PHP常用函数封装
//二分查找function bin_sch($array, $low, $high, $k){ ???if ($low <= $high) { ???????$mid = intval(($low + $high) / 2); ???????if ($array[$mid] == $k) { ???????????return $mid; ???????} elseif ($k < $array[$mid]) { ???????????return bin_sch($array, $low, $mid - 1, $k); ???????} else { ???????????return bin_sch($array, $mid + 1, $high, $k); ???????} ???} ???return -1;} ?//顺序查找（数组里查找某个元素）function seq_sch($array, $n, $k){ ???$array[$n] = $k; ???for ($i = 0; $i < $n; $i++) { ???????if ($array[$i] == $k) { ???????????break; ???????} ???} ???if ($i < $n) { ???????return $i; ???} else { ???????return -1; ???}} ?//线性表的删除（数组中实现）function delete_array_element($array, $i){ ???$len = count($array); ???for ($j = $i; $j < $len; $j++) { ???????$array[$j] = $array[$j + 1]; ???} ???array_pop($array); ???return $array;}//冒泡排序（数组排序）function bubble_sort($array){ ???$count = count($array); ???if ($count <= 0) return false; ???for ($i = 0; $i < $count; $i++) { ???????for ($j = $count - 1; $j > $i; $j--) { ???????????if ($array[$j] < $array[$j - 1]) { ???????????????$tmp = $array[$j]; ???????????????$array[$j] = $array[$j - 1]; ???????????????$array[$j - 1] = $tmp; ???????????} ???????} ???} ???return $array;} ?//快速排序（数组排序）function quick_sort($array){ ???if (count($array) <= 1) return $array; ???$key = $array[0]; ???$left_arr = array(); ???$right_arr = array(); ???for ($i = 1; $i < count($array); $i++) { ???????if ($array[$i] <= $key) ???????????$left_arr[] = $array[$i]; ???????else ???????????$right_arr[] = $array[$i]; ???} ???$left_arr = quick_sort($left_arr); ???$right_arr = quick_sort($right_arr); ???return array_merge($left_arr, array($key), $right_arr);} //获得文件属性 $file是文件路径如$_SERVER[‘SCRIPT_FILENAME‘],$flag文件的某个属性function getFileAttr($file, $flag){ ???if (!file_exists($file)) { ???????return false; ???} ???switch ($flag) { ???????case ‘dir‘: ???????????if (is_file($file)) ???????????????return dirname($file); ???????????return realpath($file); ???????????break; ???????case ‘name‘: ???????????if (is_file($file)) ???????????????return basename($file); ???????????return ‘-‘; ???????????break; ???????case ‘size‘: ???????????if (is_file($file)) ???????????????return filesize($file); ???????????return ‘-‘; ???????????break; ???????case ‘perms‘: ???????????return substr(sprintf(‘%o‘, fileperms($file)), -4);; ???????????break; ???????case ‘ower‘: ???????????return fileowner($file); ???????????break; ???????case ‘owername‘: ???????????$ownerInfo = posix_getpwuid(fileowner($file)); ???????????return isset($ownerInfo[‘name‘]) ? $ownerInfo[‘name‘] : false; ???????????break; ???????case ‘groupname‘: ???????????$ownerInfo = posix_getpwuid(filegroup($file)); ???????????return isset($ownerInfo[‘name‘]) ? $ownerInfo[‘name‘] : false; ???????????break; ???????case ‘ctime‘: ???????????return filectime($file); ???????????break; ???????case ‘mtime‘: ???????????return filemtime($file); ???????????break; ???????case ‘atime‘: ???????????return fileatime($file); ???????????break; ???????case ‘suffix‘: ???????????if (is_file($file)) ???????????????return substr($file, strrpos($file, ‘.‘) + 1); ???????????return ‘-‘; ???????????break; ???????default: ???????????return false; ???????????break; ???}} /** * 整理json格式字符串数据 * @param string $json json格式字符串数据 * @param bool|false $assoc * @param int $depth * @param int $options * @return mixed */public function json_clean_decode($json, $assoc = false, $depth = 512, $options = 0){ ???$json = str_replace(array("\n", "\r"), "", $json); ???$json = preg_replace("#(/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+/)|([\s\t](//).*)#", ‘‘, $json); ???$json = preg_replace(‘/([{,]+)(\s*)([^"]+?)\s*:/‘, ‘$1"$3":‘, $json); ???$json = preg_replace(‘/(,)\s*}$/‘, ‘}‘, $json); ???if (version_compare(phpversion(), ‘5.4.0‘, ‘>=‘)) { ???????$json = json_decode($json, $assoc, $depth, $options); ???} elseif (version_compare(phpversion(), ‘5.3.0‘, ‘>=‘)) { ???????$json = json_decode($json, $assoc, $depth); ???} else { ???????$json = json_decode($json, $assoc); ???} ???return $json;} ?/** * 判断$strJson是否是一个有效的json格式字符串 * @param $strJson * @return bool */public function isValidJson($strJson){ ???json_decode($strJson); ???return (json_last_error() === JSON_ERROR_NONE);} ?/** * 去掉字符串中的斜线(单斜线和双斜线) * @param string $string * @return string */public static function removeslashes($string = ‘‘){ ???$string = implode("", explode("\\", $string)); ???return stripslashes(trim($string));}//去除数组中的单斜线function stripslashes_deep($value){ ???$value = is_array($value) ? array_map(‘stripslashes_deep‘, $value) : stripslashes($value); ???return $value;}//入库添加斜线 防sql注入function add_slashes_recursive( $variable ){ ???if ( is_string( $variable ) ) ???????return addslashes( $variable ) ; ???elseif ( is_array( $variable ) ) ???????foreach( $variable as $i => $value ) ???????????$variable[ $i ] = add_slashes_recursive( $value ) ; ???return $variable ;} //页面显示时去掉数据库中数据的斜线function strip_slashes_recursive( $variable ){ ???if ( is_string( $variable ) ) ???????return stripslashes( $variable ) ; ???if ( is_array( $variable ) ) ???????foreach( $variable as $i => $value ) ???????????$variable[ $i ] = strip_slashes_recursive( $value ) ; ???????return $variable ; }数据库操作/** * 连接MYSQL函数,需要在连接的时候传递一个数组 * @param array $config * @return resource */function connect1 ($config){ ???//连接mysql ???$link=@mysql_connect($config[‘host‘],$config[‘username‘],$config[‘password‘]) or die (‘数据库连接失败<br/>ERROR ‘.mysql_errno().‘:‘.mysql_error()); ???//设置字符集 ???mysql_set_charset($config[‘charset‘]); ???//打开指定的数据库 ???mysql_select_db($config[‘dbName‘]) or die(‘指定的数据库打开失败‘); ??????return $link;}/**建议使用该函数 * 连接MYSQL函数,通过常量的形式来连接数据库 * 自定义配置文件，配置文件中自定义常量，包含需要使用的信息 * @return resource */function connect2 (){ ????//连接mysql ???$link=@mysql_connect(DB_HOST,DB_USER,DB_PWD) or die (‘数据库连接失败<br/>ERROR ‘.mysql_errno().‘:‘.mysql_error()); ???//设置字符集 ??????mysql_set_charset(DB_CHARSET); ???//打开指定的数据库 ???mysql_select_db(DB_DBNAME) or die(‘指定的数据库打开失败‘); ???return $link;}/* array(‘username‘=>‘king‘,‘password‘=>‘123123‘,‘email‘=>‘dh@qq.com‘) *//** * 插入记录的操作 * @param array $array * @param string $table * @return boolean */function insert($array,$table){ ???$keys=join(‘,‘,array_keys($array)); ???$values="‘".join("‘,‘", array_values($array))."‘"; ???$sql="insert {$table}({$keys}) VALUES ({$values})"; ???$res=mysql_query($sql); ???if($res){ ???????return mysql_insert_id(); ???}else{ ???????return false; ???}}/** * MYSQL更新操作 * @param array $array * @param string $table * @param string $where * @return number|boolean */function update($array,$table,$where=null){ ???foreach ($array as $key=>$val){ ???????$sets.=$key."=‘".$val."‘,"; ???} ???$sets=rtrim($sets,‘,‘); //去掉SQL里的最后一个逗号 ???$where=$where==null?‘‘:‘ WHERE ‘.$where; ???$sql="UPDATE {$table} SET {$sets} {$where}"; ???$res=mysql_query($sql); ???if ($res){ ???????return mysql_affected_rows(); ???}else { ???????return false; ???}}/** * 删除记录的操作 * @param string $table * @param string $where * @return number|boolean */function delete($table,$where=null){ ???$where=$where==null?‘‘:‘ WHERE ‘.$where; ???$sql="DELETE FROM {$table}{$where}"; ???$res=mysql_query($sql); ???if ($res){ ???????return mysql_affected_rows(); ???}else { ???????return false; ???}}/** * 查询一条记录 * @param string $sql * @param string $result_type * @return boolean */function fetchOne($sql,$result_type=MYSQL_ASSOC){ ???$result=mysql_query($sql); ???if ($result && mysql_num_rows($result)>0){ ???????return mysql_fetch_array($result,$result_type); ???}else { ???????return false; ???}}/** * 得到表中的所有记录 * @param string $sql * @param string $result_type * @return boolean */function fetchAll($sql,$result_type=MYSQL_ASSOC){ ???$result=mysql_query($sql); ???if ($result && mysql_num_rows($result)>0){ ???????while ($row=mysql_fetch_array($result,$result_type)){ ???????????$rows[]=$row; ???????} ???????return $rows; ???}else { ???????return false; ???}}/**取得结果集中的记录的条数 * @param string $sql * @return number|boolean */function getTotalRows($sql){ ???$result=mysql_query($sql); ???if($result){ ???????return mysql_num_rows($result); ???}else { ???????return false; ???} ??}/**释放结果集 * @param resource $result * @return boolean */function ?freeResult($result){ ???return ?mysql_free_result($result);}/**断开MYSQL * @param resource $link * @return boolean */function close($link=null){ ???return mysql_close($link);}/**得到客户端的信息 * @return string */function getClintInfo(){ ???return mysql_get_client_info();}/**得到MYSQL服务器端的信息 * @return string */function getServerInfo($link=null){ ???return mysql_get_server_info($link);}/**得到主机的信息 * @return string */function getHostInfo($link=null){ ???return mysql_get_host_info($link);}/**得到协议信息 * @return string*/function getProtoInfo($link=null){ ???return mysql_get_proto_info($link);}/** * 根据数据中的某一字段排序 * @param array $array 原始数组 * @param $field 数组字段 * @param bool|false $desc */public function sortArrByField(&$array, $field, $desc = true){ ???$fieldArr = array(); ???foreach ($array as $k => $v) { ???????$fieldArr[$k] = $v[$field]; ???} ???$sort = $desc ?? SORT_DESC : SORT_ASC ; ???array_multisort($fieldArr, $sort, $array);}//获得数组中重复的数据function fetchRepeatMemberInArray($array){ ???// 获取去掉重复数据的数组 ???$unique_arr = array_unique($array); ???// 获取重复数据的数组 ???$repeat_arr = array_diff_assoc($array, $unique_arr); ???return $repeat_arr;}//PHP实现双端队列class Deque{ ???public $queue = array(); ???/**（尾部）入队 ?**/ ???public function addLast($value) ???{ ???????return array_push($this->queue,$value); ???} ???/**（尾部）出队**/ ???public function removeLast() ???{ ???????return array_pop($this->queue); ???} ???/**（头部）入队**/ ???public function addFirst($value) ???{ ???????return array_unshift($this->queue,$value); ???} ???/**（头部）出队**/ ???public function removeFirst() ???{ ???????return array_shift($this->queue); ???} ???/**清空队列**/ ???public function makeEmpty() ???{ ???????unset($this->queue); ???} ???/**获取列头**/ ???public function getFirst() ???{ ???????return reset($this->queue); ???} ???/** 获取列尾 **/ ???public function getLast() ???{ ???????return end($this->queue); ???} ???/** 获取长度 **/ ???public function getLength() ???{ ???????return count($this->queue); ???}}PHP常用函数封装
原文地址：https://www.cnblogs.com/qixidi/p/10199667.html