9 classic PHP code snippets to share, _PHP tutorial

9 classic PHP code snippets to share,

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 other party. Here’s a very interesting snippet of code that displays the actual date and time the record was read by the other party’s IP address.

Copy code The code is as follows:

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 . ' ' . $browser . ' ' . "rn";
fwrite($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

A great code snippet to easily extract keywords from web pages.

Copy code The code is as follows:

$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

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

Copy code The code 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.'
';
}

4. Automatically convert URL and jump to hyperlink

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

Copy code The code is as follows:

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;
}

五、创建数据URL

　　数据URL可以直接嵌入到HTML/CSS/JS中，以节省大量的 HTTP请求。 下面的这段代码可利用$file轻松创建数据URL。

复制代码 代码如下:

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

六、从服务器上下载&保存一个远程图片

　　当你在搭建网站时，从远程服务器下载某张图片并且将其保存在自己的服务器上，这一操作会经常用到。代码如下：

复制代码 代码如下:

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

七、移除Remove Microsoft Word HTML Tag

　　当你使用Microsoft Word会创建许多Tag，比如font，span，style，class等。这些标签对于Word本身而言是非常有用的，但是当你从Word粘贴至网页时，你会发现很多无用的Tag。因此，下面的这段代码可帮助你删除所有无用的Word HTML Tag。

复制代码 代码如下:

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
}
[code]

8. Detect browser language
If your website has multiple languages, 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.

[code]
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 you have an internally linked Facebook page on your website or blog, 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 on the second line of your page ID.

Copy code The code is as follows:

$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;
?>

The above 9 super practical and classic PHP codes are very easy to use. Friends can use them as a reference and use them in their own projects with slight modifications.

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