1. What are the differences between GET and POST methods in form submitting, give the case where we can use get and we can use post methods? |
On the server side, the main difference between GET and POST is where the submitted is stored. The $_GET array stores data submitted by the GET method. The $_POST array stores data submitted by the POST method. |
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On the browser side, the difference is that data submitted by the GET method will be displayed in the browser’s address field. Data submitted by the POST method will not be displayed anywhere on the browser. |
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GET method is mostly used for submitting a small amount and less sensitive data. POST method is mostly used for submitting a large amount or sensitive data. |
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2. Who is the father of php and explain the changes in php versions? |
Rasmus Lerdorf for version changes go to http://php.net/ Marco Tabini is the founder and publisher of php|architect. |
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3. How can we submit from without a submit button? |
We can use a simple JavaScript code linked to an event trigger of any form field. In the JavaScript code, we can call the document.form.submit() function to submit the form. For example: |
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4. How many ways we can retrieve the date in result set of mysql Using php? |
As individual objects so single record or as a set or arrays. |
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5. What is the difference between mysql_fetch_object and mysql_fetch_array? |
MySQL fetch object will collect first single matching record where mysql_fetch_array will collect all matching records from the table in an array. |
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6. What is the difference between $message and $$message? |
They are both variables. But $message is a variable with a fixed name. $$message is a variable who’s name is stored in $message. For example, if $message contains "var", $$message is the same as $var. |
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7. How can we extract string ‘abc.com ‘ from a string ‘http://info@a…’ using regular _expression of php? |
We can use the preg_match() function with "/.*@(.*)$/" as the regular expression pattern. For example: preg_match("/.*@(.*)$/","http://info@abc.com",$data); echo $data[1]; |
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8. How can we create a database using php and mysql? |
PHP: mysql_create_db() |
Mysql: create database; |
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9. What are the differences between require and include, include_once? |
File will not be included more than once. If we want to include a file once only and further calling of the file will be ignored then we have to use the PHP function include_once(). This will prevent problems with function redefinitions, variable value reassignments, etc. |
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10. Can we use include ("abc.php") two times in a php page "makeit.php"? |
Yes we can include.. |
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11. What are the different tables present in mysql, which type of table is generated when we are creating a table in the following |
syntax: create table employee(eno int(2),ename varchar(10)) ? |
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Total 5 types of tables we can create |
1. MyISAM |
2. Heap |
3. Merge |
4. InnoDB |
5. ISAM |
6. BDB |
MyISAM is the default storage engine as of MySQL 3.23. |
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12. Functions in IMAP, POP3 AND LDAP? |
Please visit: |
http://fi2.php.net/imap |
http://uk2.php.net/ldap |
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13. How can I execute a php script using command line? |
Just run the PHP CLI (Command Line Interface) program and provide the PHP script file name as the command line argument. For example, "php myScript.php", assuming "php" is the command to invoke the CLI program. |
Be aware that if your PHP script was written for the Web CGI interface, it may not execute properly in command line environment. |
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14. Suppose your ZEND engine supports the mode Then how can u configure your php ZEND engine to support mode ? |
If you change the line: short_open_tag = off in php.ini file. Then your php ZEND engine support only mode. |
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15. Shopping cart online validation i.e. how can we configure the paypals? |
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16. What is meant by nl2br()? |
nl2br — Inserts HTML line breaks before all newlines in a string string nl2br (string); Returns string with ” inserted before all newlines. For example: echo nl2br("god bless\n you") will output "god bless \n you" to your browser. |
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17. Draw the architecture of ZEND engine?
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18. What are the current versions of apache, php, and mysql? |
PHP: php5.1.2 |
MySQL: MySQL 5.1 |
Apache: Apache 2.1 |
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19. What are the reasons for selecting lamp (Linux, apache, mysql, php) instead of combination of other software programs, servers and operating systems? |
All of those are open source resource. Security of linux is very very more than windows. Apache is a better server that IIS both in functionality and security. Mysql is world most popular open source database. Php is more faster that asp or any other scripting language. |
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20. How can we encrypt and decrypt a data present in a mysql table using mysql? |
AES_ENCRYPT () and AES_DECRYPT () |
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21. How can we encrypt the username and password using php? |
You can encrypt a password with the following Mysql>SET PASSWORD=PASSWORD("Password"); |
We can encode data using base64_encode($string) and can decode using base64_decode($string); |
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22. How many ways I can redirect a php page? |
Here are the possible ways of php page redirection. |
Using Java script: |
'; echo 'window.location.href="'.$filename.'";'; echo ''; echo ''; echo ''; echo ''; } } redirect('http://maosjb.com'); ?> |
Using php function: |
Header("Location:http://maosjb.com "); |
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23. List out different arguments in php header function? |
void header ( string string [, bool replace [, int http_response_code]]) |
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24. What type of headers have to add in the mail function in which file a attached? |
$boundary = '—–=' . md5( uniqid ( rand() ) ); |
$headers = "From: \"Me\"\n"; |
$headers .= "MIME-Version: 1.0\n"; |
$headers .= "Content-Type: multipart/mixed; boundary=\"$boundary\""; |
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25. What are the differences between public, private, protected, static, transient, final and volatile? |
element Class Interface |
Data field Method Constructor |
modifier top level nested top level nested |
(outer) (inner) (outer) (inner) |
final yes yes no yes yes no no |
private yes yes yes no yes no yes |
protected yes yes yes no yes no yes |
public yes yes yes yes yes yes yes |
static yes yes no no yes no yes |
transient yes no no no no no no |
volatile yes no no no no no no |
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26. What are the different types of errors in php? |
Three are three types of errors: |
1. Notices: These are trivial, non-critical errors that PHP encounters while executing a script - for example, accessing a variable that has not yet been defined. By default, such errors are not displayed to the user at all - although, as you will see, you can change this default behaviour. |
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2. Warnings: These are more serious errors - for example, attempting to include() a file which does not exist. By default, these errors are displayed to the user, but they do not result in script termination. |
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3. Fatal errors: These are critical errors - for example, instantiating an object of a non-existent class, or calling a non-existent function. These errors cause the immediate termination of the script, and PHP's default behaviour is to display them to the user when they take place. |
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27. What is the functionality of the function strstr and stristr? |
strstr() returns part of a given string from the first occurrence of a given substring to the end of the string. For example: strstr("user@example.com","@") will return "@example.com". |
stristr() is idential to strstr() except that it is case insensitive. |
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28. What are the differences between PHP 3 and PHP 4 and PHP 5? |
Go read the release notes at http://php.net. |
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29. How can we convert asp pages to php pages? |
You can download asp2php front-end application from the site http://asp2php.naken.cc. |
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30. What is the functionality of the function htmlentities? Answer: htmlentities — Convert all applicable characters to HTML entities |
This function is identical to htmlspecialchars() in all ways, except with htmlentities(), all characters which have HTML character entity equivalents are translated into these entities. |
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31. How can we get second of the current time using date function? |
$second = date("s"); |
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32. How can we convert the time zones using php? |
33. What is meant by urlencode and urldocode? |
urlencode() returns the URL encoded version of the given string. URL coding converts special characters into % signs followed by two hex digits. For example: urlencode("10.00%") will return "10%2E00%25?. URL encoded strings are safe to be used as part of URLs. |
urldecode() returns the URL decoded version of the given string. |
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34. What is the difference between the functions unlink and unset? |
unlink() deletes the given file from the file system. |
unset() makes a variable undefined. |
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35. How can we register the variables into a session? |
We can use the session_register ($ur_session_var) function. |
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36. How can we get the properties (size, type, width, height) of an image using php image functions? |
To know the Image type use exif_imagetype () function |
To know the Image size use getimagesize () function |
To know the image width use imagesx () function |
To know the image height use imagesy() function |
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37. How can we get the browser properties using php? |
38. What is the maximum size of a file that can be uploaded using php and how can we change this? |
You can change maximum size of a file set upload_max_filesize variable in php.ini file |
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39. How can we increase the execution time of a php script? |
Set max_execution_time variable in php.ini file to your desired time in second. |
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40. How can we take a backup of a mysql table and how can we restore it.? |
Answer: Create a full backup of your database: shell> mysqldump –tab=/path/to/some/dir –opt db_name Or: shell> mysqlhotcopy db_name /path/to/some/dir |
The full backup file is just a set of SQL statements, so restoring it is very easy: |
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shell> mysql "."Executed"; |
mysql_close($link2); |
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41. List out the predefined classes in php? |
Directory |
stdClass |
__PHP_Incomplete_Class |
exception |
php_user_filter |
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42. How can I make a script that can be bilanguage (supports Eglish, German)? |
You can change charset variable in above line in the script to support bilanguage. |
