Home Backend Development PHP Tutorial 9 more practical php code snippets_php skills

9 more practical php code snippets_php skills

May 16, 2016 pm 07:56 PM
php

比较有用的php代码片段,分享给大家供大家参考,具体代码如下

一、从网页中提取关键词

$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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二、查找页面上的所有链接
使用DOM,你可以在任意页面上抓取链接,示例如下。

$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 $url.'<br />';
}
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三、创建数据URI
数据URI可以帮助将图像嵌入到HTML/CSS/JS中,从而节省HTTP请求。下面的函数可以利用$file创建数据URI。

function data_uri($file, $mime) {
  $contents=file_get_contents($file);
  $base64=base64_encode($contents);
  echo "data:$mime;base64,$base64";
}
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四、下载和保存远程图片到你的服务器

当你在搭建网站时,很可能会从远程服务器上下载图片保存到你自己的服务器上,下面的代码就可以帮助你实现这个功能。

$image = file_get_contents('http://www.php100.com/image.jpg');
file_put_contents('/images/image.jpg', $image);  //Where to save the image
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五、移除Microsoft Word HTML标签
当你使用Microsoft Word时,会创建很多标签tag,比如font、span、style、class等,这些标签在Word中十分有用,但当你从Word中把文本粘贴到网页上,就会出现很多没用的标签。下面实用的函数可以帮助你清除所有的Word HTML标签。

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

$html = ereg_replace("<(/)&#63;(font|span|del|ins)[^>]*>","",$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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六、检测浏览器语言
如果你的网站是多种语言的,下面的代码可以帮助你检测浏览器语言,它会返回客户端浏览器的默认语言。

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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七、保存请求信息到本地

复制代码 代码如下:
file_put_contents('/tmp/all.log','mapping'.date("m-d H:i:s")."\n",FILE_APPEND);

八、excel相互转换日期

//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 &#63; " 00:00:00" : '');

        return $date_str;
        }

      }else{

        // $date=$date>25568&#63; $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 &#63; " 00:00:00" : '');
        return $date;
      }

  }
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九、json与数据相互转换

1 json转换成数组
$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
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2 数组转换成json
$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;
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以上就是本文的全部内容,希望对大家的学习有所帮助。

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