如何知道 PHP 中异常来自的行号

Question

我即将完成一个项目，但我注意到 error_log 文件中出现错误。我在加载 index.php 文件时遇到此错误，并且在一次重新加载中我收到了 21 行错误代码。

我试过从 header.php 文件进行调试。最疯狂的事情是在我加载 header.php 文件之前没有得到任何错误，但是当我在 index.php 文件中调用 header.php 时我得到了错误。所以我试图通过 PDO 的 try 和 catch 来捕获错误。在错误日志文件中，我收到错误消息，因此我将代码从 Select Query: ".$e->getMessage() 更改为 Select Query: ".$e->getFile() 和 Select Query: ".$e->getLine()。但是，这样做我得到了错误所在的行号，而不是它被抛出的行。

我想我在 databse.php 中的 select 查询有问题。以下是我的 select 查询代码：

final protected function select($args = array(), $is_die = false){
            try {

        $this->sql = "SELECT ";
        if (isset($args['fields'])) {
            if (is_array($args['fields'])) {
                $this->sql .= implode(', ', $args['fields']);
            } else {
                $this->sql .= $args['fields'];
            }
        } else {
            $this->sql .= " * ";
        }
        $this->sql .= " FROM ";
        if (!isset($this->table) || empty($this->table)) {
            throw new Exception("Table not set");
        }
        $this->sql .= $this->table;

        /*Join Query*/
        if (isset($args['join']) && !empty($args['join'])) {
            $this->sql .= " ".$args['join'];
        }
        /*Join Query*/

        if (isset($args['where']) && !empty($args['where'])) {
            if (is_array($args['where'])) {
                $temp = array();
                foreach ($args['where'] as $column_name => $data) {
                    if (!is_array($data)) {
                        $data = array(
                            'value'     => $data,
                            'operator'  => '=',
                        );
                    }
                    $str = $column_name.' '.$data['operator'].' :'.str_replace('.', '_', $column_name);
                    $temp[] = $str;
                }
                $this->sql .= " WHERE ".implode(' AND ', $temp);
            } else {
                $this->sql .= " WHERE ".$args['where'];
            }
        }

        /*Group*/
        if (isset($args['group_by']) && !empty($args['group_by'])) {
            $this->sql .= " GROUP BY ".$args['group_by'];
        }
        /*Group*/

        /*Order*/
        if (isset($args['order_by']) && !empty($args['order_by'])) {
            $this->sql .= " ORDER BY ".$args['order_by'];
        } else {
            $this->sql .= " ORDER BY ".$this->table.".id DESC";
        }
        /*Order*/

        /*Limit*/
        if (isset($args['limit']) && !empty($args['limit'])) {
            if (is_array($args['limit'])) {
                $this->sql .= " LIMIT ".$args['limit'][0].",".$args['limit'][1];
            } else {
                $this->sql .= " LIMIT ".$args['limit'];
            }
        }
        /*Limit*/
        $this->stmt = $this->conn->prepare($this->sql);
        if (is_array($args['where']) || is_object($args['where'])){

            foreach ($args['where'] as $column_name => $data) {
            $value = is_array($data) ? $data['value'] : $data; //check if passed where statement was an array, fetch value if so
            if (is_int($value)) {
                $param = PDO::PARAM_INT;
            }elseif (is_bool($value)) {
                $param = PDO::PARAM_BOOL;
            }elseif (is_null($value)) {
                $param = PDO::PARAM_NULL;
            }else {
                $param = PDO::PARAM_STR;
            }
            if ($param) {
                $this->stmt->bindValue(":".str_replace('.', '_', $column_name), $value, $param);
            }
        }

        }

        if ($is_die) {
            echo $this->sql;
            debugger($this->stmt);
            debugger($args, true);
        }

        $this->stmt->execute();
        $data = $this->stmt->fetchAll(PDO::FETCH_OBJ);
        return $data;
        } catch (PDOException $e) {

                error_log(
                    date('Y-m-d h:i:s A').", Select Query: ".$e->getMessage()."\r\n"
                    , 3, ERROR_PATH.'/error.log');
                return false;
            } catch (Exception $e) {
                error_log(
                    date('Y-m-d h:i:s A').", General: ".$e->getMessage()."\r\n"
                    , 3, ERROR_PATH.'/error.log');
                return false;
            }
    }

是否有可能使用 try catch 或任何其他方式获取抛出错误的文件的行号？

Answer 1

可以使用try、catch获取异常，行号使用__LINE__

例如

try {
  /* Your Code */
} catch (Exception $e) {
   echo __LINE__.$e->getMessage() "\n";
}

在你的代码里面的 catch 状态

"Line No : " __LINE__.date('Y-m-d h:i:s A')

使用下面的行号和文件路径

"Line No : " __LINE__." : File Path : ".__FILE__.date('Y-m-d h:i:s A')

Answer 2

我刚刚粘贴代码以在我的 select 查询中获取行号和函数名称。

代码如下：

Exception("MySQL error $mysqli->error <br> Query:<br> $sql", $msqli->errno);

添加以上代码行后，select 查询将如下所示：

final protected function select($args = array(), $is_die = false){
        try {

    $this->sql = "SELECT ";
    if (isset($args['fields'])) {
        if (is_array($args['fields'])) {
            $this->sql .= implode(', ', $args['fields']);
        } else {
            $this->sql .= $args['fields'];
        }
    } else {
        $this->sql .= " * ";
    }
    $this->sql .= " FROM ";
    if (!isset($this->table) || empty($this->table)) {
        throw new Exception("Table not set");
    }
    $this->sql .= $this->table;

    /*Join Query*/
    if (isset($args['join']) && !empty($args['join'])) {
        $this->sql .= " ".$args['join'];
    }
    /*Join Query*/

    if (isset($args['where']) && !empty($args['where'])) {
        if (is_array($args['where'])) {
            $temp = array();
            foreach ($args['where'] as $column_name => $data) {
                if (!is_array($data)) {
                    $data = array(
                        'value'     => $data,
                        'operator'  => '=',
                    );
                }
                $str = $column_name.' '.$data['operator'].' :'.str_replace('.', '_', $column_name);
                $temp[] = $str;
            }
            $this->sql .= " WHERE ".implode(' AND ', $temp);
        } else {
            $this->sql .= " WHERE ".$args['where'];
        }
    }

    /*Group*/
    if (isset($args['group_by']) && !empty($args['group_by'])) {
        $this->sql .= " GROUP BY ".$args['group_by'];
    }
    /*Group*/

    /*Order*/
    if (isset($args['order_by']) && !empty($args['order_by'])) {
        $this->sql .= " ORDER BY ".$args['order_by'];
    } else {
        $this->sql .= " ORDER BY ".$this->table.".id DESC";
    }
    /*Order*/

    /*Limit*/
    if (isset($args['limit']) && !empty($args['limit'])) {
        if (is_array($args['limit'])) {
            $this->sql .= " LIMIT ".$args['limit'][0].",".$args['limit'][1];
        } else {
            $this->sql .= " LIMIT ".$args['limit'];
        }
    }
    /*Limit*/
    $this->stmt = $this->conn->prepare($this->sql);
    if (is_array($args['where']) || is_object($args['where'])){

        foreach ($args['where'] as $column_name => $data) {
        $value = is_array($data) ? $data['value'] : $data; //check if passed where statement was an array, fetch value if so
        if (is_int($value)) {
            $param = PDO::PARAM_INT;
        }elseif (is_bool($value)) {
            $param = PDO::PARAM_BOOL;
        }elseif (is_null($value)) {
            $param = PDO::PARAM_NULL;
        }else {
            $param = PDO::PARAM_STR;
        }
        if ($param) {
            $this->stmt->bindValue(":".str_replace('.', '_', $column_name), $value, $param);
        }
    }

    }

    if ($is_die) {
        echo $this->sql;
        debugger($this->stmt);
        debugger($args, true);
    }

    $this->stmt->execute();
    $data = $this->stmt->fetchAll(PDO::FETCH_OBJ);
    return $data;
    } catch (PDOException $e) {

            error_log(
                date('Y-m-d h:i:s A').", Select Query: ".$e->getMessage()."\r\n"
                , 3, ERROR_PATH.'/error.log');
            return false;
        } catch (Exception $e) {
            error_log(
                date('Y-m-d h:i:s A').", General: ".$e->getMessage()."\r\n"
                , 3, ERROR_PATH.'/error.log');
                Exception("MySQL error $mysqli->error <br> Query:<br> $sql", $msqli->errno);
            return false;
        }
}

更多信息，程序员可以访问这个link：PHP Manual

如何知道 PHP 中异常来自的行号

How to know the line number from where the exception is coming from in PHP

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