Php parse links/emails

Question 1

I am wondering if there is a simple snippet which converts links of any kind:

http://www.cnn.com to <a href="http://www.cnn.com">http://www.cnn.com</a>
cnn.com to <a href="http://www.cnn.com">cnn.com</a>
www.cnn.com to <a href="http://www.cnn.com">www.cnn.com</a>
[email protected] to  to <a href="mailto:mailto:[email protected]">mailto:[email protected]</a>

I do not want to use any PHP5 specific library.

Thank you for your time.

UPDATE I have updated the above text to what i want to convert it to. Please note that the href tag and the text are different for case 2 and 3.

UPDATE2 Hows does gmail chat do it? Theirs is pretty smart and works only for real domains names. e.g. a.ly works but a.cb does not work.

Question 2

yes , http://www.gidforums.com/t-1816.html

<?php
/**
   NAME        : autolink()
   VERSION     : 1.0
   AUTHOR      : J de Silva
   DESCRIPTION : returns VOID; handles converting
                 URLs into clickable links off a string.
   TYPE        : functions
   ======================================*/

function autolink( &$text, $target='_blank', $nofollow=true )
{
  // grab anything that looks like a URL...
  $urls  =  _autolink_find_URLS( $text );
  if( !empty($urls) ) // i.e. there were some URLS found in the text
  {
    array_walk( $urls, '_autolink_create_html_tags', array('target'=>$target, 'nofollow'=>$nofollow) );
    $text  =  strtr( $text, $urls );
  }
}

function _autolink_find_URLS( $text )
{
  // build the patterns
  $scheme         =       '(http://|https://)';
  $www            =       'www.';
  $ip             =       'd{1,3}.d{1,3}.d{1,3}.d{1,3}';
  $subdomain      =       '[-a-z0-9_]+.';
  $name           =       '[a-z][-a-z0-9]+.';
  $tld            =       '[a-z]+(.[a-z]{2,2})?';
  $the_rest       =       '/?[a-z0-9._/~#&=;%+?-]+[a-z0-9/#=?]{1,1}';            
  $pattern        =       "$scheme?(?(1)($ip|($subdomain)?$name$tld)|($www$name$tld))$the_rest";

  $pattern        =       '/'.$pattern.'/is';
  $c              =       preg_match_all( $pattern, $text, $m );
  unset( $text, $scheme, $www, $ip, $subdomain, $name, $tld, $the_rest, $pattern );
  if( $c )
  {
    return( array_flip($m[0]) );
  }
  return( array() );
}

function _autolink_create_html_tags( &$value, $key, $other=null )
{
  $target = $nofollow = null;
  if( is_array($other) )
  {
    $target      =  ( $other['target']   ? " target="$other[target]"" : null );
    // see: http://www.google.com/googleblog/2005/01/preventing-comment-spam.html
    $nofollow    =  ( $other['nofollow'] ? ' rel="nofollow"'            : null );     
  }
  $value = "<a href="$key"$target$nofollow>$key</a>";
} 

?>

Question 3

This will work only for non-nested parentheses:

    $regex = <<<HERE
    /  "  ( (?:[^"\\]++|\\.)*+ ) "
     | '  ( (?:[^'\\]++|\\.)*+ ) '
     | ( ( [^)]*                  ) )
     | [s,]+
    /x
    HERE;

    $tags = preg_split($regex, $str, -1,
                         PREG_SPLIT_NO_EMPTY
                       | PREG_SPLIT_DELIM_CAPTURE);

The ++ and *+ will consume as much as they can and give nothing back for backtracking. This technique is described in perlre(1) as the most efficient way to do this kind of matching.

Question 4

The standard disclaimer applies: Parsing HTML with regular expressions is not ideal. Success depends on the well-formedness of the input on a character-by-character level. If you cannot guarantee this, the regex will fail to do the Right Thing at some point.

Having said that:

<ab[^>]*>(.*?)</a>   // match group one will contain the link text

Question 5

$url = 'http://api.microsofttranslator.com/V2/Ajax.svc/Translate?text=siapa+rektor+ipb&appId=58C40548A812ED699C35664525D8A8104D3006D2&from=id&to=en';

// using file_get_contents function
$content = file_get_contents($url);
echo $content;
#output# "who is the Rector of the University"

// using file function // read line by line in array
$content = file($url);
print_r($content);

#output# Array (0] => ?"who is the Rector of the University")

// using cURL
$ch = curl_init($url);  
curl_setopt($ch, CURLOPT_HEADER, 0);  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
$content = curl_exec($ch);
echo $content;
#output# "who is the Rector of the University"

Question 6

You should be able to do

http_build_url($parse)

NOTE: http_build_url is only available by installing pecl_http.

According to the docs it's designed specifically to handle the output from parse_url. Both functions handle anchors, query params, etc so there are no "other properties not mentioned on the $url".

To add http:// when it's missing, use a basic check before parsing it:

if (strpos($url, "http://") != 0)
    $url = "http://$url";

Php parse links/emails

Answers

php,regex

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