php 有用的代码小片段

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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
?>

24. 从 PHP 数据创建 CSV 文件

function generateCsv($data, $delimiter = ',', $enclosure = '"') {
   $handle = fopen('php://temp', 'r+');
   foreach ($data as $line) {
           fputcsv($handle, $line, $delimiter, $enclosure);
   }
   rewind($handle);
   while (!feof($handle)) {
           $contents .= fread($handle, 8192);
   }
   fclose($handle);
   return $contents;
}
   
语法：
<?php
$data[0] = "apple";
$data[1] = "oranges";
generateCsv($data, $delimiter = ',', $enclosure = '"');
?>

25. 解析 XML 数据

$xml_string="<?xml version='1.0'?>
<moleculedb>
    <molecule name='Benzine'>
        <symbol>ben</symbol>
        <code>A</code>
    </molecule>
    <molecule name='Water'>
        <symbol>h2o</symbol>
        <code>K</code>
    </molecule>
</moleculedb>";
     
//load the xml string using simplexml function
$xml = simplexml_load_string($xml_string);
     
//loop through the each node of molecule
foreach ($xml->molecule as $record)
{
   //attribute are accessted by
   echo $record['name'], '  ';
   //node are accessted by -> operator
   echo $record->symbol, '  ';
   echo $record->code, '';
}

26. 解析 JSON 数据

$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
$obj=json_decode($json_string);
//print the parsed data
echo $obj->name; //displays rolf
echo $obj->office[0]; //displays google

27. 获取当前页面 URL
这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面

function current_url()
{
$url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$validURL = str_replace("&", "&", $url);
return validURL;
}

语法：

<?php
echo "Currently you are on: ".current_url();
?>
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