As individual objects so single record or as a set or arrays.

    Get:
i. Get is one of the predefined variables.
ii. It is used to send short data
iii. Get data variables and values are visible at browser.
iv. It is unsecure.
v. 2083 character we can pass through url
    Post:
i. Post is one of the predefined variables.
ii. It is used to send more than 100 characters
iii. Post data variables and values are not visible at browser.
iv. It is secure.
v. 8 mb of data we can post

   i. using strstr function
  Echo strstr(“http://info@abc.com”, ‘@’)
or
  ii. using list and split functions
  list($first,$second)=split(“@”,”http://info@abc.com”,2)
  echo $second;

In four ways we can retrieve data from mysql database. They are
  i. mysql_fetch_array();
  ii. mysql_fetch_row();
  iii. mysql_fetch_assoc()
  iv. mysql_fetch_object()

mysql_fetch_array
  i. We can access the data by the field names or their offsets
  mysql_fetch_object
  i. We can only access the data by the field names

Types of arrays:
  • Numerically indexed arrays
  • Associative arrays
  • Multidimensional arrays
  • Sorting arrays

  Two extensions have changed.
The XSLT extension present in PHP4 is not the XSL extension in PHP 5.
Additionally, the XML-DOM extension in PHP 4 is not the DOM extension
is PHP 5. What this means is that the syntax of the functions in these extensions have changed but the purpose of the extensions has not changed.
  In PHP 4, objects were really just primitive data types, and were referenced by value. In an attempt to retain as much backward compatibility as possible, setting the zend.ze1_compatibility_mode in PHP 5 allows compatibility with the version 4 methods. There are a number of other backward incompatible changes.

  PHP is a recursive acronym for "PHP Hypertext Preprocessor". It is an open source, interpretive, HTML centric, server side scripting language. PHP is especially suited for Web development and can be embedded into HTML pages. PHP is comparable to languages such as JSP (Java Server Pages) and Oracle's PSP (PL/SQL Server Pages).
  This FAQ describes how PHP interacts with the Oracle Database. It assumes that the reader has PHP installed and working. To test if PHP is working, create a simple PHP document, say hello.php:
If PHP is working, you will see "Hello World" below:
  echo "Hello world";
  phpinfo(); // Print PHP version and config info
  ?>
Execute hello.php from command line (php hello.php) or open it from a web browser (http://localhost/hello.php) to see the output. If it's not working, PHP is not correctly installed and this FAQ will not help you.

 PHP offers two extension modules that can be used to connect to Oracle:
  * The normal Oracle functions (ORA); and
  * the Oracle Call-Interface functions (OCI).
OCI should be used whenever possible since it is optimised and provides more options. For example, ORA doesn't include support for CLOBs, BLOBs, BFILEs, ROWIDs, etc.