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[PHP代码] php常用函数

发表于 2018-1-3 08:00:00
/ ****php常用函数 / 1、加密解密字符串 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 $encrypted; } } //以下是将字符串“Helloweba欢迎您”分别加密和解密 //加密: echo encryptDecrypt('password', 'Helloweba欢迎您',0); //解密: echo encryptDecrypt('password', 'z0JAx4qMwcF+db5TNbp/xwdUM84snRsXvvpXuaCa4Bk=',1); 2、php生成随机字符串 字母和数字的集合 function generateRandomString($length = 10) { $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $randomString = ''; for ($i = 0; $i < $length; $i++) { $randomString .= $characters[rand(0, strlen($characters) - 1)]; } return $randomString; } 3、php获取文件后缀名 function getExtension($filename){ $myext = substr($filename, strrpos($filename, '.')); return str_replace('.','',$myext); } 4、php获取文件大小并格式化 以下使用的函数可以获取文件的大小,并且转换成便于阅读的KB,MB等格式。 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]); } } //$thefile = filesize('test_file.mp3'); 5、php替换字符标签 function stringParser($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'; $replace_array = array('{b}' => '','{/b}' => '','{br}' => '
'); echo stringParser($string,$replace_array); 6、php列出文件夹下的所有文件名 function listDirFiles($DirPath){ if($dir = opendir($DirPath)){ while(($file = readdir($dir))!== false){ if(!is_dir($DirPath.$file)) { echo "filename: $file
"; } } } } //listDirFiles('home/some_folder/'); 7、php获取当前网页的url 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 $pageURL; } echo curPageURL(); 8、php强制下载文件 function download($filename){ if ((isset($filename))&&(file_exists($filename))){ header("Content-length: ".filesize($filename)); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="' . $filename . '"'); readfile("$filename"); } else { echo "Looks like file does not exist!"; } } download('/down/test_45f73e852.zip'); 9、php字符串的截取 限制长度后用'...'显示 /* Utf-8、gb2312都支持的汉字截取函数 cut_str(字符串, 截取长度, 开始长度, 编码); 编码默认为 utf-8 开始长度默认为 0 */ 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; } } $str = "jQuery插件实现的加载图片和页面效果"; echo cutStr($str,16); 10、PHP获取客户端真实IP //获取用户真实IP 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(); 11、随机颜色生成器 function rabdowColor(){ $rand = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'); $color = '#'.$rand[rand(0,15)].$rand[rand(0,15)].$rand[rand(0,15)].$rand[rand(0,15)].$rand[rand(0,15)].$rand[rand(0,15)]; return $color; } //$color =rabdowColor(); 12、二维数组去重函数 function unique($data = array()){ $tmp = array(); foreach($data as $key => $value){ //把一维数组键值与键名组合 foreach($value as $key1 => $value1){ $value[$key1] = $key1 . '_|_' . $value1;//_|_分隔符复杂点以免冲突 } $tmp[$key] = implode(',|,', $value);//,|,分隔符复杂点以免冲突 } //对降维后的数组去重复处理 $tmp = array_unique($tmp); //重组二维数组 $newArr = array(); foreach($tmp as $k => $tmp_v){ $tmp_v2 = explode(',|,', $tmp_v); foreach($tmp_v2 as $k2 => $v2){ $v2 = explode('_|_', $v2); $tmp_v3[$v2[0]] = $v2[1]; } $newArr[$k] = $tmp_v3; } return $newArr; } $newArr = unique($list); 13、截取两个字符之间的内容 function strCutByStr(&$str, $findStart, $findEnd = false, $encoding = 'utf-8'){ if(is_array($findStart)){ if(count($findStart) === count($findEnd)){ foreach($findStart as $k => $v){ if(($result = strCutByStr($str, $v, $findEnd[$k], $encoding)) !== false){ return $result; } } return false; }else{ return false; } } if(($start = mb_strpos($str, $findStart, 0, $encoding)) === false){ return false; } $start += mb_strlen($findStart, $encoding); if($findEnd === false){ return mb_substr($str, $start, NULL, $encoding); } if(($length = mb_strpos($str, $findEnd, $start, $encoding)) === false){ return false; } return mb_substr($str, $start, $length - $start, $encoding); } $str = '1那是一场23我问问4567890维稳'; echo (strCutByStr($str, '那是', '稳'));//输出 一场23我问问4567890维 此内容为网上的内容,如有侵权请联系删除,谢谢。


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