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Text to HTML converter (PHP 4+) (See related posts)

Simple function to convert a text into formatted HTML in PHP. The function implements some text cleanups (double space removal) and accepts some HTML in the text, like links (a href), lists (ul, ol), blockquotes and tables. This makes it perfect for use inside custom-made blogging engines and CMSs. There's also an implementation of case-insensitive search/replace for php < 5.

<?php

function stri_replace( $find, $replace, $string ) {
// Case-insensitive str_replace()

  $parts = explode( strtolower($find), strtolower($string) );

  $pos = 0;

  foreach( $parts as $key=>$part ){
    $parts[ $key ] = substr($string, $pos, strlen($part));
    $pos += strlen($part) + strlen($find);
  }

  return( join( $replace, $parts ) );
}


function txt2html($txt) {
// Transforms txt in html

  //Kills double spaces and spaces inside tags.
  while( !( strpos($txt,'  ') === FALSE ) ) $txt = str_replace('  ',' ',$txt);
  $txt = str_replace(' >','>',$txt);
  $txt = str_replace('< ','<',$txt);

  //Transforms accents in html entities.
  $txt = htmlentities($txt);

  //We need some HTML entities back!
  $txt = str_replace('&quot;','"',$txt);
  $txt = str_replace('&lt;','<',$txt);
  $txt = str_replace('&gt;','>',$txt);
  $txt = str_replace('&amp;','&',$txt);

  //Ajdusts links - anything starting with HTTP opens in a new window
  $txt = stri_replace("<a href=\"http://","<a target=\"_blank\" href=\"http://",$txt);
  $txt = stri_replace("<a href=http://","<a target=\"_blank\" href=http://",$txt);

  //Basic formatting
  $eol = ( strpos($txt,"\r") === FALSE ) ? "\n" : "\r\n";
  $html = '<p>'.str_replace("$eol$eol","</p><p>",$txt).'</p>';
  $html = str_replace("$eol","<br />\n",$html);
  $html = str_replace("</p>","</p>\n\n",$html);
  $html = str_replace("<p></p>","<p>&nbsp;</p>",$html);

  //Wipes <br> after block tags (for when the user includes some html in the text).
  $wipebr = Array("table","tr","td","blockquote","ul","ol","li");

  for($x = 0; $x < count($wipebr); $x++) {

    $tag = $wipebr[$x];
    $html = stri_replace("<$tag><br />","<$tag>",$html);
    $html = stri_replace("</$tag><br />","</$tag>",$html);

  }

  return $html;
}

?>
to html php strings by fzero on Tue Jun 20 19:01:21 -0400 2006

Comments on this post

Nikolas posts on Sep 04, 2006 at 08:28
You can replace that part :

while( !( strpos($txt,'  ') === FALSE ) ) $txt = str_replace('  ',' ',$txt);


with 

if( !( strpos($txt,'  ') === FALSE ) ) $txt = str_replace('  ',' ',$txt);


It is not a big improvment, but as str_replace is replacing all the matches you don't need a while statement
cipy3 posts on Apr 15, 2007 at 17:27
This is useful. Thank you.
joakimcs posts on Aug 03, 2007 at 11:18
When drawing on a resource encoded UTF8 in with multibyte chars - such as the norwegian "æ", "ø" and "å" - I inserted:
$txt = utf8_decode($txt);

just before
$txt = htmlentities($txt);

to avoid output such as "blÃ¥bærsyltetøy" instead of "blåbærsyltetøy".
Gera posts on Aug 27, 2007 at 18:50
Hello. Would someone please please help me with this topic (I've been looking around and no answers so far). Thank you so much in advance.

This code converts a text file into html via php. Everything is fine it it is just the urls from the text file that have an extra <br/>. When the links are translated into html the output this way:


<h3></h3>



Title of the link one
http://www.mysite.com/clients/client01<br</a> />


Title of the link two
http://mysite.com/clients/client02<br</a> />


This information relates to the link 3:
http://mysite.com/clients/client03<br</a> />

-------------------

and this is the php file:


<?php
// set source file name and path
$source = "test2.txt";

// read raw text as array
$raw = file($source) or die("Cannot read file");

// retrieve first and second lines (title and author)
$slug = array_shift($raw);
$byline = array_shift($raw);

// join remaining data into string
$data = join('', $raw);

// replace special characters with HTML entities
// replace line breaks with

$html = nl2br(htmlspecialchars($data));

// replace multiple spaces with single spaces
$html = preg_replace('/\s\s+/', ' ', $html);

// replace URLs with elements
$html = preg_replace('/\s(\w+:\/\/)(\S+)/', '\\1\\2', $html);

?>

<h3><?php echo $title; ?></h3>

<?php
echo $html;
?>

--------------------------


I just don't see where is the mistake, why this:

I hope someone can give me a hand.

Thank you so much in advance.

Ger

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