php function Preg_match_all () about how to use the _php tutorial

InThe following is an example of converting URL link addresses in text to HTML code. Code 6.4 is an example of PHP function Preg_match_all ().

Code 6.4 Convert the link address in the text to HTML

 
 

  
  

  
< ? PHP
  
  

  
Function: Convert the link address in text to HTML
  
  

  
Input: String
  
  

  
Output: String
  
  

  
function url2html ($text)
  
  

  
{
  
  

  
Match a URL until a blank is present
  
  

  
Preg_match_all ("/http://?[ ^s]+/i "
, $text, $links);
  
  

  
Set page display URL address length
  
  

  
$ max_size  =   + ; 
  
  

  
foreach ($links [0] as $link _url)
  
  

  
{
  
  

  
Calculates the length of the URL. If the setting exceeds $max_size, it is shortened.
  
  

  
$ Len  =  strlen ($link _url); 
  
  

  
if ($len  >  $max _size)
  
  

  
{
  
  

  
$ Link_text  =  substr ($link _url, 0, $max _size). " ..."; 
  
  

  
} else {
  
  

  
$ Link_text = $link _url; 
  
  

  
}
  
  

  
Generate HTML text
  
  

  
$ text  =  Str_replace ($link _url, "
<    a  href=' $link _url '>$link _text    a>", $text);  
  
  

  
}
  
  

  
return $text;
  
  

  
}
  
  

  
Running an instance
  
  

  
$ Str = "This is a multiline text with multiple URL link addresses."
Welcome to visit http://www.taoboor.com ";
  
  

  
Print url2html ($STR);
  
  

  
/* Output Results
  
  

  
This is a multiline text with multiple URL link addresses
。 Welcome to visit <   a   href=' http://www.taoboor.com '  >  
  
  

  
http://www.taoboor.com   a >  
  
  

  
*/
  
  

  
?>  
 
 

I hope you can fully grasp the application of this function by using the example of PHP function Preg_match_all () above.

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