推荐10个十分实用的PHP代码片段

<?php // display source code    $lines = file(&#39;http://google.com/&#39;);    foreach ($lines as $line_num => $line) {        // loop thru each line and prepend line numbers        echo "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n";    }   ?>

if ($_SERVER['HTTPS'] != "on") {        echo "This is not HTTPS";    }else{        echo "This is HTTPS";    }    

function fb_fan_count($facebook_name){        // Example: https://graph.facebook.com/digimantra        $data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));        echo $data->likes;    }       

$i = imagecreatefromjpeg("image.jpg");        for ($x=0;$x<imagesx for imagecolorat>> 16) & 0xFF;            $g   = ($rgb >>  & 0xFF;            $b   = $rgb & 0xFF;                $rTotal += $r;            $gTotal += $g;            $bTotal += $b;            $total++;        }    }        $rAverage = round($rTotal/$total);    $gAverage = round($gTotal/$total);    $bAverage = round($bTotal/$total);    </imagesx>

echo "Initial: ".memory_get_usage()." bytes \n";    /* prints   Initial: 361400 bytes   */        // let's use up some memory    for ($i = 0; $i <br><br><br><span style="color:#3366ff"><strong>8.  使用gzcompress()压缩数据</strong></span><br>当使用很长的string时，可以通过gzcompress()方法，将strings压缩。解压缩使用gzuncompress()即可。代码如下。<br><pre code_snippet_id="422676" snippet_file_name="blog_20140708_8_9159064" name="code" class="php">$string =    "Lorem ipsum dolor sit amet, consectetur    adipiscing elit. Nunc ut elit id mi ultricies    adipiscing. Nulla facilisi. Praesent pulvinar,    sapien vel feugiat vestibulum, nulla dui pretium orci,    non ultricies elit lacus quis ante. Lorem ipsum dolor    sit amet, consectetur adipiscing elit. Aliquam    pretium ullamcorper urna quis iaculis. Etiam ac massa    sed turpis tempor luctus. Curabitur sed nibh eu elit    mollis congue. Praesent ipsum diam, consectetur vitae    ornare a, aliquam a nunc. In id magna pellentesque    tellus posuere adipiscing. Sed non mi metus, at lacinia    augue. Sed magna nisi, ornare in mollis in, mollis    sed nunc. Etiam at justo in leo congue mollis.    Nullam in neque eget metus hendrerit scelerisque    eu non enim. Ut malesuada lacus eu nulla bibendum    id euismod urna sodales. ";        $compressed = gzcompress($string);        echo "Original size: ". strlen($string)."\n";    /* prints   Original size: 800   */        echo "Compressed size: ". strlen($compressed)."\n";    /* prints   Compressed size: 418   */        // getting it back    $original = gzuncompress($compressed); 

function whois_query($domain) {            // fix the domain name:        $domain = strtolower(trim($domain));        $domain = preg_replace('/^http:\/\//i', '', $domain);        $domain = preg_replace('/^www\./i', '', $domain);        $domain = explode('/', $domain);        $domain = trim($domain[0]);            // split the TLD from domain name        $_domain = explode('.', $domain);        $lst = count($_domain)-1;        $ext = $_domain[$lst];            // You find resources and lists        // like these on wikipedia:        //        // http://de.wikipedia.org/wiki/Whois        //        $servers = array(            "biz" => "whois.neulevel.biz",            "com" => "whois.internic.net",            "us" => "whois.nic.us",            "coop" => "whois.nic.coop",            "info" => "whois.nic.info",            "name" => "whois.nic.name",            "net" => "whois.internic.net",            "gov" => "whois.nic.gov",            "edu" => "whois.internic.net",            "mil" => "rs.internic.net",            "int" => "whois.iana.org",            "ac" => "whois.nic.ac",            "ae" => "whois.uaenic.ae",            "at" => "whois.ripe.net",            "au" => "whois.aunic.net",            "be" => "whois.dns.be",            "bg" => "whois.ripe.net",            "br" => "whois.registro.br",            "bz" => "whois.belizenic.bz",            "ca" => "whois.cira.ca",            "cc" => "whois.nic.cc",            "ch" => "whois.nic.ch",            "cl" => "whois.nic.cl",            "cn" => "whois.cnnic.net.cn",            "cz" => "whois.nic.cz",            "de" => "whois.nic.de",            "fr" => "whois.nic.fr",            "hu" => "whois.nic.hu",            "ie" => "whois.domainregistry.ie",            "il" => "whois.isoc.org.il",            "in" => "whois.ncst.ernet.in",            "ir" => "whois.nic.ir",            "mc" => "whois.ripe.net",            "to" => "whois.tonic.to",            "tv" => "whois.tv",            "ru" => "whois.ripn.net",            "org" => "whois.pir.org",            "aero" => "whois.information.aero",            "nl" => "whois.domain-registry.nl"        );            if (!isset($servers[$ext])){            die('Error: No matching nic server found!');        }            $nic_server = $servers[$ext];            $output = '';            // connect to whois server:        if ($conn = fsockopen ($nic_server, 43)) {            fputs($conn, $domain."\r\n");            while(!feof($conn)) {                $output .= fgets($conn,128);            }            fclose($conn);        }        else { die('Error: Could not connect to ' . $nic_server . '!'); }            return $output;    }  

<?php // Our custom error handler    function nettuts_error_handler($number, $message, $file, $line, $vars){        $email = "            <p>An error ($number) occurred on line            <strong>$line</strong> and in the <strong>file: $file.</strong>            <p> $message </p>";            $email .= "<pre class="brush:php;toolbar:false">" . print_r($vars, 1) . "