/**
     * 删除记录的操作
     * @param $table
     * @param null $where
     * @param null $order
     * @param int $limit
     * @return bool|int
     */
    public static function delete($table, $where = null, $order = null, $limit = 0)
    {
        $sql = "DELETE FROM {$table} " . self::parseWhere($where) . self::parseOrder($order) . self::parseLimit($limit);
        return self::execute($sql);
    }

PdoMYSQL.class.func

<?php

class PdoMYSQL
{
    public static $config = array();//设置配置参数，配置信息
    public static $link = null;//保存连接标识符
    public static $pconnect = false;//是否开启长连接
    public static $dbVersion = null;//保存数据库版本
    public static $connected = false;//判断是否连接成功
    public static $PDOStatement = null;//保存PDOStatement对象
    public static $queryStr = null;//保存最后执行的操作
    public static $error = null;//保存错误信息
    public static $lastInsertId = null;//保存上一步插入操作产生AUTO_INCREMENT
    public static $numRows = 0;//上一步操作产生受影响的记录的条数

    public function __construct($dbConfig = '')
    {
        if (!class_exists("PDO")) {
            self::throw_exception('不支持PDO，请先开启');
        }
        if (!is_array($dbConfig)) {
            $dbConfig = array(
                'hostname' => DB_HOST,
                'username' => DB_USER,
                'password' => DB_PWD,
                'database' => DB_NAME,
                'hostport' => DB_PORT,
                'dsn' => DB_TYPE . ":host=" . DB_HOST . ";dbname=" . DB_NAME);
        }
        if (empty($dbConfig['hostname']))
            self::throw_exception('没有定义数据库配置，请先定义');
        self::$config = $dbConfig;
        if (empty(self::$config['params']))
            self::$config['params'] = array();
        if (!isset(self::$link)) {
            $configs = self::$config;
            if (self::$pconnect) {
                //开启长连接，添加到配置数组中
                $configs['params'][constant("PDO::ATTR_PERSISTENT")] = true;
            }
            try {
                self::$link = new PDO($configs['dsn'], $configs['username'], $configs['password'], $configs['params']);
            } catch (PDOException $e) {
                self::throw_exception($e->getMessage());
            }
            if (!self::$link) {
                self::throw_exception('PDO连接错误');
                return false;
            }
            self::$link->exec('SET NAMES ' . DB_CHARSET);
            self::$dbVersion = self::$link->getAttribute(constant("PDO::ATTR_SERVER_VERSION"));
            self::$connected = true;
            unset($configs);
        }
    }

    /**得到所有记录
     * @param null $sql
     * @return mixed
     */
    public static function getAll($sql = null)
    {
        if ($sql != null) {
            self::query($sql);
        }
        $result = self::$PDOStatement->fetchAll(constant("PDO::FETCH_ASSOC"));
        return $result;
    }

    /**
     * 得到结果集的一条记录
     * @param null $sql
     * @return mixed
     */
    public static function getRow($sql = null)
    {
        if ($sql != null) {
            self::query($sql);
        }
        $result = self::$PDOStatement->fetch(constant("PDO::FETCH_ASSOC"));
        return $result;
    }


    /** 根据主键查找记录
     * @param $tabName
     * @param $priId
     * @param string $fields
     * @return mixed
     */
    public static function findById($tabName, $priId, $fields = '*')
    {
        $sql = 'SELECT %s FROM %s WHERE id=%d;';
        return self::getRow(sprintf($sql, self::parseFields($fields), $tabName, $priId));
    }

    /**
     * 执行普通查询
     * @param $tables
     * @param null $where
     * @param string $fields
     * @param null $group
     * @param null $having
     * @param null $order
     * @param null $limit
     * @return mixed
     */
    public static function find($tables, $where = null, $fields = '*', $group = null, $having = null, $order = null, $limit = null)
    {
        $sql = 'SELECT ' . self::parseFields($fields) . ' FROM ' . $tables . ' '
            . self::parseWhere($where)
            . self::parseGroup($group)
            . self::parseHaving($having)
            . self::parseOrder($order)
            . self::parseLimit($limit);
        $dataAll = self::getAll($sql);
        return count($dataAll) == 1 ? $dataAll[0] : $dataAll;
    }

    /**
     * array(
     * 'username'=>'imoocccc,
     * 'password'=>'imooc222',
     * 'email'=>'imooc111@imooc.com'
     * )
     * update user set username='imoocccc'......where id<=38
     *    order by username limit 3
     */
    /** 更新记录
     * @param $data
     * @param $table
     * @param null $where
     * @param null $order
     * @param null $limit
     * @return bool|int
     */
    public static function update($data, $table, $where = null, $order = null, $limit = null)
    {
        $sets = '';
        foreach ($data as $key => $val) {
            $sets .= $key . "='" . $val . "',";
        }
        //echo $sets;//username='imooc111',password='imooc212',email='imooc222@imooc22.com',
        $sets = rtrim($sets, ',');
        $sql = "UPDATE {$table} SET {$sets} " . self::parseWhere($where) . self::parseOrder($order) . self::parseLimit($limit);
        return self::execute($sql);
    }

    /**
     * 删除记录的操作
     * @param $table
     * @param null $where
     * @param null $order
     * @param int $limit
     * @return bool|int
     */
    public static function delete($table, $where = null, $order = null, $limit = 0)
    {
        $sql = "DELETE FROM {$table} " . self::parseWhere($where) . self::parseOrder($order) . self::parseLimit($limit);
        return self::execute($sql);
    }

    /**
     * 解析where条件
     * @param $where
     * @return string
     */
    public static function parseWhere($where)
    {
        $whereStr = '';
        if (is_string($where) && !empty($where)) {
            $whereStr = $where;
        }
        return empty($whereStr) ? '' : ' WHERE ' . $whereStr;
    }

    /**
     * 添加记录的操作
     * array(
     *  'username'=>'imooc',
     *  'password'=>'imooc',
     *  'email'=>'email'
     * )
     *
     * INSERT user(username,password,email) VALUES('aa','aa','aa@aa.com');
     */
    public static function add($data, $table)
    {
        $keys = array_keys($data);
        array_walk($keys, array('PdoMySQL', 'addSpecilChar'));
        $fieldsStr = join(',', $keys);
        $values = "'" . join("','", array_values($data)) . "'";
        $sql = "INSERT {$table}({$fieldsStr}) VALUES({$values});";
        //echo $sql;
        return self::execute($sql);
    }

    /**
     * 解析group by
     * @param $group
     * @return string
     */
    public static function parseGroup($group)
    {
        $groupStr = '';
        if (is_array($group)) {
            $groupStr .= ' GROUP BY' . implode(',', $group);
        } else if (is_string($group) && !empty($group)) {
            $groupStr .= ' GROUP BY ' . $group;
        }
        return empty($groupStr) ? '' : $groupStr;
    }

    /**
     * 对分组结果通过Having子句进行二次删选
     * @param $having
     * @return string
     */
    public static function parseHaving($having)
    {
        $havingStr = '';
        if (is_string($having) && !empty($having)) {
            $havingStr .= ' HAVING ' . $having;
        }
        return $havingStr;
    }

    /**
     * 解析order by
     * @param $order
     * @return mixed
     */
    public static function parseOrder($order)
    {
        $orderStr = '';
        if (is_array($order)) {
            $orderStr = ' ORDER BY ' . join(',', $order);
        } elseif (is_string($order) && !empty($order)) {
            $orderStr .= ' ORDER BY ' . $order;
        }
        return $orderStr;
    }

    /**
     * 解析显示显示条件
     * limit 3
     * limit 0,3
     * @param $limit
     * @return string
     */
    public static function parseLimit($limit)
    {
        $limitStr = '';
        if (is_array($limit)) {
            if (count($limit) > 1) {
                $limitStr .= ' LIMIT ' . $limit[0] . ',' . $limit[1];
            } else {
                $limitStr .= ' LIMIT ' . $limit[0];
            }
        } elseif (is_string($limit) && !empty($limit)) {
            $limitStr .= ' LIMIT ' . $limit;
        }
        return $limitStr;
    }


    /**
     * 解析字段
     * @param $fields
     * @return string
     */
    public static function parseFields($fields)
    {
        if (is_array($fields)) {
            array_walk($fields, array('PdoMySQL', 'addSpecilChar'));
            $fieldsStr = implode(',', $fields);
        } else if (is_string($fields) && !empty($fields)) {
            if (strpos($fields, '^') === false) {
                //0==false 0:position
                $fields = explode(',', $fields);
                array_walk($fields, array('PdoMySQL', 'addSpecilChar'));
                $fieldsStr = implode(',', $fields);
            } else {
                $fieldsStr = $fields;
            }
        } else {
            $fieldsStr = '*';
        }
        return $fieldsStr;

    }

    /**
     * 通过反引号引用字段
     * @param $value
     */
    public static function addSpecilChar(&$value)
    {
        if ($value == '*' || strpos($value, '.') !== false || strpos($value, '^') !== false) {
            //不用做处理

        } elseif (strpos($value, '^') === false) {
            //$value = '^' . trim($value) . '^';
            $value = '' . trim($value) . '';
        }

    }


    /**执行增删改操作，返回受影响的记录的条数
     * @param null $sql
     * @return bool|int
     */
    public static function execute($sql = null)
    {
        $link = self::$link;
        if (!$link) return false;
        self::$queryStr = $sql;
        if (!empty(self::$PDOStatement)) self::free();
        $result = $link->exec(self::$queryStr);
        self::haveErrorThrowException();
        if ($result) {
            self::$lastInsertId = $link->lastInsertId();
            self::$numRows = $result;
            return self::$numRows;
        } else {
            return false;
        }
    }


    /**
     * 释放结果集
     */
    public static function free()
    {
        self::$PDOStatement = null;
    }

    public static function query($sql = '')
    {
        $link = self::$link;
        if (!$link) return false;
        //判断之前是否有结果集，如果有，释放结果集
        if (!empty(self::$PDOStatement)) self::free();
        self::$queryStr = $sql;
        self::$PDOStatement = $link->prepare(self::$queryStr);
        $res = self::$PDOStatement->execute();
        self::haveErrorThrowException();
        return $res;
    }

    public static function haveErrorThrowException()
    {
        $obj = empty(self::$PDOStatement) ? self::$link : self::$PDOStatement;
        $arrError = $obj->errorInfo();
        /**
         * Array
         * (
         * [0] => 42S02
         * [1] => 1146
         * [2] => Table 'test.user1' doesn't exist
         * )
         */
//        print_r($arrError);
        if ($arrError[0] != '00000') {
            self::$error = 'SQLSTATE ' . $arrError[0] . 'SQL Error: ' . $arrError[2] . '<br/>Error SQL: ' . self::$queryStr;
            self::throw_exception(self::$error);
            return false;
        }
        if (self::$queryStr == '') {
            self::throw_exception('没有执行SQL语句');
            return false;
        }
    }

    /**
     * 自定义错误处理
     * @param $errMsg
     */
    public
    static function throw_exception($errMsg)
    {
        echo '<div style="width:80%;background-color:#ABCDEF;color: black;font-size: 20px;padding: 20px 0px">
        ' . $errMsg . '</div>';
    }

}

require_once 'config.php';
$PdoMySQL = new PdoMYSQL();
$tables = 'user';

var_dump($PdoMySQL::delete($tables, 'id>35'));
//var_dump($PdoMySQL::delete($tables, 'id>3', 'id DESC', '5'));

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