How does PHP strip_tags retain multiple HTML tags

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Strip_tags function

Grammar

String strip_tags (string str [, string allowable_tags])

Returns a string with the HTML tag removed; you can use the second parameter to set the tag that does not need to be deleted.

How to use it:

Premise: if there is such a string now

The copy code is as follows:

$str = "

I come from

"

1, do not retain any HTML tags, the code would look like this:

The copy code is as follows:

Echo strip_tags ($str)

/ / output: I am from

2. If you keep only one tag, you only need to write the string to the second parameter of strip_tags:

The copy code is as follows:

Echo strip_tags ($str, "")

/ / output: I am from

3, to keep

With. Multiple tags. You only need to separate multiple tags with spaces and write them to the second parameter of strip_tags:

The copy code is as follows:

Echo strip_tags ($str, "

")

/ / output:

I come from

What if you want to use php to delete a specific tag in a html tag?

This requires 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 ('/] * >) ([^)