php常用函式 2
阿新 • • 發佈:2018-12-12
主要方法包含 取檔案的字尾名 取隨機字串 使用加密和解密字串函式 獲取檔案的大小 對字串使用替換字元 獲取web伺服器的檔案路徑 獲取當前頁面的URL 檢測瀏覽器語言 建立一個目錄樹 下載本目錄下的某個檔案 頁面提示與跳轉 獲取各種編碼的固定長度 取得使用者的真實ip地址 陣列值轉換 js的unescape函式 unescape函式 防止SQL注入
/* * 取檔案的字尾名 */ function getExtension($filename){ $myext = substr($filename, strrpos($filename, '.')); //取得的字串為 .doc return str_replace('.','',$myext); //引數分別為 。。。 } $filename = '我的文件.doc'; echo getExtension($filename); /* * 取隨機字串 * length 長度 預設10 */ function omString($length = 10) { $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $randomString = ''; for ($i = 0; $i < $length; $i++) { $randomString .= $characters[rand(0, strlen($characters) - 1)]; } return $randomString; } echo omString(20); /* * 使用加密和解密字串函式 * key 加密密碼 * string 加密欄位 * decrypt 加密(0)或解密(1) */ function encryptDecrypt($key, $string, $decrypt){ if($decrypt){ $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($string), MCRYPT_MODE_CBC, md5(md5($key))), "12"); return $decrypted; }else{ $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key)))); return $encrypted; } } echo encryptDecrypt('eily', '玉娟',0); echo "<br />"; echo encryptDecrypt('eily', '6anhA2GKZLV/sn91lnZ/KSgnrfD05Mihj8ARQ8SAE7A=',1); /* * 獲取檔案的大小 */ function formatSize($size) { $sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB"); if ($size == 0) { return('n/a'); } else { return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]); } } $thefile = filesize('jquery-2.0.0.min.js'); echo formatSize($thefile); /* * 對字串使用替換字元 */ function stringParser($string,$replacer){ $result = str_replace(array_keys($replacer), array_values($replacer),$string); return $result; } $string = 'The {b}anchor text{/b} is the {b}actual word{/b} or words used {br}to describe the link {br}itself'; $replace_array = array('{b}' => '<b>','{/b}' => '</b>','{br}' => '<br />'); /* * 獲取web伺服器的檔案路徑 */ function listDirFiles($DirPath){ if($dir = opendir($DirPath)){ while(($file = readdir($dir))!== false){ if(!is_dir($DirPath.$file)) { echo "filename: $file<br />"; } } } } listDirFiles('/Users/eily/Documents'); /* * 獲取當前頁面的URL,不管是http還是https */ function curPageURL() { $pageURL = 'http'; if (!empty($_SERVER['HTTPS'])) {$pageURL .= "s";} $pageURL .= "://"; if ($_SERVER["SERVER_PORT"] != "80") { $pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]; } else { $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"]; } return $pageURL; } echo curPageURL(); -------------------------------------------------------------------------------- /* * 獲取編碼字串的指定長度,效果如下 * jQuery外掛實現的載入圖片和頁面... */ function cutStr($string, $sublen, $start = 0, $code = 'UTF-8'){ if($code == 'UTF-8'){ $pa = "/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/"; preg_match_all($pa, $string, $t_string); if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."..."; return join('', array_slice($t_string[0], $start, $sublen)); }else{ $start = $start*2; $sublen = $sublen*2; $strlen = strlen($string); $tmpstr = ''; for($i=0; $i<$strlen; $i++){ if($i>=$start && $i<($start+$sublen)){ if(ord(substr($string, $i, 1))>129){ $tmpstr.= substr($string, $i, 2); }else{ $tmpstr.= substr($string, $i, 1); } } if(ord(substr($string, $i, 1))>129) $i++; } if(strlen($tmpstr)<$strlen ) $tmpstr.= "..."; return $tmpstr; } } $str = "jQuery外掛實現的載入圖片和頁面效果"; echo cutStr($str,21,0,''); //3的倍數 -------------------------------------------------------------------------------- /* * 取得使用者的真實ip地址 */ function getIp() { if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) $ip = getenv("HTTP_CLIENT_IP"); else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) $ip = getenv("HTTP_X_FORWARDED_FOR"); else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) $ip = getenv("REMOTE_ADDR"); else if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) $ip = $_SERVER['REMOTE_ADDR']; else $ip = "unknown"; return ($ip); } echo getIp(); -------------------------------------------------------------------------------- /* * PHP防止SQL注入 */ function injCheck($sql_str) { $check = preg_match('/select,insert,update,delete,../|./|union|into|load_file|outfile/', $sql_str); if ($check) { echo '非法字元!!'; exit; } else { return $sql_str; } } echo injCheck('1 select 1=1'); /* * PHP頁面提示與跳轉 */ function message($msgTitle,$message,$jumpUrl){ $str = '<!DOCTYPE HTML>'; $str .= '<html>'; $str .= '<head>'; $str .= '<meta charset="utf-8">'; $str .= '<title>頁面提示</title>'; $str .= '<style type="text/css">'; $str .= '*{margin:0; padding:0}a{color:#369; text-decoration:none;}a:hover{text-decoration:underline}body{height:100%; font:12px/18px Tahoma, Arial, sans-serif; color:#424242; background:#fff}.message{width:450px; height:120px; margin:16% auto; border:1px solid #99b1c4; background:#ecf7fb}.message h3{height:28px; line-height:28px; background:#2c91c6; text-align:center; color:#fff; font-size:14px}.msg_txt{padding:10px; margin-top:8px}.msg_txt h4{line-height:26px; font-size:14px}.msg_txt h4.red{color:#f30}.msg_txt p{line-height:22px}'; $str .= '</style>'; $str .= '</head>'; $str .= '<body>'; $str .= '<div class="message">'; $str .= '<h3>'.$msgTitle.'</h3>'; $str .= '<div class="msg_txt">'; $str .= '<h4 class="red">'.$message.'</h4>'; $str .= '<p id="tz1">系統將在 <span style="color:blue;font-weight:bold">3</span> 秒後自動跳轉,如果不想等待,直接點選 <a href="'.$jumpUrl.'">這裡</a> 跳轉</p>'; $str .= "<script>setTimeout('location.href=".'"'.$jumpUrl.'"'."',2000)</script>"; $str .= '</div>'; $str .= '</div>'; $str .= '</body>'; $str .= '</html>'; echo $str; } message('操作提示','操作成功!','ajax.html'); /* *計算時長 */ function changeTimeType($seconds) { if ($seconds > 3600) { $hours = intval($seconds / 3600); $minutes = $seconds % 3600; $time = $hours . ":" . gmstrftime('%M:%S', $minutes); } else { $time = gmstrftime('%H:%M:%S', $seconds); } return $time; } $seconds = 3712; echo changeTimeType($seconds); /* *獲取客戶端IP */ function getClientIp() { $ip = NULL; if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']); $pos = array_search('unknown',$arr); if(false !== $pos) unset($arr[$pos]); $ip = trim($arr[0]); }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip = $_SERVER['HTTP_CLIENT_IP']; }elseif (isset($_SERVER['REMOTE_ADDR'])) { $ip = $_SERVER['REMOTE_ADDR']; } // IP地址合法驗證 $ip = (false !== ip2long($ip)) ? $ip : '0.0.0.0'; return $ip; } /* *獲取線上 端IP */ function getOnlineIp($format=0) { global $S_GLOBAL; if(empty($S_GLOBAL['onlineip'])) { if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) { $onlineip = getenv('HTTP_CLIENT_IP'); } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) { $onlineip = getenv('HTTP_X_FORWARDED_FOR'); } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) { $onlineip = getenv('REMOTE_ADDR'); } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) { $onlineip = $_SERVER['REMOTE_ADDR']; } preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches); $S_GLOBAL['onlineip'] = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown'; } if($format) { $ips = explode('.', $S_GLOBAL['onlineip']); for($i=0;$i<3;$i++) { $ips[$i] = intval($ips[$i]); } return sprintf('%03d%03d%03d', $ips[0], $ips[1], $ips[2]); } else { return $S_GLOBAL['onlineip']; } } getOnlineIp(); /* *獲取url */ function getUrl(){ $pageURL = 'http'; if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on") { $pageURL .= "s"; } $pageURL .= "://"; if ($_SERVER["SERVER_PORT"] != "80") { $pageURL .= $_SERVER["HTTP_HOST"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"]; } else { $pageURL .= $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]; } return $pageURL; } echo getUrl(); /* * 獲取url的路徑 */ function getSiteUrl() { $uri = $_SERVER['REQUEST_URI']?$_SERVER['REQUEST_URI']:($_SERVER['PHP_SELF']?$_SERVER['PHP_SELF']:$_SERVER['SCRIPT_NAME']); return 'http://'.$_SERVER['HTTP_HOST'].substr($uri, 0, strrpos($uri, '/')+1); } echo getSiteUrl(); /* * 獲取各種編碼的固定長度 */ function msubstr($str, $start=0, $length=15, $charset="utf-8", $suffix=true) { if(function_exists("mb_substr")) { return mb_substr($str, $start, $length, $charset); } elseif(function_exists('iconv_substr')) { return iconv_substr($str,$start,$length,$charset); } $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/"; $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/"; $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/"; $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/"; preg_match_all($re[$charset], $str, $match); $slice = join("",array_slice($match[0], $start, $length)); if($suffix) { $slice=($slice.'...'); return $slice; } return $slice; } $ss='按時打算的撒的撒打算的撒的撒的撒的撒的撒的的撒的123'; echo msubstr($ss,0,11,'utf-8')."..."; /* * js的escape函式 */ function escape($string, $encoding = 'UTF-8'){ $return = null; for ($x = 0; $x < mb_strlen($string, $encoding);$x ++) { $str = mb_substr($string, $x, 1, $encoding); if (strlen($str) > 1) { // 多位元組字元 $return .= "%u" . strtoupper(bin2hex(mb_convert_encoding($str, 'UCS-2', $encoding))); } else { $return .= "%" . strtoupper(bin2hex($str)); } } return $return; } $ss='aaaaaaaaaa'; echo escape($ss); /* * js的unescape函式 */ function unescape($str) { $str = rawurldecode($str); preg_match_all("/(?:%u.{4})|.{4};|&#\d+;|.+/U",$str,$r); $ar = $r[0]; foreach($ar as $k=>$v) { if(substr($v,0,2) == "%u"){ $ar[$k] = iconv("UCS-2","utf-8//IGNORE",pack("H4",substr($v,-4))); } elseif(substr($v,0,3) == "") { $ar[$k] = iconv("UCS-2","utf-8",pack("H4",substr($v,3,-1))); } elseif(substr($v,0,2) == "&#") { echo substr($v,2,-1).""; $ar[$k] = iconv("UCS-2","utf-8",pack("n",substr($v,2,-1))); } } return join("",$ar); } $ss='aaaaaaaaaa'; echo escape($ss); -------------------------------------------------------------------------------- /* * 陣列值轉換 */ function makeSemiangle($str) { $arr = array( '0' => '0', '1' => '1', '2' => '2', '3' => '3', '4' => '4', '5' => '5', '6' => '6', '7' => '7', '8' => '8', '9' => '9', 'A' => 'A', 'B' => 'B', 'C' => 'C', 'D' => 'D', 'E' => 'E', 'F' => 'F', 'G' => 'G', 'H' => 'H', 'I' => 'I', 'J' => 'J', 'K' => 'K', 'L' => 'L', 'M' => 'M', 'N' => 'N', 'O' => 'O', 'P' => 'P', 'Q' => 'Q', 'R' => 'R', 'S' => 'S', 'T' => 'T', 'U' => 'U', 'V' => 'V', 'W' => 'W', 'X' => 'X', 'Y' => 'Y', 'Z' => 'Z', 'a' => 'a', 'b' => 'b', 'c' => 'c', 'd' => 'd', 'e' => 'e', 'f' => 'f', 'g' => 'g', 'h' => 'h', 'i' => 'i', 'j' => 'j', 'k' => 'k', 'l' => 'l', 'm' => 'm', 'n' => 'n', 'o' => 'o', 'p' => 'p', 'q' => 'q', 'r' => 'r', 's' => 's', 't' => 't', 'u' => 'u', 'v' => 'v', 'w' => 'w', 'x' => 'x', 'y' => 'y', 'z' => 'z', '(' => '(', ')' => ')', '〔' => '[', '〕' => ']', '【' => '[', '】' => ']', '〖' => '[', '〗' => ']', '{' => '{', '}' => '}', '《' => '<', '》' => '>', '%' => '%', '+' => '+', '—' => '-', '-' => '-', '〜' => '-', ':' => ':', '。' => '.', '、' => ',', ',' => '.', '、' => '.', ';' => ';', '?' => '?', '!' => '!', '⋯' => '-', '‖' => '|', '”' => '"', '“' => '"', '‘' => '`', '|' => '|', '〃' => '"', ' ' => ' ','.' => '.'); return strtr($str, $arr); } echo makeSemiangle('〖'); /* * 下載本目錄下的某個檔案 */ function downloads($filename,$dir='./'){ $filepath = $dir.$filename; if (!file_exists($filepath)){ header("Content-type: text/html; charset=utf-8"); echo "File not found!"; exit; } else { $file = fopen($filepath,"r"); Header("Content-type: application/octet-stream"); Header("Accept-Ranges: bytes"); Header("Accept-Length: ".filesize($filepath)); Header("Content-Disposition: attachment; filename=".$filename); echo fread($file, filesize($filepath)); fclose($file); } } echo downloads('aj.php'); /* * 建立一個目錄樹 */ function mkdirs($dir, $mode = 0777) { if (!is_dir($dir)) { mkdirs(dirname($dir), $mode); return mkdir($dir, $mode); } return true; } mkdir ( "/aa/to/my/dir" , 0700 ); /* * 檢測瀏覽器語言 */ function get_client_language($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; }