Php filters dangerous html code

Source: Internet
Author: User
Use PHP to filter the code that may be used in html to introduce external dangerous content. Sometimes, users must submit html content to enrich the information published by users. of course, some codes that may cause messy page layout are also filtered out. The following is the program code:
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, you can also add Filter
"/<(\/?) (Script | I? Frame | style | html | body | title | link | meta | \? | \ %) ([^>] *?)> /IsU ",
"/(<[^>] *) On [a-zA-Z] + \ s * = ([^>] *>)/isU ", // filter javascript on events
);
$ Tarr = array (
"",
"<\ 1 \ 2 \ 3>", // If you want to directly clear insecure labels, leave it blank.
"\ 1 \ 2 ",
);
$ Str = preg_replace ($ farr, $ tarr, $ str );
Return $ str;
}
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