9 More useful PHP code snippets, _php tutorial

9 more useful snippets of PHP code,

More useful PHP code snippets, share to everyone for your reference, the specific code is as follows

First, extract the keywords from the Web page

$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 ($k Eywords);p Rint_r ($keywords);

Second, find all links on the page
Using the DOM, you can crawl links on any page, such as below.

$html = file_get_contents (' http://www.example.com '); $dom = new DOMDocument (); @ $dom->loadhtml ($html); Grab all 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 .'
';}

Third, create the data URI
Data URIs can help embed images into HTML/CSS/JS, saving HTTP requests. The following function can create a data URI using $file.

function Data_uri ($file, $mime) {  $contents =file_get_contents ($file);  $base 64=base64_encode ($contents);  echo "Data: $mime; base64, $base 64";}

Iv. downloading and saving remote images to your server

When you are building a website, you are likely to download images from a remote server to your own server, and the following code will help you implement this feature.

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

V. Remove Microsoft Word HTML tags
When you use Microsoft Word, you create many tag tags, such as font, span, style, class, and so on, that are useful in word, but when you paste text from Word onto a Web page, there are many useless tags. The following useful functions can help you clear all the word HTML tags.

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 ("&L t; (/)? (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}

Vi. Detection of Browser language
If your site is multilingual, the following code can help you detect the browser language, which returns to the default language of the client browser.

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;}

Seven, save the request information to the local
Copy the Code code as follows: File_put_contents ('/tmp/all.log ', ' mapping '. Date ("M-d h:i:s"). " \ n ", file_append);
Eight, Excel convert dates to each other

If you go to get an Excel date (in the format: 2016-03-12), then you get a number that needs to be converted to restore 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 = (* 365 + 17+2) * 86400;        $date = Date ("Y-m-d", ($date * 86400)-$ofs). ($time? "00:00:00": ");        return $date;      }  }

Nine, JSON and data conversion

1 JSON conversion to an array of $json = ' [{' id ': ' "," "Name": "", "DESCN": "44"}] '; The JSON-formatted array is converted to an array of PHP $arr = (array) json_decode ($json); Echo $arr [0]->id; Accessed as an object (this is the case of converting an array to an object

The 2 array is converted to Json$json_arr = Array (' WebName ' = ' = ' one ', ' WebSite ' = ' one '); $php _json = Json_encode ($json _arr); Convert PHP array format to JSON-formatted data echo $php _json;

The above is the whole content of this article, I hope that everyone's study has helped.

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