必须收藏的23个php实用代码片段

前端技术 2023/09/07 PHP

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 verification
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
      
      
//get response
$output = curl_exec($ch);
//Print error if any
if(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 slashes
    if (get_magic_quotes_gpc())
    {
      $output = stripslashes($output);
    }
    // $output = strip_tags($output);
    $output = htmlentities($output, ENT_QUOTES, \'UTF-8\');
  }
// return the clean text
  return $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) . \"\\n\";
}
}

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, $domain.\"\\r\\n\");
    while(!feof($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 $deny_ips array
if ( (array_search($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： 

<php
force_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： 

<?php
unzip(\'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\\r\\n\";
$headers .= \"Reply-To: blog@koonk.com\\r\\n\";
$headers .= \"Return-Path: blog@koonk.com\\r\\n\";
$headers .= \"X-Mailer: PHP5\\n\";
$headers .= \'MIME-Version: 1.0\' . \"\\n\";
$headers .= \'Content-type: text/html; charset=iso-8859-1\' . \"\\r\\n\";
mail($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>\'.\"\\n\";
        }
      }
      closedir($handle);
    }
  }
}

语法： 

<?php
  list_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。

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