PHP是一種HTML內嵌式的語言，是一種在服務器端執行的嵌入HTML文檔的腳本語言。PHP擁有數以百計的基本功能，支持上千種擴展。這些功能都被很好的加載在PHP站點上，但內置的庫有各種各樣的命名。在PHP代碼庫中包含了無數個有用的PHP代碼片段，每位開發者都需要不斷完善自己的“工具箱”。有了這些代碼片段可以為你節省大量的時間，一起來看下。

1.查找Longitudes與Latitudes之間的距離

<?phpfunction 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 => $html' target='_blank'>value) {echo $unit.': '.number_format($value,4).'';}/*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

<?phpfunction 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、清理用戶輸入

<?phpfunction 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($input)) {foreach($input as $var=>$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、通過IP（城市、國家）檢測地理位置

<?phpfunction 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('{City : ([^<]*)}i', $content, $regs) ) { $city = $regs[1]; } if ( preg_match('{State/Province : ([^<]*)}i', $content, $regs) ) { $state = $regs[1]; } if( $city!='' && $state!='' ){ $location = $city . ', ' . $state; return $location; }else{ return $default; } }?>

5.設置密碼強度

<?phpfunction 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"));?>        
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