strip_tags function usage of PHP common functions

A, definitions and usage

The Strip_tags () function removes the HTML, XML, and PHP tags in the string.

Strip_tags (String,allow)

Parameter description

String required. Specify the string to check.

Allow optional. Specify the allowed label. These labels will not be deleted.

Note: This function always strips HTML comments. This cannot be changed by allow parameters.

B, example

Example 1

Echo strip_tags ("Hello <b>world!</b>");

Output:

Hello world!

Example 2

Echo strip_tags ("Hello <b><i>world!</i></b>", "<b>");

Output:

Hello world!

Example 3, strip_tags () example

<?php$text = ' <p>test paragraph.</p><!--Comment--> other text '; Echo strip_tags ($text); echo "\ n" ;//Allow <p>echo strip_tags ($text, ' <p> '); >

The example above will output:

Test paragraph. Other text
<p>test paragraph.</p> Other text

Example 4:

<?php
$str = "Hello <b><i>world</i></b>!";
echo Strip_tags ($STR);
echo ' <br/> ';
Echo strip_tags ($str, ' <b><i> ');
?>

Output results:

Hello world!
Hello world!

Example 5

What if you want to use PHP to remove a specific label from an HTML tag?

This will require code to implement, as follows:

    function strip_selected_tags ($text, $tags = Array ())
    {
         $args = Func_get_args ();
        $text = Array_shift ($args);
        $tags = Func_num_args () > 2 Array_diff ($args, Array ($text)): (Array ) $tags;
        foreach ($tags as $tag) {
             if (preg_match_all ('/< '. $tag. ') [^>]*> ([^<]*) </'. $tag. ' >/iu ', $text, $found)) {
                 $text = str_replace ($found [0], $found [1], $text);
           }
       }

return Preg_replace (' < (') join (' | ', $tags). ( | |.) */>)/iu ', ', $text);
}

$str = "[url="]123[/url] ";
Echo strip_selected_tags ($str, Array (' B '));