1. What are the
differences between GET And POST methods in form submitting, givethe
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 thesubmitted is stored.
The $_GET array stores data submitted by the GET method.The $_POST array stores
data submitted by the POST method.On the browser side, the difference is
that data submitted by the GET method willbe displayed in the browser's address
field. Data submitted by the POST methodwill not be displayed anywhere on
the browser.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.
2. Who is the
father of php and explain the changes in php versions?
Answer:Rasmus Lerdorf
for version changes go to Marco Tabini is the founder and publisher of
php|architect.
3. How can
we submit from without a submit button?
Answer: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
submitthe form.
4. How many
ways we can retrieve the date in result set of mysql Using php?
Answer:As
individual objects so single record or as a set or arrays.
5. What
is the difference between mysql_fetch_object and mysql_fetch_array?
Answer:MySQL
fetch object will collect first single matching record wheremysql_fetch_array
will collect all matching records from the table in an array.
6. What
is the difference between $message and $$message?
Answer:They are
both variables. But $message is a variable with a fixed name. $$message isa
variable who's name is stored in $message. For example, if $message
contains"var", $$message is the same as $var.
7. How
can we extract string 'abc.com ' from a string'http://info@a...' using
regular _expression of php?
Answer:We can
use the preg_match() function with "/.*@(.*)$/" asthe regular
expression pattern. For
example:preg_match("/.*@(.*)$/","http://info@abc.com",$data);echo
$data[1];
8. How can we
create a database using php and mysql?
Answer:PHP:
mysql_create_db()Mysql: create database;
9. What are the
differences between require and include, include_once?
Answer:File
will not be included more than once. If we want to include a file once only
andfurther calling of the file will be ignored then we have to use the PHP
functioninclude_once(). This will prevent problems with function redefinitions,
variablevalue reassignments, etc.
10. Can we use
include ("abc.php") two times in a php page "makeit.php"?
Answer:Yes we
can include..
11.
What are the different tables present in mysql, which type of table is
generated whenwe are creating a table in the followingsyntax: create table
employee(eno int(2),ename varchar(10)) ?
Answer:Total 5
types of tables we can create1. MyISAM2. Heap3. Merge4. InnoDB5. ISAM6.
BDBMyISAM is the default storage engine as of MySQL 3.23.
12. Functions
in IMAP, POP3 AND LDAP?
Answer:Please
visit:http://fi2.php.net/imaphttp://uk2.php.net/ldap
13. How can I
execute a php script using command line?
Just run the
PHP CLI (Command Line Interface) program and provide the PHPscript 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
notexecute properly in command line environment.
14. What are
the reasons for selecting lamp (Linux, apache, mysql, php) instead
of combination of other software programs, servers and operating systems?
Answer:All of those
are open source resource. Security of linux is very very more thanwindows.
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 orany other scripting language.
15. How can we encrypt and decrypt a data present
in a mysql table using mysql?
Answer:AES_ENCRYPT
() and AES_DECRYPT ()
16. What are
the different types of errors in php?
Answer:Three
are three types of errors:
1.Notices:
These are trivial, non-critical errors that PHP encounters whileexecuting 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.
2.Warnings:
These are more serious errors - for example, attempting to include() afile
which does not exist. By default, these errors are displayed to the user, but
theydo not result in script termination.
3.Fatal
errors: These are critical errors - for example, instantiating an object of
anon-existent class, or calling a non-existent function. These errors cause
theimmediate termination of the script, and PHP's default behaviour is to
display themto the user when they take place.
17. What is the
functionality of the function strstr and stristr?
Answer:strstr()
returns part of a given string from the first occurrence of a given substringto
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.
18. What is the
functionality of the function htmlentities?
Answer:htmlentities
-- Convert all applicable characters to HTML entitiesThis function is
identical tohtmlspecialchars()in all ways, except withhtmlentities(), all
characters which have HTML character entity equivalents aretranslated into
these entities.
19. How can we
get second of the current time using date function?
Answer:$second
= date(“s”);
20. How can we
convert the time zones using php?
Answer:
21. What is
meant by urlencode and urldocode?
Answer:urlencode()
returns the URL encoded version of the given string. URL codingconverts special
characters into % signs followed by two hex digits. For
example:urlencode("10.00%") will return "10%2E00%25". URL
encoded strings are safe tobe used as part of URLs.urldecode() returns the
URL decoded version of the given string.
22. What is the
difference between the functions unlink and unset?
Answer:unlink()
deletes the given file from the file system.unset() makes a variable undefined.
23. How can we
register the variables into a session?
Answer:We can
use the session_register ($ur_session_var) function.
24. How can we
get the properties (size, type, width, height) of an image using phpimage
functions?
Answer:To know
the Image type use exif_imagetype () functionTo know the Image size use
getimagesize () functionTo know the image width use imagesx () functionTo know
the image height use imagesy() function
25. How can we
get the browser properties using php?
Answer:
26. What is the
maximum size of a file that can be uploaded using php and how can wechange
this?
Answer:You can
change maximum size of a file set upload_max_filesize variable in php.inifile
27. How can we
increase the execution time of a php script?
Answer:Set
max_execution_time variable in php.ini file to your desired
time in second.
28. How many
ways can we get the value of current session id?
Answer:session_id()
returns the session id for the current session.
43. How can we
destroy the session, how can we unset the variable of a session?
Answer:session_unregister()
unregisters a global variable from the current session.session_unset() frees
all session variables.
29. How can we
destroy the cookie?
Answer::Set the
cookie in past.
30. How many
ways we can pass the variable through the navigation between the pages?
Answer:At least
3 ways:a) Register the variable into the sessionb) Pass the variable as a
cookiec) Pass the variable as part of the URL
31. What is the
difference between ereg_replace() and eregi_replace()?
Answer:eregi_replace()
function is identical to ereg_replace() except that this ignores
casedistinction when matching alphabetic characters.
32. What are
the different functions in sorting an array?
Answer:Sorting
functions in PHP:asort()arsort()ksort()krsort()uksort()sort()natsort()rsort()
33. How can we
know the count/number of elements of an array?
Answer:2
ways:a) sizeof($urarray) This function is an alias of count()b)
count($urarray)Interestingly if u just pass a simple var instead of a an
array it will return 1.
34. What is the
php predefined variable that tells the What types of images that phpsupports?
Answer:
$_SERVER['HTTP_ACCEPT']
35. List out some
tools through which we can draw E-R diagrams for mysql.
Answer:Dbdesigner,
conceptdraw etc.
36. List out the
predefined classes in php?
Answer:DirectorystdClass__PHP_Incomplete_Class
exceptionphp_user_filter
37. What are
the difference between abstract class and interface?
Abstract class:
abstract classes are the class where one or more methods are abstract but not
necessarily all method has to be abstract. Abstract methods are themethods,
which are declare in its class but not define. The definition of thosemethods
must be in its extending class.Interface: Interfaces are one type of class
where all the methods are abstract. Thatmeans all the methods only declared but
not defined. All the methods must be defineby its implemented class.
38. How can we
repair a mysql table?
Answer:The
syntex for repairing a mysql table isREPAIR TABLENAME, [TABLENAME, ],
[Quick],[Extended]This command will repair the table specifiedif the quick is
given the mysql will do a repair of only the index tree if the extendedis given
it will create index row by row
39. What is the
maximum length of a table name, database name, and fieldname inmysql?
Answer:Database
name- 64Table name -64Fieldname-64
40. How many
values can the SET function of mysql takes?
Answer:Mysql
set can take zero or more values but at the maximum it can take 64 values
