<?php
$file = "http://example.com";
 
$content = file_get_contents($file);
$links = array("follow"=>array(),"nofollow"=>array());
 
preg_match_all("/(<a.*>)(.*)(<\/a>)/ismU",$content,$matches,PREG_SET_ORDER);
 
if(empty($matches)){
    echo("There is no link in the file ".$file.".");
}else{
    foreach($matches as $match){
        preg_match("/href\s*=\s*[\'|\"]\s*([^\"|\']*)\s*[\'|\"]/i",$match[1],$href);
 
        if(preg_match("/rel\s*=\s*[\'|\"]\s*nofollow\s*[\'|\"]/i",$match[1])){
            $links["nofollow"][] = $href[1];
        }else{
            $links["follow"][] = $href[1];
        }
    }
 
    $output = "<h1>Nofollow links</h1>";
 
    if(empty($links["nofollow"])){
        $output .= "There is no nofollow link.";
    }else{
        $output .= "<ol type='1'>";
 
        foreach($links["nofollow"] as $link){
            $output .= "<li>".$link."</li>";
        }
 
        $output .= "</ol>";
    }
 
    $output .= "<h1>Follow links</h1>";
 
    if(empty($links["follow"])){
        $output .= "There is no follow link.";
    }else{
        $output .= "<ol type='1'>";
 
        foreach($links["follow"] as $link){
            $output .= "<li>".$link."</li>";
        }
 
        $output .= "</ol>";
    }
 
    echo($output);
}
?>

<?php
function sort_all_words_and_write_into_file($text,$file){
    preg_match_all("/[a-z0-9_\-]+/i",$text,$matches,PREG_PATTERN_ORDER);
 
    $matches = array_unique($matches[0]);
 
    natcasesort($matches);
 
    $file_content = "";
 
    while(current($matches)){
        $file_content .= current($matches);
 
        if(next($matches)){
            $file_content .= "\r\n";
        }
    }
 
    if(file_exists($file)){
        if(is_writable($file)){
            if(file_put_contents($file,$file_content)){
                return true;
            }
        }
    }else{
        if(file_put_contents($file,$file_content)){
            return true;
        }
    }
 
    return false;
}
 
$text = "A PHP example to sort all words of a text in alphabetical order and write the words into a file.";
 
sort_all_words_and_write_into_file($text,"file.txt");
?>

<?php
$word = "plugin";
 
function sort_by_matching_word($text1,$text2){
  global $word;
 
  $text1_matched_words_count = preg_match("/\b".$word."\b/i",$text1);
  $text2_matched_words_count = preg_match("/\b".$word."\b/i",$text2);
 
  if($text1_matched_words_count<$text2_matched_words_count){
    return 1;
  }elseif($text1_matched_words_count==$text2_matched_words_count){
    return 0;
  }else{
    return -1;
  }
}
 
$wordpress_plugin_running_line = "If you would like to have your running line on your Wordpress blog, so this plugin is just for you! It gives you the possibility to show one of the posts from your chosen category by the running line. So download and enjoy!";
$wordpress_plugin_explanatory_dictionary = "This plugin is used when there are words, words expressions or sentences to be explained in the posts or pages of your wordpress blog. This plugin will help the visitors to read the explanations of the words (words expressions,sentences) you need via tooltips.";
$wordpress_plugin_greetings = "Any occasion to receive greetings? So, this plugin is just for you! This Widget plugin shows a greeting image which would be uploaded for the occasion and a pop up form for receiving the greetings. It is possible to show the greetings in any post or page.";
 
$my_plugins = array($wordpress_plugin_running_line,$wordpress_plugin_explanatory_dictionary,$wordpress_plugin_greetings);
 
usort($my_plugins, 'sort_by_matching_word');
 
foreach($my_plugins as $my_plugin){
    echo("<p>".$my_plugin."</p>");
}
?>