Summarize how PHP deletes content inside HTML tags and tags

Often grilled others site article pit people; I mean the kind of bulk collection of the not to see the content, but will be used to delete the HTML tag function; Here are 3 different ways to use it;

$str = ' <div><p> here is P tag </p><a href= "" > here is a tag </a>< Br></div> ';

1: Delete all or keep the specified HTML tag

PHP comes with a function strip_tags to meet the requirements,

Method of Use: Strip_tags (String,allow);

String: Strings that need to be processed;

Allow: You need to keep the specified label, you can write more than one;

<?php Echo strip_tags ($str, ' <p><a> '); ?>//Output:<p> here is P tag </p><a href= "" > here is a tag </a>

The advantage of the secondary function is that it is simple and rough, but the disadvantage is obvious, if there is a lot of labels, and I just want to delete one of the specified one, and write a lot of labels that need to be kept;

2: Delete the specified HTML tag

Method of Use: Strip_html_tags ($tags, $STR);

$tags: Label to delete (array format)

$STR: The string to be processed;

<?php function Strip_html_tags ($tags, $str) {$html =array (); foreach ($tags as $tag) {$html []=]/(< (?: \ /". $tag." | ". $tag. ")        [^>]*>)/I ";     } $data =preg_replace ($html, ", $STR);       } Echo strip_html_tags (Array (' P ', ' img '), $STR); ?>//Output <div> here is P label <a href= "" > here is a tag </a><br></div>;

3: Delete the contents of tags and labels

Method of Use: Strip_html_tags ($tags, $STR);

$tags: Label to delete (array format)

$STR: The string to be processed;

<?php function Strip_html_tags ($tags, $str) {$html =array (); foreach ($tags as $tag) {$html []= '/(< $tag. *?>[\s|\s]*?<\/'. $tag. '        >)/';    } $data =preg_replace ($html, ", $STR);       } Echo strip_html_tags (Array (' A ', ' img '), $STR); ?>//Output <div><p> here is the P tag </p><br></div>;

Many web site articles will bring the site name and links, such as <a href= "http://www.baijunyao.com" > Bai Jun Remote Blog </a>; This function is the tyranny of this; Do not take this function to collect this station AH, or promise not to kill you;

4: The ultimate function, delete the specified label, delete or retain the contents of the tag;

Method of Use: Strip_html_tags ($tags, $str, $content);

$tags: Label to delete (array format)

$STR: The string to be processed;

$ontent: Whether to delete content within a label 0 preserve content 1 do not preserve content

  <?php    /**     *  delete a specified label and content       *  @param  array  $tags   Array of tags to delete      * @ param string  $str   Data sources      *  @param  string  $content   Whether to delete content within tags   default to 0 reserved content     1 do not keep content      *  @return   String     */    function strip_html_tags ($tags, $STR, $ content=0) {        if ($content) {              $html =array ();             foreach  ($tags  as  $tag)  {                  $html []= '/(< '. $tag. ') *?>[\s|\s]*?<\/'. $tag. ' >)/';             }            $ Data=preg_replace ($html, ", $str);        }else{              $html =array ();             foreach  ($tags  as  $tag)  {                  $html []=]/(< (?: \ /". $tag." | ". $tag. ") [^>]*>)/I ";            }              $data =preg_replace ($html,  ",  $str);         }        return  $data;     }    echo strip_html_tags (Array (' a '), $STR, 1);    ?>   //Output <dIv><p> here is the P tag </p><br></div>; 

The front is so much, in fact, the last function is dry;

Do not look at the following this one, nothing but a good color, I mainly take the picture as the cover of the article;

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Summarize how PHP deletes content inside HTML tags and tags