php实用代码片段整理

$meta = get_meta_tags('http://www.vevb.com/');$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 );

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

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

$image = file_get_contents('http://www.php100.com/image.jpg');file_put_contents('/images/image.jpg', $image); //Where to save the image

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}

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;}

//如果去获取某个excel日期（格式为：2016-03-12），那么获取到的是数字，需要经过转换才能恢复public function excelTime($date, $time = false) {  if(function_exists('GregorianToJD')){    if (is_numeric( $date )) {    $jd = GregorianToJD( 1, 1, 1970 );    $gregorian = JDToGregorian( $jd + intval ( $date ) - 25569 );    $date = explode( '/', $gregorian );    $date_str = str_pad( $date [2], 4, '0', STR_PAD_LEFT )    ."-". str_pad( $date [0], 2, '0', STR_PAD_LEFT )    ."-". str_pad( $date [1], 2, '0', STR_PAD_LEFT )    . ($time ? " 00:00:00" : '');    return $date_str;    }  }else{    // $date=$date>25568? $date+1:25569;    /*There was a bug if Converting date before 1-1-1970 (tstamp 0)*/    $ofs=(70 * 365 + 17+2) * 86400;    $date = date("Y-m-d",($date * 86400) - $ofs).($time ? " 00:00:00" : '');    return $date;  }}

$json = '[{"id":"22","name":"33","descn":"44"}]'; //json格式的数组转换成 php的数组$arr = (Array)json_decode($json);echo $arr[0]->id; //用对象的方式访问（这种是没有转换成数组，而是转换成对象的情况

$json_arr = array('WebName'=>'11','WebSite'=>'11');$php_json = json_encode($json_arr); //把php数组格式转换成 json 格式的数据echo $php_json;