The 11 most frequently asked interview questions and answers in PHP, PHP test questions_PHP tutorial

The 11 most frequently asked interview questions and answers in PHP, PHP test questions

Are you looking for a PHP development job and looking for some PHP interview questions and answers? This article shares with you some of the 11 most frequently asked PHP interview questions, as well as the corresponding common answers. Each company has its own interview standards. The interview and questions completely depend on the role you play in the job. Of course It is also closely related to your programming skills.

Question: Please tell me what PHP is in the simplest language?

Answer: The full name of PHP: Hypertext Preprocessor, is a server scripting language used to develop dynamic websites.

Question: What is MVC?

Answer: MVC consists of Model, View and Controller. PHP MVC can manage PHP code in three different layers more efficiently.

Model: Data information access layer.
View: The view layer is responsible for displaying application data on the interface in a specific way.
Controller: Usually the controller is responsible for reading data from the view, controlling user input, and sending data to the model.

Question: How many ways are there to reference CSS in the page?

Answer: There are 3 ways to use CSS on the page:
Reference external CSS files
Internally defined Style
Inline styles

Question: Does PHP support multiple inheritance?

Answer: No. PHP classes can only inherit from one parent class and are identified with the keyword "extended".

Question: What is the difference between echo and print in PHP?

These two look similar because they both print some values ​​on the screen. But the essential difference between echo and print is that echo is used to output a string, and multiple values ​​can be separated by commas when displaying them. Only basic types are supported. Print can not only print string values, but also print function return values.

Question: What is the difference between GET and POST methods?

Answer: The form information we fill in on the web page can pass the data to the server through these two methods. When we use the GET method, all the information will appear in the URL address, and using the GET method can only It can pass 1024 characters, so you can use the GET method if the transmission volume is small or security is not so important. Speaking of the POST method, up to 2MB bytes of data can be transferred and can be adjusted as needed.

Question: What is the method to get the image size in PHP?

Answer: getimagesize () gets the size of the image
Imagesx () gets the width of the image
Imagesy () gets the height of the image

Question: What is PEAR in PHP?

Answer: PEAR is PHP Extension and Application Repository, which is a code repository for PHP extensions and applications.

Question: How to upload videos using PHP and MySQL?

Answer: We can store the address of the video in the database without storing the real video data in the database. Video data can be stored in a specified folder on the server. The default upload size is 2MB, but we can also change it by modifying the max_file size option in the php.ini file.

Question: What are the error types in PHP?

Answer: There are roughly three types of errors encountered in PHP.

Tips: These are very normal messages, not major errors, and some will not even be displayed to users. For example, access a variable that does not exist.
Warning: This is a serious error. A warning message will be displayed to the user, but it will not affect the output of the code, such as including some non-existent files.
Errors: These are really serious errors, like accessing a non-existent PHP class.

Question: How to define constants in PHP?

Answer: Define () is used in PHP to define constants.

Copy code The code is as follows:

define (“Newconstant”, 30);

Question: How to submit a form without using the submit button?

If we don’t want to use the submit button to submit the form, we can also use a hyperlink to submit. We can write the code like this:

Copy code The code is as follows:

Submit Me

PHP programmer computer interview questions (with answers, bonus points for good answers)

PHP interview questions from a large company

Management reminder: This post was unpinned by haowubai (2009-07-30)
1. How to use PHP environment variables to get a web page address content? How to get the ip address?
[php]
echo $_SERVER ['PHP_SELF'];
echo $_SERVER ['SERVER_ADDR'];
[/php]

2. Find the two dates Difference, such as the date difference from 2007-2-5 ~ 2007-3-6
[php]
$begin=strtotime('2007-2-5');
$end=strtotime( '2007-3-6');
echo ($end-$begin)/(24*3600);
[/php]

3. Please write a function to implement the following functions :
The string "open_door" is converted into "OpenDoor", "make_by_id" is converted into "MakeById".
[php]
function changeStyle(& $str) {

/*$str = str_replace ( "_", " ", $str );
$str = ucwords ( $ str );
$str = str_replace ( " ", "", $str );
return $str;*/

$arrStr=explode('_',$str);
foreach($arrStr as $key=>$value){
$arrStr[$key]=strtoupper(substr($value,0,1)).substr($value,1);
}
return implode('',$arrStr);
}
$s = "open_door";
echo changeStyle ( $s );
[/php]

4. It is required to write a program to convert the following array $arr1 into array $arr2:
[php]$arr1 = array (
'0' => array ('fid' => 1, ' tid' => 1, 'name' =>'Name1' ),
'1' => array ('fid' => 1, 'tid' => 2 , 'name' => ;'Name2' ),
'2' => array ('fid' => 1, 'tid' => 5 , 'name' =>'Name3' ),
'3' => array ('fid' => 1, 'tid' => 7 , 'name' =>'Name4' ),
'4' => array ('fid' => 3 , 'tid' => 9, 'name' =>'Name5' )
);
$arr2 = array...The rest of the text>>

php interview questions and answers, php written test questions

Principles and Applications of Java Exception Mechanism
Answer: Whenever an exception occurs in the program, if the program does not handle it accordingly, the program will be interrupted.
In fact, after an exception is generated, the JVM will throw an instantiated object of the exception class. If a try statement is used to capture it at this time, the exception can be handled, otherwise, it will be handed over to the JVM for processing. After the try statement catches the exception, it will be matched with the exception type of the catch statement. If the match is successful, the statement in the catch statement will be executed. Simple application: add try-catch to all throws statements. Standard application: used together with try-catch-finally-throw-throws.
2. Advantages of the garbage collection mechanism
Answer: Release the space occupied by useless objects. Method: automatic recycling, manual recycling. Using System.gc(), actually call Runtime.getRuntime().gc()
3. The difference between Error and Exception
Answer: Error is processed by jvm, which is a jvm error
Exception can be processed by the program Processed, it can be captured with try-catch
4. final, finally, finalize
Answer: The value of a variable defined by final cannot be changed, a method defined by final cannot be overwritten, and a class defined by final cannot be inherited
finally is the unified outlet for exceptions, finallize is the finishing work before garbage collection, and is defined by the Object class
5. Can Anonymous Inner Class extend and implement Interface
Answer: Inheritance and implementation are allowed, because anonymous inner Classes are developed on the basis of abstract classes and interfaces
6. The difference between Static Nested Class and Inner Class
Answer: Class defined using Static is an external class and can be directly accessed through external classes. Inner classes
The Inner Class cannot be accessed from the outside, and the inner class instance can only be found through the instance of the outer class.
7. HashMap and HashTable?
Answer: HashMap: 1) released in jdk 1.2, new Class 2) uses asynchronous processing, high performance, non-thread safe 3) allows null
HashTable: 1) released in jdk 1.0, old Class 2 ) adopts synchronous processing, has low performance and is thread-safe 3) null is not allowed
8. What does assert stand for?
Answer: asserts is a new keyword released after jdk 1.4, which means assertion, that is, when the program is executed to a certain place, it must be the expected value. It is rarely used in general development. To use assert, you must add the -ea parameter
9. What is gc?
Answer: gc is garbage collection, garbage collection. Use gc to release garbage space
10. How many objects are generated by String s = new String("xyz")?
Answer: An anonymous object xyz, in the stack space. A new instantiated object in the heap space.
11. sleep() and wait()?
Answer: sleep() is a method defined by the Thread class, which indicates the sleep of the thread and can automatically wake up.
The wait() method is a method defined by the Object class and needs Manual notify() and notifyAll()//sleep() do not release resources, wait() releases resources
12. Goto exists in java, but cannot be used
13. Does the array have length(), and does String have it? length()?
Answer: Arrays have length attributes, and Strings have length()
14. The difference between Overload and Override
Answer: Overload: Overloading
|- Several methods defined in a class
|- All method names are the same, but parameter types or numbers are different
|- Only parameters are related, not return types
Overrid...the rest of the text>>

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