PHP编程常用于网站开发，往往在开发过程中要用到一些有关PHp的代码小片段，大家一定要收藏好了，今天在此分享几个非常有用的代码片段，大家一定要收好了。

1、 根据IP查找地址

function detect_city($ip) {

  $default = 'UNKNOWN';

  if (!is_string($ip) || strlen($ip) < 1 || $ip == '127.0.0.1' || $ip == 'localhost')

   $ip = '8.8.8.8';

  $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';

  $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);

  $ch = curl_init();

   $curl_opt = array(

   CURLOPT_FOLLOWLOCATION => 1,

   CURLOPT_HEADER  => 0,

   CURLOPT_RETURNTRANSFER => 1,

   CURLOPT_USERAGENT => $curlopt_useragent,

   CURLOPT_URL  => $url,

   CURLOPT_TIMEOUT   => 1,

   CURLOPT_REFERER   => 'http://' . $_SERVER['HTTP_HOST'],

  );

   curl_setopt_array($ch, $curl_opt);

   $content = curl_exec($ch);

   if (!is_null($curl_info)) {

   $curl_info = curl_getinfo($ch);

  }

   curl_close($ch);

   if ( preg_match('{<li>City : ([^<]*)</li>}i', $content, $regs) ) {

   $city = $regs[1];

  }

  if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) ) {

   $state = $regs[1];

  }

   if( $city!='' && $state!='' ){

   $location = $city . ', ' . $state;

   return $location;

  }else{

   return $default;

  }

  }

2、发送短信

调用 TextMagic API。

// Include the TextMagic PHP lib

require('textmagic-sms-api-php/TextMagicAPI.php');

// Set the username and password information

$username = 'myusername';

$password = 'mypassword';

// Create a new instance of TM

$router = new TextMagicAPI(array(

 'username' => $username,

 'password' => $password

));

// Send a text message to '999-123-4567'

$result = $router->send('Wake up!', array(9991234567), true);

// result: Result is: Array ( [messages] => Array ( [19896128] => 9991234567 ) [sent_text] => Wake up! [parts_count] => 1 )

3、显示网页的源代码

<?php // display source code 

$lines = file('http://google.com/'); 

foreach ($lines as $line_num => $line) { 

    // loop thru each line and prepend line numbers 

    echo "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n"; 

}

4、检查服务器是否使用HTTPS

if ($_SERVER['HTTPS'] != "on") {

 echo "This is not HTTPS";

}else{

 echo "This is HTTPS";

}

5、显示Facebook粉丝数量

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;

}

6、检测图片的主要颜色

$i = imagecreatefromjpeg("image.jpg");

for ($x=0;$x<imagesx($i);$x++) {

 for ($y=0;$y<imagesy($i);$y++) {

  $rgb = imagecolorat($i,$x,$y);

  $r = ($rgb >> 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);

7、获取内存使用信息

echo "Initial: ".memory_get_usage()." bytes \n";

/* prints

Initial: 361400 bytes

*/

// let's use up some memory

for ($i = 0; $i < 100000; $i++) {

 $array []= md5($i);

}

// let's remove half of the array

for ($i = 0; $i < 100000; $i++) {

 unset($array[$i]);

}

echo "Final: ".memory_get_usage()." bytes \n";

/* prints

Final: 885912 bytes

*/

 echo "Peak: ".memory_get_peak_usage()." bytes \n";

/* prints

Peak: 13687072 bytes

*/

8、使用 gzcompress() 压缩数据

$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);

9、使用PHP做Whois检查

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;

}

10、通过Email发送PHP错误

<?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>";

$email .= "<pre>" . print_r($vars, 1) . "</pre>";

$headers = 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

// Email the error to someone...

 error_log($email, 1, 'you@youremail.com', $headers);

// Make sure that you decide how to respond to errors (on the user's side)

 // Either echo an error message, or kill the entire project. Up to you...

 // The code below ensures that we only "die" if the error was more than

 // just a NOTICE.

 if ( ($number !== E_NOTICE) && ($number < 2048) ) {

  die("There was an error. Please try again later.");

 }

}

// We should use our custom function to handle errors.

set_error_handler('nettuts_error_handler');

// Trigger an error... (var doesn't exist)

echo $somevarthatdoesnotexist;

以上是小编汇总的十个非常用到的PHP代码片段，大家一定要收藏好了！