Tutorial Find URLs in Text, Make Links

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<?php

// The Regular Expression filter
$reg_exUrl = "/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/";

// The Text you want to filter for urls
$text = "The text you want to filter goes here. http://google.com";

// Check if there is a url in the text
if(preg_match($reg_exUrl, $text, $url)) {

       // make the urls hyper links
       echo preg_replace($reg_exUrl, "<a href="{$url[0]}">{$url[0]}</a> ", $text);

} else {

       // if no urls in the text just return the text
       echo $text;

}
?>

The basic function of this is to find any URLs in the block of text and turn them into hyperlinks. It will only find URLs if they are properly formatted, meaning they have a http, https, ftp or ftps.

Check out the comments below for more solutions.

PHP Define Full Path to a File

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<?php
  echo dirname(__FILE__);
?>
Save the file as fullpath.php Upload to the folder you'd like to know the full path to Go to http://www.yoursite/lots/of/folders/fullpath.php

You'd might be surprised what shows up. Sometimes you need more than just /lots/of/folders/ as your full path to a file (e.g. .htpasswd). This script will allow you to see that.

Tutorial Find Highest Numerically Named File

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$latest = getNewest("/path/to/folder/*_bla.xml");

function getNewest($xmlfile){
   foreach (glob($xmlfile) as $filename) {
       $c = explode('_', basename($filename));
       $files[$c[0]] = $filename;
   }
   ksort($files, SORT_NUMERIC);
   $latest = array_pop($files);
   if (file_exists($latest)){
       return $latest;
   }
   return false;
}

In a folder are files named:
1_bla.xml
2_bla.xml
...
34_bla.xml

The function returns the file with the biggest numeric number:
$latest = "/path/to/folder/34_bla.xml";

Tutorial Find File Extension

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Method 1

function findexts ($filename) {

       $filename = strtolower($filename) ;

       $exts = split("[/\\.]", $filename) ;

       $n = count($exts)-1;

       $exts = $exts[$n];

       return $exts;

}

Method 2

$filename = 'mypic.gif';
$ext = pathinfo($filename, PATHINFO_EXTENSION);

Method 3

function getFileextension($file) {
       return end(explode(".", $file));
}

Preg Match All Links on a Page PHP

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Here's the basic principal behind spiders.

$html = file_get_contents('http://www.example.com');

$dom = new DOMDocument();
@$dom->loadHTML($html);

// grab all the on the page
$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");

for ($i = 0; $i < $hrefs->length; $i++) {
       $href = $hrefs->item($i);
       $url = $href->getAttribute('href');
       echo $url.'<br />';
}

Tutorial Extract Email Addresses

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Just pass the string (e.g. the body part of an email) to the function, and it returns an array of Email Addresses contained in the String.

function extract_emails_from($string) {
         preg_match_all("/[\._a-zA-Z0-9-]+@[\._a-zA-Z0-9-]+/i", $string, $matches);
         return $matches[0];
}

If you catch the return value of function in $emails, you can parse it using foreach:

foreach($emails as $email) {
    echo trim($email).'<br/>';
}

Tutorial Error Page to Handle All Errors

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This is a way to make a single error page for all errors, which is easier to update and maintain.

1) Point all error pages at one location in your .htaccess file

ErrorDocument 400 /error.php
ErrorDocument 401 /error.php
ErrorDocument 403 /error.php
ErrorDocument 404 /error.php
ErrorDocument 500 /error.php
etc.

2) PHP for error.php page in root

$status = $_SERVER['REDIRECT_STATUS'];
$codes = array(
       403 => array('403 Forbidden', 'The server has refused to fulfill your request.'),
       404 => array('404 Not Found', 'The document/file requested was not found on this server.'),
       405 => array('405 Method Not Allowed', 'The method specified in the Request-Line is not allowed for the specified resource.'),
       408 => array('408 Request Timeout', 'Your browser failed to send a request in the time allowed by the server.'),
       500 => array('500 Internal Server Error', 'The request was unsuccessful due to an unexpected condition encountered by the server.'),
       502 => array('502 Bad Gateway', 'The server received an invalid response from the upstream server while trying to fulfill the request.'),
       504 => array('504 Gateway Timeout', 'The upstream server failed to send a request in the time allowed by the server.'),
);

$title = $codes[$status][0];
$message = $codes[$status][1];
if ($title == false || strlen($status) != 3) {
       $message = 'Please supply a valid status code.';
}
// Insert headers here
echo '<h1>'.$title.'</h1>
<p>'.$message.'</p>';
// Insert footer here