Dangerous code for php filter form submission

Dangerous code form submission for php filter form submission if the security is poor, it is easy to cause the website to be attacked because of this form submission, next, I will share two examples of dangerous code submitted by common php filter forms. For more information, see.

Example 1: The code is as follows:

Function uhtml ($ str)

{

$ Farr = array (

"/S +/", // filter unnecessary spaces

// Filter scripts and other code that may introduce malicious content or maliciously change the display layout. if you do not need to insert flash

Can joinFilter

"/<(/?) (Script | I? Frame | style | html | body | title | link | meta |? | %) ([^>] *?)> /IsU ",

"/(<[^>] *) On [a-zA-Z] + s * = ([^>] *>)/isU ", // filter javascript on events

);

$ Tarr = array (

"",

"<123>", // If you want to directly clear insecure labels, leave it blank.

"12 ",

);

$ Str = preg_replace ($ farr, $ tarr, $ str );

Return $ str;

}

For example 2, the code is as follows:

// Get post data

Function PostGet ($ str, $ post = 0)

{

Emptyempty ($ str )? Die ('para is Null'. $ str .'! '):'';

If ($ post)

{

If (get_magic_quotes_gpc ())

{

Return htmlspecialchars (isset ($ _ POST [$ str])? $ _ POST

[$ Str]: '');

}

Else

{

Return addslashes (htmlspecialchars (isset ($ _ POST [$ str])?

$ _ POST [$ str]: '');

}

}

Else

{

If (get_magic_quotes_gpc ())

{

Return htmlspecialchars (isset ($ _ GET [$ str])? $ _ GET [$ str]: '');

}

Else

{

Return addslashes (htmlspecialchars (isset ($ _ GET [$ str])?

$ _ GET [$ str]: '');

}

} // Open source code phpfensi.com

}