《PHP教程：9個實用的PHP代碼片段分享》要點：
本文介紹了PHP教程：9個實用的PHP代碼片段分享，希望對您有用。如果有疑問，可以聯系我們。
一．查看郵件是否已被閱讀
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當你發送郵件時,你肯定很想知道你的郵件是否已被對方查看.下面的代碼就能實現記錄閱讀你郵件的IP地址,還有實際的閱讀日期和時間.
PHP實戰
代碼如下:
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);
?>
源代碼：http://www.emoticode.net/php/code-to-find-out-if-your-email-has-been-read.html
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二．從網頁中提取關鍵詞
這段優秀的代碼可以簡單地實現從網頁中提取關鍵詞的功能.
PHP實戰
代碼如下:
$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 );
源代碼：http://www.emoticode.net/php/extract-keywords-from-any-webpage.html
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三．查找頁面上的所有鏈接
使用DOM,你可以在任意頁面上抓取鏈接,示例如下.
PHP實戰
代碼如下:
$html = file_get_contents('http://www.php100.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 $url.'';
}
源代碼：http://snipplr.com/view/70489/find-all-links-on-a-page/
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四．自動轉換URL為可點擊超鏈接
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在Wordpress中,如果你想自動轉換所有的URLs為可點擊超鏈接,你就可以使用內置函數make_clickable()實現.當你在WordPress外操作時,你可以參考wp-includes/formatting.php中的源代碼.
代碼如下:
function _make_url_clickable_cb($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 $ret;
}
源代碼：http://zenverse.net/php-function-to-auto-convert-url-into-hyperlink/
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?五．創建數據URI
數據URI可以幫助將圖像嵌入到HTML/CSS/JS中,從而節省HTTP哀求.下面的函數可以利用$file創建數據URI.
PHP實戰
代碼如下:
function data_uri($file, $mime) {
??? $contents=file_get_contents($file);
??? $base64=base64_encode($contents);
??? echo $base64";
}
源代碼：http://css-tricks.com/snippets/php/create-data-uris/
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六．下載和保存遠程圖片到你的服務器
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當你在搭建網站時,很可能會從遠程服務器上下載圖片保存到你自己的服務器上,下面的代碼就可以贊助你實現這個功能.
代碼如下:
$image = file_get_contents('http://www.php100.com/image.jpg');
file_put_contents('/images/image.jpg', $image);?? //Where to save the image
源代碼：http://www.catswhocode.com/blog/snippets/download-save-a-remote-image-on-your-server-using-php
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七．移除Microsoft Word HTML標簽
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當你使用Microsoft Word時,會創建很多標簽tag,比如font、span、style、class等,這些標簽在Word中十分有用,但當你從Word中把文本粘貼到網頁上,就會出現很多沒用的標簽.下面實用的函數可以贊助你清除所有的Word HTML標簽.
代碼如下:
function cleanHTML($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 $html
}
源代碼：http://tim.mackey.ie/CommentView,guid,2ece42de-a334-4fd0-8f94-53c6602d5718.aspx
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八．檢測瀏覽器語言
如果你的網站是多種語言的,下面的代碼可以贊助你檢測瀏覽器語言,它會返回客戶端瀏覽器的默認語言.
PHP實戰
代碼如下:
function get_client_language($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;
}
源代碼：http://snipplr.com/view/12631/detect-browser-language/
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九．顯示Facebook上的粉絲數量
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如果在你的網站或博客中,鏈有Facebook頁面,你可能希望顯示Facebook上的粉絲數量,下面的代碼就可以贊助你獲取粉絲數量,另外不要忘記在代碼第二行添加你的頁面ID.
代碼如下:
???
$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;
?>
源代碼：http://www.wprecipes.com/display-number-of-facebook-fans-in-full-text-on-your-wordpress-blog
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