When you send an email, you may want to know whether the email has been read by the other party. Here’s a very interesting snippet of code that displays the actual date and time the record was read by the other party’s IP address.
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<?
error_reporting(0);
Header("Content-Type: image/jpeg");
//Get IP
if (!empty($_SERVER['HTTP_CLIENT_IP']))
{
$ip=$_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
{
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
}
else
{
$ip=$_SERVER['REMOTE_ADDR'];
}
//Time<code class="php comments">//Time
$actual_time<code class="php variable">$actual_time = time();<code class="php plain">= time();
$actual_day<code class="php variable">$actual_day = <code class="php plain">= date<code class="php functions">date(<code class="php plain">('Y.m.d'<code class="php string">'Y.m.d', <code class="php plain">, $actual_time<code class="php variable">$actual_time);<code class="php plain">);
$actual_day_chart<code class="php variable">$actual_day_chart = <code class="php plain">= date<code class="php functions">date(<code class="php plain">('d/m/y'<code class="php string">'d/m/y', <code class="php plain">, $actual_time<code class="php variable">$actual_time);<code class="php plain">);
$actual_hour<code class="php variable">$actual_hour = <code class="php plain">= date<code class="php functions">date(<code class="php plain">('H:i:s'<code class="php string">'H:i:s', <code class="php plain">, $actual_time<code class="php variable">$actual_time);<code class="php plain">);
//GET Browser<code class="php comments">//GET Browser
$browser<code class="php variable">$browser = <code class="php plain">= $_SERVER<code class="php variable">$_SERVER[<code class="php plain">['HTTP_USER_AGENT'<code class="php string">'HTTP_USER_AGENT'];<code class="php plain">];
<code class="php spaces">
//LOG<code class="php comments">//LOG
$myFile<code class="php variable">$myFile = <code class="php plain">= "log.txt"<code class="php string">"log.txt";<code class="php plain">;
$fh<code class="php variable">$fh = <code class="php plain">= fopen<code class="php functions">fopen(<code class="php plain">($myFile<code class="php variable">$myFile, <code class="php plain">, 'a+'<code class="php string">'a+');<code class="php plain">);
$stringData<code class="php variable">$stringData = <code class="php plain">= $actual_day<code class="php variable">$actual_day . <code class="php plain">. ' '<code class="php string">' ' . <code class="php plain">. $actual_hour<code class="php variable">$actual_hour . <code class="php plain">. ' '<code class="php string">' ' . <code class="php plain">. $ip<code class="php variable">$ip . <code class="php plain">. ' '<code class="php string">' ' . <code class="php plain">. $browser<code class="php variable">$browser . <code class="php plain">. ' '<code class="php string">' ' . <code class="php plain">. "rn"<code class="php string">"rn";<code class="php plain">;
fwrite(<code class="php plain">fwrite($fh<code class="php variable">$fh, <code class="php plain">, $stringData<code class="php variable">$stringData);<code class="php plain">);
fclose(<code class="php plain">fclose($fh<code class="php variable">$fh);<code class="php plain">);
//Generate Image (Es. dimesion is 1x1)<code class="php comments">//Generate Image (Es. dimesion is 1x1)
$newimage<code class="php variable">$newimage = ImageCreate(1,1);<code class="php plain">= ImageCreate(1,1);
$grigio<code class="php variable">$grigio = ImageColorAllocate(<code class="php plain">= ImageColorAllocate($newimage<code class="php variable">$newimage,255,255,255);<code class="php plain">,255,255,255);
ImageJPEG(<code class="php plain">ImageJPEG($newimage<code class="php variable">$newimage);<code class="php plain">);
ImageDestroy(<code class="php plain">ImageDestroy($newimage<code class="php variable">$newimage);<code class="php plain">);
<code class="php spaces">
?><code class="php plain">?>
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Source code
A great code snippet to easily extract keywords from web pages.
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$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( $keywords );
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Source code
Using DOM, you can easily grab links from any page. The code example is as follows:
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$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 $url.'<br />';
}
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Source code
In WordPress, if you want to automatically convert the URL and jump to the hyperlinked page, you can use the built-in function make_clickable() to perform this operation. If you want to operate the program outside of WordPress, then you can refer to the wp-includes/formatting.php source code.
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function _make_url_clickable_cb($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>" . $ret;
}
<code class="php spaces">
function<code class="php keyword">function _make_web_ftp_clickable_cb(_make_web_ftp_clickable_cb($matches$matches<code class="php plain">) { ) {$ret
<code class="php plain">= $ret<code class="php string">'' ;= ''<code class="php variable">$dest= ;$matches
<code class="php plain">[2];$dest<code class="php spaces"> $dest= <code class="php plain">= $matches<code class="php string">'http://'. [2];$dest
<code class="php plain">;$dest<code class="php spaces"> = if'http://'<code class="php plain">( empty. ($dest<code class="php variable">$dest) );
<code class="php keyword">return
<code class="php variable">$matchesif<code class="php plain">[0]; ( // removed trailing [,;:] from URLempty<code class="php spaces"> if(<code class="php plain">( in_array($dest<code class="php functions">substr() )$dest
<code class="php plain">, -1), return<code class="php keyword">array $matches<code class="php plain">('.'[0];,
<code class="php string">','// removed trailing [,;:] from URL<code class="php plain">,
<code class="php string">';'if<code class="php plain">, ':'( in_array()) === true ) {substr<code class="php spaces"> $ret(= $dest<code class="php functions">substr(, -1), $destarray<code class="php plain">, -1); ($dest'.'<code class="php plain">= substr, (','<code class="php variable">$dest, 0, , strlen';'<code class="php plain">($dest, )-1);':'<code class="php spaces"> })) === true ) {
<code class="php keyword">return$ret<code class="php variable">$matches [1] . = "<a href="$dest" rel="nofollow">$dest</a>"substr<code class="php plain">. $ret(;$dest<code class="php plain">} , -1);function
<code class="php plain">_make_email_clickable_cb($dest<code class="php variable">$matches ) {= substr<code class="php variable">$email= ($matches$dest<code class="php plain">[2] . '@', 0, . strlen<code class="php variable">$matches[3];( $dest<code class="php keyword">return$matches)-1);[1] .
<code class="php string">"<a href="mailto:$email">$email</a>";}
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源码
数据URL可以直接嵌入到HTML/CSS/JS中，以节省大量的 HTTP请求。 下面的这段代码可利用$file轻松创建数据URL。
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function
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![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
