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Php Advanced Interview Questions

Q   |   QA

There are two possible ways to bridge PHP and Java: you can either integrate PHP into a Java Servlet environment, which is the more stable and efficient solution, or integrate Java support into PHP. The former is provided by a SAPI module that interfaces with the Servlet server, the latter by this Java extension.
The Java extension provides a simple and effective means for creating and invoking methods on Java objects from PHP. The JVM is created using JNI, and everything runs in-process.

Example Code:

getProperty(‘java.version’) . ”; echo ‘Java vendor=’ . $system->getProperty(‘java.vendor’) . ”; echo ‘OS=’ . $system->getProperty(‘os.name’) . ‘ ‘ . $system->getProperty(‘os.version’) . ‘ on ‘ . $system->getProperty(‘os.arch’) . ‘ ‘; // java.util.Date example $formatter = new Java(‘java.text.SimpleDateFormat’, "EEEE, MMMM dd, yyyy ‘at’ h:mm:ss a zzzz"); echo $formatter->format(new Java(‘java.util.Date’)); ?>

The behaviour of these functions is affected by settings in php.ini.
Table 1. Java configuration options
Name
Default
Changeable
java.class.path
NULL
PHP_INI_ALL
Name Default Changeable
java.home
NULL
PHP_INI_ALL
java.library.path
NULL
PHP_INI_ALL
java.library
JAVALIB
PHP_INI_ALL

The session support can be turned on automatically at the site level, or manually in each PHP page script:

  • Turning on session support automatically at the site level: Set session.auto_start = 1 in php.ini.
  • Turning on session support manually in each page script: Call session_start() funtion.

Expression preceding the ? is evaluated, if it’s true, then the expression preceding the : is executed, otherwise, the expression following : is executed.

It’s how they handle failures. If the file is not found by require(), it will cause a fatal error and halt the execution of the script. If the file is not found by include(), a warning will be issued, but execution will continue.

session_id() returns the session id for the current session.

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