在编程中，总会有一些很通用的需求，或许前人已经给我们造好了轮子，只是我们没有发现。本文就分享一些常见的实用功能代码段。
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;
?>
以上就是php发送短信邮件等众多实用php代码分享的详细内容。