Brief description of PHP entry-level interview questions (4)

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.

31. What is the GD library used for?

The GD library provides a series of APIs for processing images. You can use the GD library to process images or generate images. On websites, the GD library is usually used to generate thumbnails or to add watermarks to images or to generate reports on website data.

32. Point out some ways to enter a piece of HTML code in PHP.

print("<table></table>");

33. Which of the following functions can open a file for reading and writing? (c)

• (a) fget()

• (b) file_open()

• (c) fopen()

• (d) open_file()

##34 . Which of the following options does not add john to the users array? (c, d)

• (a) $users[] = 'john';

• (b) array_add($users,'john');

• (c) array_push($users,'john');

• (d) $users ||= 'john';

35. Will the following program input?

<?php
$num = 10;
function multiply(){
    $num = $num * 10;
}
multiply();
echo $num;
?>

No , local variables

36. Use PHP to write a simple query to find out all the content named "Zhang San" and print it out

##Name张三张三张四

Tel	Content	Date
13333663366	Graduation from college	2006-10-11
13612312331	Undergraduate Graduation	2006-10-11
021 -55665566	College graduate	2006-10-11

##Please complete the code according to the above question:

$mysql_db=mysql_connect("local","root","pass");

@mysql_select_db("DB",$mysql_db);

$result=mysql_query("select * from User where Name='张三'");

while($row=mysql_fetch_array($result))
{
    echo $row['Name'].$row['Tel'].$row['Content'].$row['Date'];
    echo "<br>";
}

37. How to use the following classes and explain what they mean?

class test{
function Get_test($num){
    $num=md5(md5($num)."En");
    return $num;
    }
}

//使用类
$testObject = new test();
$encryption = $testObject->Get_test("xiaotian_ls");

Double md5 encryption

38. Please write down the meaning of the data type (int char varchar datetime text); What is the difference between varchar and char?

int numerical type

• char fixed length string

• varchar variable length string

• datetime date time type

• text character string

• The length of the char column is fixed to the length declared when creating the table

The value in the varchar column is a variable-length string.

39, MySQ auto-increment type (usually table ID field) must be set to (?) field

AUTO_INCREMENT

40. Write the output result of the following program

<?
$b=201;
$c=40;
$a=$b>$c?4:5;
echo $a; //4
?>

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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