PHP basic question and answer knowledge summary sharing

B.3

C.6

D."33+4+5";

09 .The following code returns TRUE after adding the following function:

Return ?=='A';

A.ord(65) According to the character, returns the ascii code value

B.chr(65)According to the asciicode value, return the corresponding character A==65 a==97

C.65+''

D.''+65

10. The correct output of the following code is:

$a= array(1=>5,5=>8,22,2=>'8',81);

Echo $a[7];//81

Echo $a[6];//22

Echo $a[3];

?>

A. Empty 2281 B. Empty 8122C. 8122 EmptyD. Empty Empty Empty

11. The output of the following code:

$a[bar] ='hello';

Echo $a[bar];//hello

echo $a['bar'];//hello

?>

A.hello B. Empty C. ErrorD.hellohello

*12. Write the result of the following code:

Echo 1>>0; 0001

Echo 2>>1; 0010 -> 0001

Echo 3<<2; 0011 -> 1100

?>

A.012 B.106C.1112D.123

13 .The following description of echo and print is correct:

A. Both echo and print can print multiple parameters

B. Print can print multiple parameters, but echo cannot

C.echocan print multiple parameters,printcannot

D. Echo and print cannot print multiple parameters

14. For the following code

$fruits= array('strawberry'=>'red','banana'=>'yellow');

?>

The code that can correctly get the result 'yellow' is:

A.echo"A banana is {$fruits['banana']}";

B.echo"A banana is $fruits['banana']" ;

C.echo"A banana is {$fruits[banana]}";

D.echo"A banana is $fruits[banana]";

15. What is the result after the following code is executed?

Function change(){

Static$i=0;

$i++;

Return$ i;

}

using using through ’’s way through ’ through ’ s through ’’s ’ through through through ‐ through ‐ through ‐ through through through through through through through‐‐ to to the right to print to. 12

$ srcArray = array('a','b','c','d'); ;

Is_string()Return valueA , a

B,falseC. trueb

17. What is the output?A. 3B. false

D

、

1

## A. 1

C. 3D. 4

E. 5

19. Are php function names case-sensitive?

, not sensitive

B. Distinguish

20. After the following code is executed, the $result value is:

$x=””;

$result=is_null($x);

?>

A. null

B. true

C、false

D、1

21 .Which OOP setup pattern allows a class to be instantiated only once for the entire script?

A. MVC

B. Proxy pattern

C. State pattern

D. Abstract factory pattern

E, Singleton Mode

22. With the help of inheritance, we can create derived classes of other classes. So in PHP, how many parent classes can a subclass inherit at most?

A. 1

B. 2

C. Depends on system resources

D. 3

E. As many as you want

23. Which of the following error types cannot be caught by a custom error handler? ( Double selection) set_error_handler

A. E_WARNING

B、E_USER_ERROR

C、E_PARSE

D、E_NOTICE

24. Execute the following code, the output result is

Abstract class a{

Function __construct(){

Echo “a”;

}

}

$a=new a();

?>

A. a

B. An error warning

C. A fatal error

25. Execute The following code, the input result is

# & LT;? PHP

Class a {

Function __ConStruct () {

## Echo "echo classb appearance";

, echoclassbsomethingechoclassasomething

C. echoclassassomething

26. Which of the following options does not add john to the users array? 2 points(A) $users[] = 'john';(B) array_push($users, 'john');

$users||= 'john';

(D) array_unshift($users, 'john');

27. In PHP, the function of the '+' operator does not include 2 pointsA. String concatenation

B. Array data merging array(0=> ;1,1=>2)+array(2=>3,3=>4)

C. Addition of variable data

28. Which of the following expressions cannot concatenate two strings $s1 and $s2 into a single string? ( )

B. "{$s1}{$s2}" C.$s1.$s2

D. implode(' ',array($s1,$s2)) E. All the above methods can be implemented

29. After the following script is run, what is the value contained in the $array array? ( )

$array = array('1','1');foreach($array as $k=>$v){

$v = 2;

}

A.array('2','2')

'1')C.array(2, 2) D.array(Null,Null)30.What is the function of array_shift() function?A Add an element to the arrayB

C Exchange an array The key and value

D Clear an arrayFill in the blanks

1. Execution program segment will output___0_.

*2. To install PHP as an Apache module, first use the statement__

__ dynamically loads the PHP module, and then uses the statement__AddTypeapplication/x-httpd-php .php__ to cause Apache to process all files with the extension php as PHP scripts .

3. The attributes of the class can be serialized and saved in the session, so that the entire class can be restored later. The function used is _serialize___.

4, __debug_backtrace___ function can return the name of the function called in any line in the script. This function is also often used in debugging to determine how the error occurred.

5. ok"; $cd .= "ok";

echo$cd; echo $cd;

?>

The output of this code is ___

____

1, (5 points) Please point out the errors in the following code (circle them and correct them)

function baz($y

,

$a) {/$x =new Array();xas $key =

>

$value) {

echo$key + “ ” + $value + “
”;

;　$c=40;use with --

10

$var1 = 5;$var2 = 10;

//8

5. Write the output of the following code:

function myfunc($argument){

echo $argunment + 10;

}

$variable =10;

echo “myfunc($variable)=".myfunc($variable);

20myfunc(10)=

6. Write the output result of the following program (5 points)

$test='aaaaaa';

$abc=&$test;

unset($test);

echo $abc;//aaaaaa

7. Write the result of running the program

$a=0;

$b=0;

If($a=3||$b=3){

$a++; //true++

$b++; //0++

}

Echo$a.”,”.$b;//1,1

#Results: 1._______1,1__________, 2._______4,4____________8、

< ;?php

.

Questions and Answers

mb_substr()

##$str = “helloworld”.$str;

##File_put_contents ("hello.txt",$str);

For 

can loop through all arrays

Whilesimilar tofor

##While (list($key,$val)=each($arr))Poor readability, low efficiency

(Strtotime( '2007-3-6')-Strtotime("2007-2-5"))/(3600*24)

##for($j=0,$c=count($array);$ j<$c;$j++){

## If(strlen($array[$i]['name'])>strlen($array[$i+1]['name'] )){

## array[$i]= $array[$i+1];

## $array[$i+1]= $tmp;

through # $array[$c-1-$j]['id']= $c-$j;

##$arr = array();foreach($Tarray as $k=>$v)

$arr[$k] = strlen( $v['name']);}natsort($arr);$arr1 = array();$i = 0;

{using using - 'name'];$i++;}

8. What is the function of error_reporting in PHP? (1 point)

Change the error level

$_SERVER['REQUEST_URI']



10. Between mysql_fetch_row() and mysql_fetch_array What's the difference? (1 point)



Mysql_fetch_row()

Returns the index array

Mysql_fetch_array()

Returns an array with index and association

11. What is the GD library used for? (1 point)

Dynamicly generated images

12. Please explain the difference between passing by value and passing by reference in PHP. When to pass by value and when to pass by reference? (2 points)

Pass by value: Only the value will be passed to a variable

Passing address: The address will be passed to a variable. At this time, both variables point to the same address at the same time. If one changes, the other will also change.

13. Talk about the advantages and disadvantages of asp, php, jsp (1 point)

Asp.netAdvantages: Faster development,B/S,C/S

##Asp.netDisadvantages: Platform limitations (windows-IIS), high cost

##PHPAdvantages: cross-platform, high development efficiency, open source

PHPDisadvantages: Cannot doC/Smode software (for example:QQ)

JSPAdvantages : Wider coverage (C/S,B/S), safer

JSPDisadvantages: Not open source, not free, high cost

14. Use PHP to write the code to display the client IP and server IP 1 point)

$_SERVER['REMOTE_ADDR']

$_SERVER['SERVER_ADDR']

15. What is the difference between margin and paddin in CSS? Write down the direction of the parameters when padding has three parameters and four parameters.

Margin:1px 2px 3px

Margin:1px 2px 3px 4px16. In the development project, If you need to upload a file exceeding 8M, please describe the configuration items that need to be modified in php.ini. (10 points)

upload_max_filesize upload_max_filesize

Injection, preprocessing

index.php?id=1

can be received

##}

22. Use PHP to write a code that does not use the third variable, exchanges the values of $a, $b, and sets the initial values of $a, $b yourself.

$a = array($a,$b)

$b = $a[0];

$a = $a[1]

23. The difference between interface and abstract class in object-oriented and application scenarios

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