超級實用的9個PHP代碼片段
在開發網站、app或部落格時，代碼片段可以真正地為你節省時間。今天，讓我們一起來分享小編收集整理好的這些超級有用的PHP代碼片段。一起來看一看吧!
1.建立資料URI
資料URI在嵌入圖像到HTML / CSS / JS中以節省HTTP請求時非常有用，并且可以減少網站的加載時間。下面的函數可以建立基于$file的資料URI。
function data_uri($file, $mime) {
$contents=file_get_contents($file);
$base64=base64_encode($contents);
echo "data:$mime;base64,$base64";
}
2.合并JavaScript和CSS檔案
另一個可以盡量減少HTTP請求和節省頁面加載時間的好建議是：合并你的CSS和JS檔案。雖然我更建議大家使用專用插件(例如minify)，但使用PHP來合并檔案也非常容易。我們來看一下：
function combine_my_files($array_files, $destination_dir, $dest_file_name){
if(!is_file($destination_dir . $dest_file_name)){ //continue only if file doesn't exist
$content = "";
foreach ($array_files as $file){ //loop through array list
$content .= file_get_contents($file); //read each file
}
//You can use some sort of minifier here
//minify_my_js($content);
$new_file = fopen($destination_dir . $dest_file_name, "w" ); //open file for writing
fwrite($new_file , $content); //write to destination
fclose($new_file);
return ''; //output combined file
}else{
//use stored file
return ''; //output combine file
}
}
并且，用法是這樣的：
$files = array(
'http://example/files/sample_js_file_1.js',
'http://example/files/sample_js_file_2.js',
'http://example/files/beautyquote_functions.js',
'http://example/files/crop.js',
'http://example/files/jquery.autosize.min.js',
);
echo combine_my_files($files, 'minified_files/', md5("my_mini_file").".js");
3.檢視你的電子郵件是否已讀
當發送電子郵件時，你會希望知道你的郵件是否已讀。這裡有一個非常有趣的代碼片段，它可以記錄閱讀你郵件的IP位址，以及實際的日期和時間。
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 . ' ' . $browser . ' ' . " ";
fwrite($fh, $stringData);
fclose($fh);
//Generate Image (Es. dimesion is 1x1)
$newimage = ImageCreate(1,1);
$grigio = ImageColorAllocate($newimage,255,255,255);
ImageJPEG($newimage);
ImageDestroy($newimage);
?>
4.從網頁提取關鍵詞
正如這小标題所說的那樣：這個代碼片段能讓你輕易地從網頁中提取元關鍵詞。
$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 );
5.查找頁面上的所有連結
使用DOM，你可以輕松地抓取來網頁上的所有連結。這裡有一個工作示例：
$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 $url.'
';
}
6.自動轉換URL為可點選的超連結
在WordPress中，如果你想在字元串中自動轉換所有的URL成可點選的超連結，那麼使用内置函數make_clickable()可以讓你心想事成。如果你需要在WordPress之外這麼做，那麼你可以在wp-includes/formatting.php參考該函數的源代碼：
function _make_url_clickable_cb($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
$ret = preg_replace_callback('#([s>])([w]+?://[wx80-xff#$%&~/.-;:=,[email protected][]+]*)#is', '_make_url_clickable_cb', $ret);
$ret = preg_replace_callback('#([s>])((www|ftp).[wx80-xff#$%&~/.-;:=,[email protected][]+]*)#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;
}