Programmer Think

catalogue 1, What is an arbitrary code execution vulnerability 2, Harm of vulnerability 3, Arbitrary Code Execution Vulnerability 1. Exploit of eval() function Exploit function (1 EVAL)_ one 1.2 exploit of eval() function_ two 1.3. Exploit of eval() function_ three 1.4preg_replace+/e utilization 2.assert() function 3.preg_replace(); ...

character string Basic knowledge Definitions and related concepts 1. Linked list and diagram Single linked list: one data field + one pointer field Tree: one data field + multiple pointer fields Figure: vertex set + edge Tree: acyclic connected graph is a special kind of graph. 2. Definition of tree A tree is a finite set of N (N &gt ...

catalogue environment prepare install Configuration after installation Deployment NET 6 program summary   K8s is a foundation for learning cloud native. In order to do some experiments, stand-alone deployment is the most convenient. The following will introduce the stand-alone installation of k8s in CentOS NET 6 Program published t ...

day8 dictionary I Cognitive dictionary Dictionary and list selection: When you need to save multiple data at the same time, use the list if the meaning of multiple data is the same (there is no need to distinguish); If multiple data have different meanings, use a dictionary Cognitive Dictionary (dict) """ 1) Is a container data type; take{ ...

day8 dictionary 1. Recognize the dictionary 1. Dictionary and list selection: When you need to save multiple data at the same time, use the list if the meaning of multiple data is the same (there is no need to distinguish); If multiple data have different meanings, use a dictionary 2. Cognitive Dictionary (dict) 1) Is a container data type ...

review Conditional operator Expression 1? Expression 2: expression 3 Expression 1 is true and the result is the result of expression 2; Otherwise, it is the result of expression 3. sizeof() operator The memory length of calculation types and variables, in bytes int 4 char 1 float 4 short 2 double 8 ++Self increasing -- self decreasin ...

review Use of vim editor: vi file name vi test. c . C language source file Key i: enter the input mode and insert appears in the lower left corner esc key: exit the input mode. The insert in the lower left corner is gone : wq save and exit vi editor :q! Force exit without saving :wq! Force save exit #include <stdio.h> //#Prepr ...

1. Concept introduction In order structure and balance tree, there is no corresponding relationship between element key and its storage location. Therefore, when looking for an element, it must be compared many times by key. It depends on the complexity of the search tree (n), that is, the search efficiency is the balance of the search tre ...

Dao interface proxy 1. Introduction to agent development mode The agent development mode of Mybatis is adopted to realize the development of DAO layer, which is the mainstream of entering the enterprise later. Mapper interface development method only requires programmers to write mapper interface (equivalent to Dao interface). Mybatis framew ...

How do programmers protect themselves? background Nearly 600000 people in China die suddenly from heart disease every year, most of them young people under the age of 35. 90%Sudden death, cerebral hemorrhage and myocardial infarction are all related to high work pressure, staying up late and bad living habits. Common inducements include neg ...