直接拿来用的10个PHP代码片段

转自http://www.phpchina.com/archives/view-43035-1.html   http://codegeekz.com/10-php-snippets-for-developers/

PHP是一种HTML内嵌式的语言，是一种在服务器端执行的嵌入HTML文档的脚本语言。PHP拥有数以百计的基本功能，支持上千种扩展。这些功能都被很好的加载在PHP站点上，但内置的库有各种各样的命名。在PHP代码库中包含了无数个有用的PHP代码片段，每位开发者都需要不断完善自己的“工具箱”。有了这些代码片段可以为你节省大量的时间，一起来看下

1.查找Longitudes与Latitudes之间的距离

function getDistanceBetweenPointsNew($latitude1,$longitude1,$latitude2,$longitude2){$theta = $longitude1 - $longitude2;$miles = (sin(deg2rad($latitude1))* sin(deg2rad($latitude2)))+ (cos(deg2rad($latitude1))* cos(deg2rad($latitude2))* cos(deg2rad($theta)));$miles = acos($miles);$miles = rad2deg($miles);$miles = $miles * 60 * 1.1515;$feet = $miles * 5280;$yards = $feet / 3;$kilometers = $miles * 1.609344;$meters = $kilometers * 1000;return compact('miles','feet','yards','kilometers','meters');} $point1 = array('lat'=> 40.770623, 'long' => -73.964367);$point2 = array('lat'=> 40.758224, 'long' => -73.917404);$distance = getDistanceBetweenPointsNew($point1['lat'],$point1['long'],$point2['lat'],$point2['long']);foreach ($distance as $unit => $value){echo$unit.': '.number_format($value,4).'<br />';} The example returns the following: miles: 2.6025feet: 13,741.4350yards: 4,580.4783kilometers: 4.1884meters: 4,188.3894

2.完善cURL功能

function xcurl($url,$ref=null,$post=array(),$ua="Mozilla/5.0 (X11; Linux x86_64; rv:2.2a1pre) Gecko/20110324 Firefox/4.2a1pre",$print=false){$ch = curl_init();curl_setopt($ch, CURLOPT_AUTOREFERER,true);if(!empty($ref)){curl_setopt($ch, CURLOPT_REFERER,$ref);}curl_setopt($ch, CURLOPT_URL,$url);curl_setopt($ch, CURLOPT_HEADER,0);curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1);curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);if(!empty($ua)){curl_setopt($ch, CURLOPT_USERAGENT,$ua);}if(count($post)>0){curl_setopt($ch, CURLOPT_POST,1);curl_setopt($ch, CURLOPT_POSTFIELDS,$post);}$output = curl_exec($ch);curl_close($ch);if($print){print($output);} else {return $output;}}

3.清理用户输入

function cleanInput($input){ $search = array('@<script[^>]*?>.*?</script>@si',// Strip out javascript'@<[\/\!]*?[^<>]*?>@si',// Strip out HTML tags'@<style[^>]*?>.*?</style>@siU',// Strip style tags properly'@<![\s\S]*?--[ \t\n\r]*>@' // Strip multi-line comments); $output = preg_replace($search,'',$input);return $output;}?><?phpfunction sanitize($input){if (is_array($input)){foreach($inputas$var=>$val){$output[$var]= sanitize($val);}}else {if (get_magic_quotes_gpc()){$input = stripslashes($input);}$input = cleanInput($input);$output = mysql_real_escape_string($input);}return $output;}

4.通过IP（城市、国家）检测地理位置

function detect_city($ip){ $default = 'Hollywood, CA'; if (!is_string($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; } }

5.设置密码强度

/**  *   * @param String $string  * @return float  *   * Returns a float between 0 and 100. The closer the number is to 100 the  * the stronger password is; further from 100 the weaker the password is.  */ function password_strength($string){     $h    = 0;     $size = strlen($string);     foreach(count_chars($string, 1) as $v){         $p = $v / $size;         $h -= $p * log($p) / log(2);     }     $strength = ($h / 4) * 100;     if($strength > 100){         $strength = 100;     }     return $strength; } var_dump(password_strength("Correct Horse Battery Staple")); echo "<br>"; var_dump(password_strength("Super Monkey Ball")); echo "<br>"; var_dump(password_strength("Tr0ub4dor&3")); echo "<br>"; var_dump(password_strength("abc123")); echo "<br>"; var_dump(password_strength("sweet"));

6.检测浏览器语言，只提供可用的$availableLanguages作为数组(‘en’, ‘de’, ‘es’)

function get_client_language($availableLanguages,$default='en'){ if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])){ $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']); //start going through each oneforeach ($langs as $value){ $choice=substr($value,0,2);if(in_array($choice,$availableLanguages)){return $choice; } }} return $default;}

7.创建数据URL

function data_uri($file, $mime) {  $contents=file_get_contents($file);  $base64=base64_encode($contents);  echo "data:$mime;base64,$base64";}

8.创建更加友好的页面标题SEO URL

function make_seo_name($title){    return preg_replace('/[^a-z0-9_-]/i','',strtolower(str_replace(' ', '-', trim($title))));}

9.终极加密功能

// f(ucking) u(ncrackable) e(ncryption) function by BlackHatDBL (www.netforme.net)function fue($hash,$times){// Execute the encryption(s) as many times as the user wantsfor($i=$times;$i>0;$i--){// Encode with base64...$hash=base64_encode($hash);// and md5...$hash=md5($hash);// sha1...$hash=sha1($hash);// sha256... (one more)$hash=hash("sha256",$hash);// sha512$hash=hash("sha512",$hash); }// Finaly, when done, return the valuereturn $hash;}

10a.Tweeter Feed Runner——使用任意twitter名，可在任意页面上加载用户资源。

class Twitter{     protected $twitURL = 'http://api.twitter.com/1/';     protected $xml;     protected $tweets  = array(), $twitterArr = array();     protected $pversion = "1.0.0";     public function pversion(){         return $this->pversion;     }     public function loadTimeline($user, $max = 20){         $this->twitURL .= 'statuses/user_timeline.xml?screen_name='.$user.'&count='.$max;         $ch        = curl_init();         curl_setopt($ch, CURLOPT_URL, $this->twitURL);         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);         $this->xml = curl_exec($ch);         return $this;     }     public function getTweets(){         $this->twitterArr = $this->getTimelineArray();         $tweets = array();         foreach($this->twitterArr->status as $status){             $tweets[$status->created_at->__toString()] = $status->text->__toString();         }         return $tweets;     }     public function getTimelineArray(){         return simplexml_load_string($this->xml);     }     public function formatTweet($tweet){         $tweet = preg_replace("/(http(.+?))( |$)/","<a href=\"$0\">$1</a>$3", $tweet);         $tweet = preg_replace("/#(.+?)(\h|\W|$)/", "<a href=\"https://twitter.com/i/#!/search/?q=%23$1&src=hash\">#$1</a>$2", $tweet);         $tweet = preg_replace("/@(.+?)(\h|\W|$)/", "<a href=\"http://twitter.com/#!/$1\">@$1</a>$2", $tweet);         return $tweet;     } }

10b. Tweeter Feed Runner——用于在主题中创建文件，比如：example.php

$twitter = new Twitter(); $feed = $twitter->loadTimeline("phpsnips")->getTweets(); foreach($feed as $time => $message){     echo "<div class='tweet'>".$twitter->formatTweet($message)."<br />At: ".$time."</div>"; }