Summary of Teacher Shen Yi's special PHP training notes

If you use eval() in your current code, remember the mantra "eval() is the devil". This method accepts any string and processes it as JavaScript code. When the code in question is known in advance (not determined at runtime), there is no reason to use eval(). If the code is generated dynamically at runtime, there is a better way to achieve the same goal without using eval. For example, it would be better and simpler to access dynamic properties using square bracket notation: // Negative example var property = "name"; alert(eval("obj." + property)); ​ // better one var property = "name"; alert(obj[property]); Using eval() also brings security risks, because the executed code (for example

1. JavaScript Exploration: eval() is the "devil"

Introduction: JavaScript Exploration: eval() is the "devil"

2. PHP Devil’s Special Training

Introduction: In this class, the teacher leads us to create TEMPLATE. According to the teacher’s teachings, we hope that A way to write code: 1. For example, I define a variable $name=''; 2. Then I read a template. 3. Then I set some of my own "display formats" in this template. , you can directly replace it with the above variables after loading the template.

##3. Teacher Shen Yi’s PHP Devil Special Training Notes (8)

Introduction: Teacher Shen Yi’s special PHP training notes (8)

4. Teacher Shen Yi’s special PHP training notes (7)--My name is What’s my name

Introduction: Teacher Shen Yi’s PHP devil special training notes (7)--What’s my name

##5.

Teacher Shen Yi’s special PHP training notes (4)

##Introduction: Teacher Shen Yi’s PHP Devil’s Special Training Notes (4)

6.

Teacher Shen Yi’s PHP Devil’s Special Training Notes (5)

## Introduction: Teacher Shen Yi’s special PHP training notes (5)

7. Teacher Shen Yi’s special PHP training notes (3)

Introduction: Teacher Shen Yi’s special PHP training notes (3)

8. Teacher Shen Yi’s special PHP training notes (1)

Introduction: Teacher Shen Yi’s PHP Devil’s Special Training Notes (1)

9. Devil’s Special Training Camp Teacher Shen Yi’s PHP Devil’s Special Training Notes (2)

Introduction: Devil’s Special Training Camp: Devil’s Special Training Camp Teacher Shen Yi’s PHP Devil’s Special Training Notes (2): 1. This lesson You will learn several lazy functions: 1. file_put_contents　　　(PHP 5, PHP 7)　　file_put_contents - Write a string to the file description int file_put_contents (string $filename, mixed $data [, int $flags = 0 [, resource $context ]] )　

10. Teacher Shen Yi’s PHP Devil Special Training Notes (2), Shen Yi Devil_PHP Tutorial

Introduction: Teacher Shen Yi’s PHP Devil Special Training Notes (2), Shen Yi Devil. Teacher Shen Yi’s PHP Devil Special Training Notes (2), Shen Yi Devil 1. In this lesson, you will learn several lazy functions: 1. file_put_contents (PHP 5, PHP 7) file_put_contents writes a string into

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