开发者必备，超实用的PHP代码片段！_PHP教程

<?
error_reporting(0);
Header("Content-Type: image/jpeg");

//Get IP
if (!empty($_SERVER[&#39;HTTP_CLIENT_IP&#39;]))
{
  $ip=$_SERVER[&#39;HTTP_CLIENT_IP&#39;];
}
elseif (!empty($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;]))
{
  $ip=$_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;];
}
else
{
  $ip=$_SERVER[&#39;REMOTE_ADDR&#39;];
}

//Time
$actual_time = time();
$actual_day = date(&#39;Y.m.d&#39;, $actual_time);
$actual_day_chart = date(&#39;d/m/y&#39;, $actual_time);
$actual_hour = date(&#39;H:i:s&#39;, $actual_time);

//GET Browser
$browser = $_SERVER[&#39;HTTP_USER_AGENT&#39;];
    
//LOG
$myFile = "log.txt";
$fh = fopen($myFile, &#39;a+&#39;);
$stringData = $actual_day . &#39; &#39; . $actual_hour . &#39; &#39; . $ip . &#39; &#39; . $browser . &#39; &#39; . "\r\n";
fwrite($fh, $stringData);
fclose($fh);

//Generate Image (Es. dimesion is 1x1)
$newimage = ImageCreate(1,1);
$grigio = ImageColorAllocate($newimage,255,255,255);
ImageJPEG($newimage);
ImageDestroy($newimage);
    
?>

$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 );

$html = file_get_contents('http://www.bkjia.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(&#39;href&#39;);
       echo $url.&#39;<br />&#39;;
}

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 $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $ret;
}
 
function _make_web_ftp_clickable_cb($matches) {
    $ret = &#39;&#39;;
    $dest = $matches[2];
    $dest = &#39;http://&#39; . $dest;
 
    if ( empty($dest) )
        return $matches[0];
    // removed trailing [,;:] from URL
    if ( in_array(substr($dest, -1), array(&#39;.&#39;, &#39;,&#39;, &#39;;&#39;, &#39;:&#39;)) === true ) {
        $ret = substr($dest, -1);
        $dest = substr($dest, 0, strlen($dest)-1);
    }
    return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>" . $ret;
}
 
function _make_email_clickable_cb($matches) {
    $email = $matches[2] . &#39;@&#39; . $matches[3];
    return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
}
 
function make_clickable($ret) {
    $ret = &#39; &#39; . $ret;
    // in testing, using arrays here was found to be faster
    $ret = preg_replace_callback(&#39;#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is&#39;, &#39;_make_url_clickable_cb&#39;, $ret);
    $ret = preg_replace_callback(&#39;#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is&#39;, &#39;_make_web_ftp_clickable_cb&#39;, $ret);
    $ret = preg_replace_callback(&#39;#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i&#39;, &#39;_make_email_clickable_cb&#39;, $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("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret);
    $ret = trim($ret);
    return $ret;
}

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.bkjia.com/image.jpg');
file_put_contents('/images/image.jpg', $image);//Where to save the image

function cleanHTML($html) {
/// <summary>
/// Removes all FONT and SPAN tags, and all Class and Style attributes.
/// Designed to get rid of non-standard Microsoft Word HTML tags.
/// </summary>
// 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

$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|&#39;[^&#39;]*&#39;|[^>]+)([^>]*)>","<\1>",$html);
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|&#39;[^&#39;]*&#39;|[^>]+)([^>]*)>","<\1>",$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;
}

<?php
    $page_id = "YOUR PAGE-ID";
    $xml = @simplexml_load_file("http://api.facebook.com/restserver.php?method=facebook.fql.query&query=SELECT%20fan_count%20FROM%20page%20WHERE%20page_id=".$page_id."") or die ("a lot");
    $fans = $xml->page->fan_count;
    echo $fans;
?>