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首页 / 网页编程 / PHP / 必须收藏的23个php实用代码片段

在编写代码的时候有个神奇的工具总是好的!下面这里收集了 40+ PHP 代码片段,可以帮助你开发 PHP 项目。
这些 PHP 片段对于 PHP 初学者也非常有帮助,非常容易学习,让我们开始学习吧~
1. 发送 SMS
在开发 Web 或者移动应用的时候,经常会遇到需要发送 SMS 给用户,或者因为登录原因,或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。
为了使用任何的语言发送 SMS,需要一个 SMS gateway。大部分的 SMS 会提供一个 API,这里是使用 MSG91 作为 SMS gateway。

function send_sms($mobile,$msg){$authKey = "XXXXXXXXXXX";date_default_timezone_set("Asia/Kolkata");$date = strftime("%Y-%m-%d %H:%M:%S");//Multiple mobiles numbers separated by comma$mobileNumber = $mobile;//Sender ID,While using route4 sender id should be 6 characters long.$senderId = "IKOONK";//Your message to send, Add URL encoding here.$message = urlencode($msg);//Define route$route = "template";//Prepare you post parameters$postData = array("authkey" => $authKey,"mobiles" => $mobileNumber,"message" => $message,"sender" => $senderId,"route" => $route);//API URL$url="https://control.msg91.com/sendhttp.php";// init the resource$ch = curl_init();curl_setopt_array($ch, array(CURLOPT_URL => $url,CURLOPT_RETURNTRANSFER => true,CURLOPT_POST => true,CURLOPT_POSTFIELDS => $postData//,CURLOPT_FOLLOWLOCATION => true));//Ignore SSL certificate verificationcurl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);//get response$output = curl_exec($ch);//Print error if anyif(curl_errno($ch)){echo "error:" . curl_error($ch);}curl_close($ch);}
其中“$authKey = "XXXXXXXXXXX";”需要你输入你的密码,“$senderId = "IKOONK";”需要你输入你的 SenderID。当输入移动号码的时候需要指定国家代码 (比如,美国是 1,印度是 91 )。
语法:

<?php$message = "Hello World";$mobile = "918112998787";send_sms($mobile,$message);?>
2. 使用 mandrill 发送邮件
Mandrill 是一款强大的 SMTP 提供器。开发者倾向于使用一个第三方 SMTP provider 来获取更好的收件交付。
下面的函数中,你需要把 “Mandrill.php” 放在同一个文件夹,作为 PHP 文件,这样就可以使用TA来发送邮件。

function send_email($to_email,$subject,$message1){require_once "Mandrill.php";$apikey = "XXXXXXXXXX"; //specify your api key here$mandrill = new Mandrill($apikey);$message = new stdClass();$message->html = $message1;$message->text = $message1;$message->subject = $subject;$message->from_email = "blog@koonk.com";//Sender Email$message->from_name = "KOONK";//Sender Name$message->to = array(array("email" => $to_email));$message->track_opens = true;$response = $mandrill->messages->send($message);}
$apikey = "XXXXXXXXXX"; //specify your api key here”这里需要你指定你的 API 密钥(从 Mandrill 账户中获得)。
语法:

<?php$to = "abc@example.com";$subject = "This is a test email";$message = "Hello World!";send_email($to,$subject,$message);?>
为了达到最好的效果,最好按照 Mandrill 的教程去配置 DNS。
3. PHP 函数:阻止 SQL 注入
SQL 注入或者 SQLi 常见的攻击网站的手段,使用下面的代码可以帮助你防止这些工具。

function clean($input){if (is_array($input)){foreach ($input as $key => $val) {$output[$key] = clean($val);// $output[$key] = $this->clean($val);}}else{$output = (string) $input;// if magic quotes is on then use strip slashesif (get_magic_quotes_gpc()){$output = stripslashes($output);}// $output = strip_tags($output);$output = htmlentities($output, ENT_QUOTES, "UTF-8");}// return the clean textreturn $output;}
语法:

<?php$text = "<script>alert(1)</script>";$text = clean($text);echo $text;?>
4. 检测用户位置
使用下面的函数,可以检测用户是在哪个城市访问你的网站

function detect_city($ip) {$default = "UNKNOWN";$curlopt_useragent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)";$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;}}
语法:

<?php$ip = $_SERVER["REMOTE_ADDR"];$city = detect_city($ip);echo $city;?>
5. 获取 Web 页面的源代码
使用下面的函数,可以获取任意 Web 页面的 HTML 代码

function display_sourcecode($url){$lines = file($url);$output = "";foreach ($lines as $line_num => $line) {// loop thru each line and prepend line numbers$output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "
";}}
语法:

<?php$url = "http://blog.koonk.com";$source = display_sourcecode($url);echo $source;?>
6. 计算喜欢你的 Facebook 页面的用户

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

<?php$page = "koonktechnologies";$count = fb_fan_count($page);echo $count;?>
7. 确定任意图片的主导颜色

function dominant_color($image){$i = imagecreatefromjpeg($image);for ($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);}
8. whois 查询
使用下面的函数可以获取任何域名用户的完整细节

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, $domain."
");while(!feof($conn)) {$output .= fgets($conn,128);}fclose($conn);}else { die("Error: Could not connect to " . $nic_server . "!"); } return $output;}
语法:

<?php$domain = "http://www.blog.koonk.com";$result = whois_query($domain);print_r($result);?>
9. 验证邮箱地址
有时候,当在网站填写表单,用户可能会输入错误的邮箱地址,这个函数可以验证邮箱地址是否有效。

function is_validemail($email){$check = 0;if(filter_var($email,FILTER_VALIDATE_EMAIL)){$check = 1;}return $check;}
语法:

<?php$email = "blog@koonk.com";$check = is_validemail($email);echo $check;// If the output is 1, then email is valid.?>
10. 获取用户的真实  IP

function getRealIpAddr() { if (!emptyempty($_SERVER["HTTP_CLIENT_IP"])) { $ip=$_SERVER["HTTP_CLIENT_IP"]; } elseif (!emptyempty($_SERVER["HTTP_X_FORWARDED_FOR"])) //to check ip is pass from proxy { $ip=$_SERVER["HTTP_X_FORWARDED_FOR"]; } else { $ip=$_SERVER["REMOTE_ADDR"]; } return $ip; }
语法:

<?php$ip = getRealIpAddr();echo $ip;?>
11. 转换 URL:从字符串变成超链接
如果你正在开发论坛,博客或者是一个常规的表单提交,很多时候都要用户访问一个网站。使用这个函数,URL 字符串就可以自动的转换为超链接。

function makeClickableLinks($text){$text = eregi_replace("(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)","<a href="1">1</a>", $text);$text = eregi_replace("([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)","1<a href="http://2">2</a>", $text);$text = eregi_replace("([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})","<a href="mailto:1">1</a>", $text);return $text; } 
语法:

<?php$text = "This is my first post on http://blog.koonk.com";$text = makeClickableLinks($text);echo $text;?>
12. 阻止多个 IP 访问你的网站
这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站

if ( !file_exists("blocked_ips.txt") ) { $deny_ips = array( "127.0.0.1", "192.168.1.1", "83.76.27.9", "192.168.1.163" );} else { $deny_ips = file("blocked_ips.txt");}// read user ip adress:$ip = isset($_SERVER["REMOTE_ADDR"]) ? trim($_SERVER["REMOTE_ADDR"]) : "";// search current IP in $deny_ips arrayif ( (array_search($ip, $deny_ips))!== FALSE ) { // address is blocked: echo "Your IP adress (".$ip.") was blocked!"; exit;}
13. 强制性文件下载
如果你需要下载特定的文件而不用另开新窗口,下面的代码片段可以帮助你。

function force_download($file){$dir = "../log/exports/";if ((isset($file))&&(file_exists($dir.$file))) {header("Content-type: application/force-download");header("Content-Disposition: inline; filename="" . $dir.$file . """);header("Content-Transfer-Encoding: Binary");header("Content-length: ".filesize($dir.$file));header("Content-Type: application/octet-stream");header("Content-Disposition: attachment; filename="" . $file . """);readfile("$dir$file");} else {echo "No file selected";}}
语法:

<phpforce_download("image.jpg");?>
14. 创建 JSON 数据
使用下面的 PHP 片段可以创建 JSON 数据,可以方便你创建移动应用的 Web 服务

$json_data = array ("id"=>1,"name"=>"Mohit");echo json_encode($json_data);
15. 压缩 zip 文件
使用下面的 PHP 片段可以即时压缩 zip 文件

function create_zip($files = array(),$destination = "",$overwrite = false) { //if the zip file already exists and overwrite is false, return false if(file_exists($destination) && !$overwrite) { return false; } //vars $valid_files = array(); //if files were passed in... if(is_array($files)) { //cycle through each file foreach($files as $file) { //make sure the file exists if(file_exists($file)) { $valid_files[] = $file; } } } //if we have good files... if(count($valid_files)) { //create the archive $zip = new ZipArchive(); if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) { return false; } //add the files foreach($valid_files as $file) { $zip->addFile($file,$file); } //debug //echo "The zip archive contains ",$zip->numFiles," files with a status of ",$zip->status;//close the zip -- done! $zip->close();//check to make sure the file exists return file_exists($destination); } else { return false; } } 
语法:

<?php$files=array("file1.jpg", "file2.jpg", "file3.gif"); create_zip($files, "myzipfile.zip", true);?>
16. 解压文件

function unzip($location,$newLocation){if(exec("unzip $location",$arr)){mkdir($newLocation);for($i = 1;$i< count($arr);$i++){$file = trim(preg_replace("~inflating: ~","",$arr[$i]));copy($location."/".$file,$newLocation."/".$file);unlink($location."/".$file);}return TRUE;}else{return FALSE;}}
语法:

<?phpunzip("test.zip","unziped/test"); //File would be unzipped in unziped/test folder?>
17. 缩放图片

function resize_image($filename, $tmpname, $xmax, $ymax) { $ext = explode(".", $filename); $ext = $ext[count($ext)-1];if($ext == "jpg" || $ext == "jpeg") $im = imagecreatefromjpeg($tmpname); elseif($ext == "png") $im = imagecreatefrompng($tmpname); elseif($ext == "gif") $im = imagecreatefromgif($tmpname);$x = imagesx($im); $y = imagesy($im);if($x <= $xmax && $y <= $ymax) return $im;if($x >= $y) { $newx = $xmax; $newy = $newx * $y / $x; } else { $newy = $ymax; $newx = $x / $y * $newy; }$im2 = imagecreatetruecolor($newx, $newy); imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y); return $im2; }
18. 使用 mail() 发送邮件
 之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段,但是如果你不想使用第三方服务,那么可以使用下面的 PHP 代码片段。

function send_mail($to,$subject,$body){$headers = "From: KOONK
";$headers .= "Reply-To: blog@koonk.com
";$headers .= "Return-Path: blog@koonk.com
";$headers .= "X-Mailer: PHP5
";$headers .= "MIME-Version: 1.0" . "
";$headers .= "Content-type: text/html; charset=iso-8859-1" . "
";mail($to,$subject,$body,$headers);} 
语法:

<?php$to = "admin@koonk.com";$subject = "This is a test mail";$body = "Hello World!";send_mail($to,$subject,$body);?>
19. 把秒转换成天数,小时数和分钟

function secsToStr($secs) {if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days." day";if($days<>1){$r.="s";}if($secs>0){$r.=", ";}}if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours." hour";if($hours<>1){$r.="s";}if($secs>0){$r.=", ";}}if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes." minute";if($minutes<>1){$r.="s";}if($secs>0){$r.=", ";}}$r.=$secs." second";if($secs<>1){$r.="s";}return $r;}
语法:

<?php$seconds = "56789";$output = secsToStr($seconds);echo $output;?>
20. 数据库连接
连接 MySQL 数据库

<?php$DBNAME = "koonk";$HOST = "localhost";$DBUSER = "root";$DBPASS = "koonk";$CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);if(!$CONNECT){echo "MySQL Error: ".mysql_error();}$SELECT = mysql_select_db($DBNAME);if(!$SELECT){echo "MySQL Error: ".mysql_error();}?>
21. 目录清单
使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹

function list_files($dir){if(is_dir($dir)){if($handle = opendir($dir)){while(($file = readdir($handle)) !== false){if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/){echo "<a target="_blank" href="".$dir.$file."">".$file."</a>"."
";}}closedir($handle);}}}
语法:

<?phplist_files("images/"); //This will list all files of images folder?>
22. 检测用户语言
使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言

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;}
23. 查看 CSV 文件

function readCSV($csvFile){$file_handle = fopen($csvFile, "r");while (!feof($file_handle) ) {$line_of_text[] = fgetcsv($file_handle, 1024);}fclose($file_handle);return $line_of_text;}
语法:

<?php$csvFile = "test.csv";$csv = readCSV($csvFile);$a = csv[0][0]; // This will get value of Column 1 & Row 1?>
以上就是本文的全部内容,希望对大家的学习有所帮助。