php數(shù)據(jù)類型

This section contains Aptitude Questions and Answers on PHP Data Types.

本節(jié)包含有關(guān)PHP數(shù)據(jù)類型的 Aptitude問題和解答。

1) There are the following statements that are given below, which of them are correct about data types in PHP?

In PHP, variables can store different type of data that is allowed according to PHP data-types.

In PHP, there is no need to use special keywords to specify the data type of variable.

In PHP, we use the 'int' keyword to declare an integer type variable.

We use predefined classes to specify data-types in PHP.

Options:

Only A

Only B

A and B

C and D

Answer & Explanation

Correct answer: 3
A and B

Statements A and B are correct about data-types in PHP.

1)下面給出了以下語句，其中哪些對于PHP中的數(shù)據(jù)類型是正確的？

在PHP中，變量可以存儲根據(jù)PHP數(shù)據(jù)類型允許的不同類型的數(shù)據(jù)。

在PHP中，無需使用特殊關(guān)鍵字來指定變量的數(shù)據(jù)類型。

在PHP中，我們使用'int'關(guān)鍵字聲明一個(gè)整數(shù)類型變量。

我們使用預(yù)定義的類來指定PHP中的數(shù)據(jù)類型。

選項(xiàng)：

只有一個(gè)

只有B

A和B

C和D

答案與解釋

正確答案：3
A和B

語句A和B關(guān)于PHP中的數(shù)據(jù)類型是正確的。

2) There are the following data types that are given below, which of them are supported by PHP?

String

Array

Object

Resource

Options:

A and B

C and D

A, B, and C

A, B, C, and D

Answer & Explanation

Correct answer: 4
A, B, C, and D

All given data-types are supported by PHP.

2)下面提供了以下數(shù)據(jù)類型，PHP支持哪些數(shù)據(jù)類型？

串

數(shù)組

目的

資源資源

選項(xiàng)：

A和B

C和D

A，B和C

A，B，C和D

答案與解釋

正確答案：4
A，B，C和D

PHP支持所有給定的數(shù)據(jù)類型。

3) Which of the following is the correct range of integer variable in PHP?

-32768 to 32767

-2,147,483,648 to 2,147,483,647

-128 to 127

None of the above

Answer & Explanation

Correct answer: 2
-2,147,483,648 to 2,147,483,647

In PHP we used 4-bytes integer then its range is from -2,147,483,648 to 2,147,483,647.

3)以下哪個(gè)是PHP中整數(shù)變量的正確范圍？

-32768至32767

-2,147,483,648至2,147,483,647

-128至127

以上都不是

答案與解釋

正確答案：2
-2,147,483,648至2,147,483,647

在PHP中，我們使用4字節(jié)整數(shù)，則其范圍是-2,147,483,648至2,147,483,647。

4) Which of following function is used to return data type of a variable and its value?

get_type()

var_type()

var_dump()

getType()

Answer & Explanation

Correct answer: 3
var_dump()

The var_dump() function returns data-type of a variable and its value.

4)以下哪個(gè)函數(shù)用于返回變量的數(shù)據(jù)類型及其值？

get_type()

var_type()

var_dump()

getType()

答案與解釋

正確答案：3
var_dump()

var_dump()函數(shù)返回變量的數(shù)據(jù)類型及其值。

5) What is correct output of given code snippets in PHP? <?php $num = 256;var_dump(num); ?>

int(256)

integer(256)

string(3) "num"

None of the above

Answer & Explanation

Correct answer: 3
string(3) "num"

The above code will print a string(3) "num" on the webpage because we did not use the $ symbol with variable name in var_dump() function.

5)PHP中給定代碼段的正確輸出是什么？

整數(shù)(256)

整數(shù)(256)

string(3)“ num”

以上都不是

答案與解釋

正確答案：3
string(3)“ num”

上面的代碼將在網(wǎng)頁上打印一個(gè)string(3)“ num” ，因?yàn)樵趘ar_dump()函數(shù)中我們沒有在變量名中使用$符號。

6) What is correct output of given code snippets in PHP? <?php $num = 256;var_dump($num); ?>

int(256)

integer(256)

string(3) "num"

None of the above

Answer & Explanation

Correct answer: 1
int(256)

The above code will print "int(256)" on the web page.

6)PHP中給定代碼段的正確輸出是什么？

整數(shù)(256)

整數(shù)(256)

string(3)“ num”

以上都不是

答案與解釋

正確答案：1
整數(shù)(256)

上面的代碼將在網(wǎng)頁上打印“ int(256)” 。

7) What is correct output of given code snippets in PHP? <?php $num = 256;$num1 = var_dump($num);echo "num1 is ".$num1; ?>

int(256) num1 is int(256)

int(256) num1 is

Syntax error

None of the above

Answer & Explanation

Correct answer: 2
int(256) num1 is

The above code will print "int(256) num1 is" on the webpage.

7)PHP中給定代碼段的正確輸出是什么？

int(256)num1是int(256)

int(256)num1是

語法錯誤

以上都不是

答案與解釋

正確答案：2
int(256)num1是

上面的代碼將在網(wǎng)頁上打印“ int(256)num1 is” 。

8) What is correct output of given code snippets in PHP? <?php $num = "Hello";var_dump($num); ?>

string(hello)

string("hello")

string(5) "hello"

None of the above

Answer & Explanation

Correct answer: 3
string(5) "hello"

The above code will print [string(5) "hello"] on the web page.

8)PHP中給定代碼段的正確輸出是什么？

字符串(你好)

字符串(“ hello”)

string(5)“你好”

以上都不是

答案與解釋

正確答案：3
string(5)“你好”

上面的代碼將在網(wǎng)頁上打印[string(5)“ hello”]。

9) What is correct output of given code snippets in PHP? <?php $num = 256;var_dump($num);$num = "Hello";var_dump($num); ?>

int(256)

int(256) string(5) "Hello"

int(256) string(3)

syntax error

Answer & Explanation

Correct answer: 2
int(256) string(5) "Hello"

The above code will print [int(256) string(5) "Hello"] on the web page.

9)PHP中給定代碼段的正確輸出是什么？

整數(shù)(256)

int(256)字符串(5)“你好”

int(256)字符串(3)

語法錯誤

答案與解釋

正確答案：2
int(256)字符串(5)“你好”

上面的代碼將在網(wǎng)頁上打印[int(256)string(5)“ Hello”]。

10) What is correct output of given code snippets in PHP? <?php $num = true;var_dump($num); ?>

bool(true)

boolean(true)

bool(4) "true"

boolean(4) "true"

Answer & Explanation

Correct answer: 1
bool(true)

The above code will print "bool(true)" on the web page.

10)PHP中給定代碼段的正確輸出是什么？

布爾值(true)

布爾值(true)

bool(4)“真”

boolean(4)“ true”

答案與解釋

正確答案：1
布爾值(true)

上面的代碼將在網(wǎng)頁上打印“ bool(true)”。

11) What is correct output of given code snippets in PHP? <?php $usrArray = array("ABC","PQR","XYZ");var_dump($usrArray); ?>

array(3) string

array(3) { [0]=> string(3) "ABC" [1]=> string(3) "PQR" [2]=> string(3) "XYZ" }

Syntax error

None of the above

Answer & Explanation

Correct answer: 2
array(3) { [0]=> string(3) "ABC" [1]=> string(3) "PQR" [2]=> string(3) "XYZ" }

11)PHP中給定代碼段的正確輸出是什么？

array(3)字符串

array(3){[0] =>字符串(3)“ ABC” [1] =>字符串(3)“ PQR” [2] =>字符串(3)“ XYZ”}

語法錯誤

以上都不是

答案與解釋

正確答案：2
array(3){[0] =>字符串(3)“ ABC” [1] =>字符串(3)“ PQR” [2] =>字符串(3)“ XYZ”}

12) What is correct output of given code snippets in PHP? <?php $usrArray = array("ABC",786,"XYZ");var_dump($usrArray); ?>

array(3) { [0]=> string(3) "ABC" [1]=> string(3) 786 [2]=> string(3) "XYZ" }

array(3) { [0]=> string(3) "ABC" [1]=> int(786) [2]=> string(3) "XYZ" }

Syntax error

None of the above

Answer & Explanation

Correct answer: 2
array(3) { [0]=> string(3) "ABC" [1]=> int(786) [2]=> string(3) "XYZ" }

12)PHP中給定代碼段的正確輸出是什么？

array(3){[0] =>字符串(3)“ ABC” [1] =>字符串(3)786 [2] =>字符串(3)“ XYZ”}

array(3){[0] =>字符串(3)“ ABC” [1] => int(786)[2] =>字符串(3)“ XYZ”}

語法錯誤

以上都不是

答案與解釋

正確答案：2
array(3){[0] =>字符串(3)“ ABC” [1] => int(786)[2] =>字符串(3)“ XYZ”}

13) In PHP, NULL is a data type?

Yes

No

Answer & Explanation

Correct answer: 1
Yes

In PHP, NULL is also data-type which can have only one value null.

13)在PHP中，NULL是數(shù)據(jù)類型嗎？

是

沒有

答案與解釋

正確答案：1
是

在PHP中，NULL也是數(shù)據(jù)類型，只能有一個(gè)值null。

14) What is correct output of given code snippets in PHP? <?php$x = null;var_dump($x); ?>

NULL

NULL(4)

NULL(null)

None of the above

Answer & Explanation

Correct answer: 1
NULL

The above code will print NULL on the webpage.

14)PHP中給定代碼段的正確輸出是什么？

空值

空(4)

NULL(空)

以上都不是

答案與解釋

正確答案：1
空值

上面的代碼將在網(wǎng)頁上顯示NULL。

15) Can we create a user-defined class in the PHP script?

Yes

No

Answer & Explanation

Correct answer: 1
Yes

Yes, we can create a user-defined class in the PHP script.

15)我們可以在PHP腳本中創(chuàng)建用戶定義的類嗎？

是

沒有

答案與解釋

正確答案：1
是

是的，我們可以在PHP腳本中創(chuàng)建一個(gè)用戶定義的類。

16) There are the following statements that are given below, which of them are correct about resource type in PHP?

The resource type is used to contain the reference to the function.

The resource type is used to store the reference of external resources.

The resource type is used for the database call.

None of the above

Options:

A and B

B and C

A, B, and C

D

Answer & Explanation

Correct answer: 3
A, B, and C

Statements A, B, and C are correct about resource type in PHP.

16)下面給出了以下語句，其中哪些對PHP中的資源類型是正確的？

資源類型用于包含對該函數(shù)的引用。

資源類型用于存儲外部資源的引用。

資源類型用于數(shù)據(jù)庫調(diào)用。

以上都不是

選項(xiàng)：

A和B

B和C

A，B和C

d

答案與解釋

正確答案：3
A，B和C

關(guān)于PHP中的資源類型，語句A，B和C是正確的。

17) What is the correct output of given code snippets in PHP? <?phpclass Sample {function Sample() {$Var1 = "India";}}// create an object of Sample class$obj = new Sample();echo $obj->$Var1; ?>

India

Error

Answer & Explanation

Correct answer: 2
Error

The above code will generate an error because $Var1 is not a member of the Sample class.

17)PHP中給定代碼段的正確輸出是什么？

印度

錯誤

答案與解釋

正確答案：2
錯誤

上面的代碼將產(chǎn)生錯誤，因?yàn)? Var1不是Sample類的成員。

18) What is the correct output of given code snippets in PHP? <?phpclass Sample {function Sample() {$this->$Var1 = "India";}}// create an object of Sample class$obj = new Sample();echo $obj->$Var1; ?>

India

Error

Answer & Explanation

Correct answer: 1
India

The above code will generate print "India" on the web page.

18)PHP中給定代碼段的正確輸出是什么？

印度

錯誤

答案與解釋

正確答案：1
印度

上面的代碼將在網(wǎng)頁上生成打印“印度”。

19) What is the correct output of given code snippets in PHP? <?phpclass Sample {function Sample() {$this->$Var2 = "Australia";$this->$Var1 = "India";}}// create an object of Sample class$obj = new Sample();var_dump($obj); ?>

object(Sample)#1 (1) { [""]=> string(5) "India" }

object(Sample)#1 (2) { [""]=> string(5) "Australia" }

Error

None of the above

Answer & Explanation

Correct answer: 1
object(Sample)#1 (1) { [""]=> string(5) "India" }

19)PHP中給定代碼段的正確輸出是什么？

object(Sample)＃1(1){[“”] => string(5)“ India”}

object(Sample)＃1(2){[“”] => string(5)“ Australia”}

錯誤

以上都不是

答案與解釋

正確答案：1
object(Sample)＃1(1){[“”] => string(5)“ India”}

翻譯自: https://www.includehelp.com/php/data-types-aptitude-questions-and-answers.aspx

php數(shù)據(jù)類型

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