>&quot;本页得到的_SESSION变量有:&quot;</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>;<br></font><font color=&quot;#0000bb&quot;>Print_R</font><font color=&quot;#007700&quot;>(</font><font color=&quot;#0000bb&quot;>$_SESSION</font></font><font face=&quot;新宋体&quot;><font color=&quot;#007700&quot;>);<br>Echo </font><font color=&quot;#dd0000&quot;>&quot;&quot;</font></font><font face=&quot;新宋体&quot; color=&quot;#007700&quot;>;<br></font><font face=&quot;新宋体&quot; color=&quot;#0000bb&quot;>?><br></font></font><br>Ob_Start();
Session_Start

PHP代码:
<font color=&quot;#000000&quot;><br><font color=&quot;#0000bb&quot;><?php <br>$Var</font><font color=&quot;#007700&quot;>=</font><font color=&quot;#dd0000&quot;>&quot;hello php&quot;</font><font color=&quot;#007700&quot;>;</font><font color=&quot;#ff8000&quot;>//修改为$Var=&quot;     hello php&quot;;试试得到什么结果<br></font><font color=&quot;#0000bb&quot;>$post</font><font color=&quot;#007700&quot;>= </font><font color=&quot;#dd0000&quot;>&quot;receive.php?Name=&quot;</font><font color=&quot;#007700&quot;>.</font><font color=&quot;#0000bb&quot;>$Var</font><font color=&quot;#007700&quot;>;<br></font><font color=&quot;#0000bb&quot;>header</font><font color=&quot;#007700&quot;>(</font><font color=&quot;#dd0000&quot;>&quot;location:$post&quot;</font><font color=&quot;#007700&quot;>);<br></font><font color=&quot;#0000bb&quot;>?><br></font></font>

();

Echo

""

;

?>

PHP代码:
<font color=&quot;#000000&quot;><br><font color=&quot;#0000bb&quot;><?PHP <br></font><font color=&quot;#007700&quot;>Echo </font><font color=&quot;#dd0000&quot;>&quot;<pre class=&quot;brush:php;toolbar:false&quot;>&quot;</pre></font><font color=&quot;#007700&quot;>;<br>Echo   </font><font color=&quot;#0000bb&quot;>$_GET</font><font color=&quot;#007700&quot;>[</font><font color=&quot;#dd0000&quot;>&quot;Name&quot;</font><font color=&quot;#007700&quot;>];<br>Echo </font><font color=&quot;#dd0000&quot;>&quot;</font></font>

Why when I send variables to another web page, I only get the first half, and all the ones starting with spaces are lost

---

Contents of receive.php:

PHP代码:
<font color=&quot;#000000&quot;><br><font color=&quot;#0000bb&quot;><?php <br>$Var</font><font color=&quot;#007700&quot;>=</font><font color=&quot;#dd0000&quot;>&quot;hello php&quot;</font><font color=&quot;#007700&quot;>;<br></font><font color=&quot;#0000bb&quot;>$post</font><font color=&quot;#007700&quot;>= </font><font color=&quot;#dd0000&quot;>&quot;receive.php?Name=&quot;</font><font color=&quot;#007700&quot;>.</font><font color=&quot;#0000bb&quot;>urlencode</font><font color=&quot;#007700&quot;>(</font><font color=&quot;#0000bb&quot;>$Var</font><font color=&quot;#007700&quot;>);<br></font><font color=&quot;#0000bb&quot;>header</font><font color=&quot;#007700&quot;>(</font><font color=&quot;#dd0000&quot;>&quot;location:$post&quot;</font><font color=&quot;#007700&quot;>);<br></font><font color=&quot;#0000bb&quot;>?><br></font></font>

"

;

?>

The correct way is:

You don’t need to use Urldecode() on the receiving page, the variables will be automatically encoded.Standardize your SQL statements

Add "`" in front of tables and fields, so that they will not be misused

http://www.bkjia.com/PHPjc/446874.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446874.htmlTechArticleIn PHP4.2 and later versions, register_global defaults to off. If you want to get the variables submitted from another page: Method One: Find register_global in PHP.ini and set it to on. Method two: After connecting...