9 code recommendations for practical functions of PHP

1. Check to see if your message has been read

When you send an email, you may want to know whether the email has been read by the other party. Here's a very interesting snippet of code that shows the actual date and time each other's IP address record was read.

<?

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);

     

?>

2. Extract keywords from Web pages

1 Great code snippet can easily extract keywords from web pages.

$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 );

3. Find all links on the page

With DOM, you can easily grab links from any page. The code example is as follows:

$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 />';

}

4. Automatically convert URL and jump to hyperlink

In WordPress, if you want to automatically convert URL to a hyperlink page, you can do so using the built-in function make_clickable (). If you want to operate this program outside of WordPress, you can refer to the source code of 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;

}

5. Create data URL

Data URL can be embedded directly into HTML/CSS/JS to save a lot of HTTP requests. The following code can easily create data URL with $file.

function data_uri($file, $mime) {

  $contents=file_get_contents($file);

  $base64=base64_encode($contents);

  echo "data:$mime;base64,$base64";

}

6. Download from the server & Save 1 remote picture

When you are building a website, download a picture from a remote server and save it on your own server, which is often used. The code is as follows:

$image = file_get_contents('http://www.url.com/image.jpg');

file_put_contents('/images/image.jpg', $image); //Where to save the image

7. Remove Remove Microsoft Word HTML Tag

When you use Microsoft, Word will create many Tag, such as font, span, style, class and so on. These tags are very useful for Word itself, but when you paste from Word to a web page, you will find many useless Tag. Therefore, the following code can help you delete all useless Word HTML Tag.

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

}

8. Detect browser language

If you have more than one language on your site, you can use this code as the default language to detect the browser language. This code will return the initial language used by the browser client.

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;

}

9. Display the number of Facebook fans

If your website or blog has an inline Facebook page, you may want to know how many followers you have. This code will help you check the number of Facebook followers. Remember, don't forget to add this code to line 2 of your page ID.

<?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;

?>