A must-have for developers and a practical PHP code snippet! _ PHP Tutorial

This is a must-have for developers. it is a very practical PHP code snippet !. Previously, the R & D channel published "use directly, 10 PHP code snippets", which was well received by netizens. In this article, I will continue to share nine extremely useful PHP code snippets. Before that, the R & D channel published "use directly, 10 PHP code snippets", which was well received by netizens. In this article, I will continue to share nine extremely useful PHP code snippets. When developing websites, applications, or blogs, you can use the code to save a lot of time.

1. check whether the email has been read

When you send an email, you may want to know whether the email has been read by the recipient. Here is a very interesting code snippet that shows the actual date and time when the recipient's IP address records are read.

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2. extract keywords from webpages

A great code snippet can easily extract keywords from webpages.

$meta = get_meta_tags('http://www.emoticode.net/');$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 );

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3. search for all links on the page

With DOM, you can easily capture links from any page. the sample code is as follows:

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

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4. automatically convert the URL and jump to the hyperlink

In WordPress, if you want to automatically convert the URL and jump to the hyperlink page, you can use the built-in function make_clickable () to perform this operation. If you want to operate this program outside of WordPress, you can refer to wp-nodes des/formatting. php source code.

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 $matches[1] . "$url" . $ret;} function _make_web_ftp_clickable_cb($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 $matches[1] . "$dest" . $ret;} function _make_email_clickable_cb($matches) {    $email = $matches[2] . '@' . $matches[3];    return $matches[1] . "$email";} 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("#(]+?>|>))]+?>([^>]+?)#i", "$1$3", $ret);    $ret = trim($ret);    return $ret;}

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5. create a data URL

Data URLs can be directly embedded into HTML, CSS, and JS to save a lot of HTTP requests. The following code allows you to easily create a data URL using $ file.

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

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6. download and save a remote image from the server

When you build a website, you can download an image from a remote server and save it on your own server. this operation is often used. The code is as follows:

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

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7. Remove the Remove Microsoft Word HTML Tag

When you use Microsoft Word, you will create many tags, such as font, span, style, and class. These tags are very useful for the Word itself, but when you paste the Word into a webpage, you will find a lot of useless tags. Therefore, the following code helps you delete all useless Word HTML tags.

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

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8. check the browser language

If your website has multiple languages, you can use this code as the default language to detect the browser language. This section of code returns 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;}

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9. display the number of Facebook fans

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

 page->fan_count;    echo $fans;?>

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From: Catswhocode

Bytes. In this article, I will continue to share nine extremely useful PHP code snippets. When...