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PHP

PHP Interview Questions

1. How PHP is executed in server?

1.cgi = adv/disadvantage, 2.so or dll  object => adv/disadvantage

2. Why the interface involve?
3. Where to use interface and abstract class?
4. What are design patterns , give 2 example?
5. Different b/w dedicated server and cloud computing?
6. How many ways you will validate soap request?
7. How to do to array and object iteration ?
8. How to use caching for static data like user information and frequent used image?
9. How to set expiration date and time for tpl file?
10. is it possible to extend smarty class? Yes

Brainbench php 5.3 Question Answers

1.Based on the sample code below, what is the result ?

<?php
 
class Vehicle  
     protected static 
$mCarColor 'White'
     protected static 
$mCarDoors 4
     public static function 
getCarColor() { 
         return 
self::$mCarColor;     
         } 
         public static function 
getCarDoors() { 
             return 
self::$mCarDoors
        }   

 class 
Cabriolet extends Vehicle  
                 protected static 
$mCarColor 'Red'
                 protected static 
$mCarDoors 3
                 public static function 
getCarDoors() { 
                     return 
self::$mCarDoors
             }  
    }
?>

Web Service using SOAP

Simple Object Access Protocol(SOAP) provides communicate between applications is over HTTP protocol. The communication of request and response by the xml data.

prerequisite PHP Extension are
XML ,SOAP, XSL

Web services approach has 2 component
1. Service Provider (Service provider)
2. Service requester (Service Consumer)

web spider, crawler, indexing and search engine Scripts

The heart of web Spider is just 2 process.

1.Parsing HTTP Text (HTML).
2.How you Traverse the Link.

Parsing HTTP Text:

Generally CURL Library is used grab the content of HTML. From The HttpText we have grab the URL as follows
1. Links(like anchor tag)
2. Form action attribute
3.Meta Tag .
Store the Link from database.

Traverse Link:

Writing Business Critical Applications in PHP

Hi,
Generally Business critical applications that need performance will use a byte-code cache such as Zend Platform, APC(Alternative PHP Cache), eAccelerator, etc…
In the above APC is light weight cache engine which is written by Yahoo & using it.

PHP 5.3 suppots 64 bit numbers

The PHP 5.3 supports processing 64 bit data for the integer values only, but the floating point numbers remains constant as follows
Double => The value stored as per IEEE 754 standard

32 bit Platform

Integer => can hold 32 bit values => 2 ^31 to 2^31-1 => 2147483648 to 2147483647
Float => can hold 64 bit values => Mantissa(m):0-51,Exponent (e):52-62,Sign:1, =>4.9 x 10-307 .. 1.8 x 10+308

64 bit Platform

Integer => can hold 64 bit values =>2 ^63 to 2^63-1 => 9223372036854775808 to 9223372036854775807

Read XML Child Node (Xpath)Values of Specific Parent Tag

I need the Node values of child tag(person name) from specific parent tag (Person) only not any of other other child Node value.
for Ex:
I need the Node values of all Person Name only,
since name tag is same for both person name and its sub child name (company name) also, i am getting both person name & company name.
I am using Dom getElementsByTagName function.Please any of one help me how to grab the values of specific Tag level only. The code as follows.

<?php
$vXML
="
<info>
<person>
<name>person 1 </name>
<email>email1@yahoo.com</email>
<company>
<name>company 1 </name>?>

Packing and Unpacking for 64 bit Data in PHP 5.3

In arise of PHP 5.3 supports of 64 bit data processing , But small things was missed like
Packing and Unpacking for 64 bit. in Perl , Q argument used for processing 64 bit data.

<?php
$vBinData 
pack("Q"0x123456781234568);
$vHexData bin2hex($vBinData);
var_dump($vHexData);
list(,
$v32Value) = unpack('Q'chr(0x80).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x00).chr(0x09));
print 
$v32Value;
echo 
hexdec(dechex($v32Value)) . "0x" dechex($v32Value)  ;
?>

PHP6 with unicode

There are 2 steps for Configure PHP 6
1. you have Configure and Installing ICU (International Components for Unicode)
2. After step1 only you can Configure PHP 6

Steps for Configure and Installing ICU (International Components for Unicode)

wget ftp://ftp.software.ibm.com/software/glo ... _6-src.tgz
mkdir /usr/local/lib/icu-3_6
tar -xvf icu*
cd icu/source
./configure --prefix=/usr/local/lib/icu-3_6
make && make install

Configure PHP 6
if u already installed by rpm, .debian package then give that corresponding ICU path. now assume /usr/local/lib/icu-3_6 as follows