PHPstrip_tags to retain multiple HTML tags, strip_tags tag_php tutorial

PHPstrip_tags: the strip_tags label. PHPstrip_tags: how to retain multiple HTML tags. This document describes how to retain multiple HTML tags by using the PHPstrip_tags function, you can use the second parameter to set the method for retaining multiple HTML tags without deleting PHP strip_tags. the strip_tags tag

This article describes how to retain multiple HTML tags by using the PHP strip_tags function. you can use the second parameter to set tags that do not need to be deleted, mainly involving the second parameter of strip_tags.

Strip_tags function

Syntax
String strip_tags (string str [, string allowable_tags])
Returns a string that removes HTML tags. you can use the second parameter to set tags that do not need to be deleted.

Usage:

Premise: if there is such a string,

The code is as follows:
$ Str ="

I'm fromHelping customers

";

1. do not retain any HTML tags. the code will be like this:
The code is as follows:
Echo strip_tags ($ str );
// Output: I am from the customer center

2. if only one tag is retained, you only need to write the string to the second parameter of strip_tags:

The code is as follows:
Echo strip_tags ($ str ,"");
// Output: I am from the customer center

3. retain

And... Multiple tags, separated by spaces, must be written to the second parameter of strip_tags:

The code is as follows:
Echo strip_tags ($ str ,"

");
// Output:

I'm fromHelping customers

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

This requires code implementation, as shown below:

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.        '[^>]*>([^<]*)
   /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'));

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