Brief description of PHP entry-level interview questions (1)

PHP Junior Interview Questions are for programmers with little experience who are just looking for a job. This provides a lot of help for us to go out for interview, InterviewOfficial meetings often test us, and the interview questions played a big role at this time.

1. Use PHP to print out the time of the previous day in the format of 2006-5-10 22:21:21

echo date('Y-m-d H:i:s', strtotime('-1 day'));

2. The difference between echo(), print() and print_r()

echo is a PHP statement, print and print_r are functions, statements have no return value, and functions can There is a return value (even if it is useless)
##

print //只能打印出简单类型变量的值(如int,string) 
print_r //可以打印出复杂类型变量的值(如数组,对象) 
echo  //输出一个或者多个字符串

3. Can use HTML and PHP separately Template

5. What tools are used for version control?

6. How to implement string flipping?

strrev()

7. Methods to optimize MYSQL database.

wildcards as little as possible

##8, PHP MeaningHypertext Preprocessor

9. What is the function for getting the current time in MYSQL?, and the function for formatting the date is

now()
DATE_FORMAT(date,format)

10. A method to intercept Chinese text strings without garbled characters.

mb_substr()

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