Brief description of PHP entry-level interview questions (1)-PHP Tutorial-php.cn

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

韦小宝

Release： 2023-03-17 15:26:01

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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(&#39;Y-m-d H:i:s&#39;, strtotime(&#39;-1 day&#39;));

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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

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3. Can use HTML and PHP separately Template

smarty, Heyes Template Class, etc.

5. What tools are used for version control?

VS Server on Apache is used as the server, WinCVS is used as the client; Subversion on Apache/DAV is used as the server, TortoiseSVN is used as the client, or Subclipse is used as the client.

6. How to implement string flipping?

strrev()

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7. Methods to optimize MYSQL database.

(1). Select the most applicable field attribute and try to set the field to NOT NULL so that the database does not need to compare NULL values when executing queries in the future.

(2). Use JOIN to replace Sub-Queries

(3). Use UNION to replace manually created temporary tables

(4). Use LIKE keywords and

wildcards as little as possible

(5). Use transactions and foreign keys

##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)

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

mb_substr()

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Don’t be anxious after reading the above interview questions. There are other interview questions. It is best to consolidate the basic things to help us interview and find jobs. .

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