Useful snippets for php developers

by Jean. 6 Comments -

When developing websites, apps or blogs, code snippets can be a real time saver. Today, I’m sharing super useful PHP snippets that I’ve collected over the past months. Enjoy!

Find out if your email has been read

When sending emails, you might want to be able to find out if your email has been read. Here’s a very interesting snippet which log the IP address which read your email, as well as the actual date and time.

<?
error_reporting(0);
Header("Content-Type: image/jpeg");

//Get IP
if (!empty($_SERVER['HTTP_CLIENT_IP']))
{
  $ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
{
  $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
  $ip=$_SERVER['REMOTE_ADDR'];
}

//Time
$actual_time = time();
$actual_day = date('Y.m.d', $actual_time);
$actual_day_chart = date('d/m/y', $actual_time);
$actual_hour = date('H:i:s', $actual_time);

//GET Browser
$browser = $_SERVER['HTTP_USER_AGENT'];
    
//LOG
$myFile = "log.txt";
$fh = fopen($myFile, 'a+');
$stringData = $actual_day . ' ' . $actual_hour . ' ' . $ip . ' ' . $browser . ' ' . "\r\n";
fwrite($fh, $stringData);
fclose($fh);

//Generate Image (Es. dimesion is 1x1)
$newimage = ImageCreate(1,1);
$grigio = ImageColorAllocate($newimage,255,255,255);
ImageJPEG($newimage);
ImageDestroy($newimage);
	
?>

Source: http://www.emoticode.net/php/code-to-find-out-if-…

Extract keywords from a webpage

The title said it all: A great code snippet to easily extract meta keywords from any webpage.

$meta = get_meta_tags('http://www.emoticode.net/');
$keywords = $meta['keywords'];
// Split keywords
$keywords = explode(',', $keywords );
// Trim them
$keywords = array_map( 'trim', $keywords );
// Remove empty values
$keywords = array_filter( $keywords );

print_r( $keywords );

Source: http://www.emoticode.net/php/extract-keywords-from-any-webpage.html

Find All Links on a Page

Using the DOM, you can easily grab all links from any webpage. Here’s a working example:

$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 />';
}

Source: http://snipplr.com/view/70489/find-all-links-on-a-page/

Auto convert URL into clickable hyperlink

In wordpress, if you want to auto convert all URLs in your string into clickable hyperlinks, you can actually do it using the built-in function make_clickable(). If you need to do that outside of wordpress, you can refer to the function’s source code at wp-includes/formatting.php:

function _make_url_clickable_cb($matches) {
	$ret = '';
	$url = $matches[2];
 
	if ( empty($url) )
		return $matches[0];
	// removed trailing [.,;:] from URL
	if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) {
		$ret = substr($url, -1);
		$url = substr($url, 0, strlen($url)-1);
	}
	return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $ret;
}
 
function _make_web_ftp_clickable_cb($matches) {
	$ret = '';
	$dest = $matches[2];
	$dest = 'http://' . $dest;
 
	if ( empty($dest) )
		return $matches[0];
	// removed trailing [,;:] from URL
	if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) {
		$ret = substr($dest, -1);
		$dest = substr($dest, 0, strlen($dest)-1);
	}
	return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>" . $ret;
}
 
function _make_email_clickable_cb($matches) {
	$email = $matches[2] . '@' . $matches[3];
	return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
}
 
function make_clickable($ret) {
	$ret = ' ' . $ret;
	// in testing, using arrays here was found to be faster
	$ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_url_clickable_cb', $ret);
	$ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_web_ftp_clickable_cb', $ret);
	$ret = preg_replace_callback('#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret);
 
	// this one is not in an array because we need it to run last, for cleanup of accidental links within links
	$ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret);
	$ret = trim($ret);
	return $ret;
}

Source: http://zenverse.net/php-function-to-auto-convert-url-into-hyperlink/

Create Data URI’s

Data URI’s can be useful for embedding images into HTML/CSS/JS to save on HTTP requests. The following function will create a Data URI based on $file for easier embedding.

function data_uri($file, $mime) {
  $contents=file_get_contents($file);
  $base64=base64_encode($contents);
  echo "data:$mime;base64,$base64";
}

Source: http://css-tricks.com/snippets/php/create-data-uris/

Download & save a remote image on your server

Downloading an image on a remote server and saving it on your own server is useful when building websites, and it’s also very easy to do. The two lines of code below will do it for you.

$image = file_get_contents('http://www.url.com/image.jpg');
file_put_contents('/images/image.jpg', $image); //Where to save the image

Source: http://www.catswhocode.com/blog/snippets/download-save-a-remote…

Remove Microsoft Word HTML tags

When used, Microsoft Word creates lots of tags: font, span, style, class… These tags are useful inside Word itself, but when you paste a text from Word into a webpage, you’ll end up with lots of useless tags. Here’s a very handy function to remove all Word HTML tags.

function cleanHTML($html) {
/// <summary>
/// Removes all FONT and SPAN tags, and all Class and Style attributes.
/// Designed to get rid of non-standard Microsoft Word HTML tags.
/// </summary>
// start by completely removing all unwanted tags

$html = ereg_replace("<(/)?(font|span|del|ins)[^>]*>","",$html);

// then run another pass over the html (twice), removing unwanted attributes

$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<\1>",$html);
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<\1>",$html);

return $html
}

Source: http://tim.mackey.ie/CommentView,guid,2ece42de-a334-4fd0-8f94-53c6602d5718.aspx

Detect browser language

If your website is multilingual, it can be useful to detect the browser language to use this language as the default. The code below will return the language used by the client’s browser.

function get_client_language($availableLanguages, $default='en'){
	if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
		$langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);

		foreach ($langs as $value){
			$choice=substr($value,0,2);
			if(in_array($choice, $availableLanguages)){
				return $choice;
			}
		}
	} 
	return $default;
}

Source: http://snipplr.com/view/12631/detect-browser-language/

Display number of Facebook fans in full text

If you have a Facebook page for your website or blog, you might want to display how many fans you have. This snippet will help you to get your Facebook fan count, in full text. Don’t forget to add your page ID on line 2.

<?php
	$page_id = "YOUR PAGE-ID";
	$xml = @simplexml_load_file("http://api.facebook.com/restserver.php?method=facebook.fql.query&query=SELECT%20fan_count%20FROM%20page%20WHERE%20page_id=".$page_id."") or die ("a lot");
	$fans = $xml->page->fan_count;
	echo $fans;
?>

Source: http://www.wprecipes.com/display-number-of-facebook-fans-in-full-text-on-your-wordpress-blog

  • sebastian

    ereg_replace, really? :-/
    you can’t post snippets with ereg functions ;)

    kr
    sebastian

    • Ciprian Flow

      Well it’s not that hard to replace it with preg_replace, useful snippets. Thanks.

  • http://www.technologyvenue.com/ Arbaz K

    Thanks for sharing the snippets with us.
    I was literally in need of the first snippet. Now I will know if my emails are being read or not.
    Thanks a lot :)

  • http://www.eyecreamhq.com Jamie

    I really like the number one, “find out if your email has been read”.

  • http://www.natebal.com/blog/ Nate Balcom

    Thanks so much for sharing. I’ll be using the extract keywords from your page script as soon as I’m done posting. Don’t you just love php?

  • http://www.letstalkweb.com.au Deepak Sachdeva

    Thanks for sharing these, I’m sure that the snippet for removing Microsoft Word HTML tags and the one for showing the number of Facebook fans will come in handy!