Friday, December 24, 2010

What is Type Juggling in php

Type Juggling in php:

PHP does not require explicit type definition in variable declaration. a variable's type is determined by the context in which that variable is used. That is, if you assign a string value to variable $var, $var becomes a string. If you then assign an integer value to $var, it becomes an integer.

An example of PHP's automatic type conversion is the addition operator '+'. If any of the operands is a float, then all operands are evaluated as floats, and the result will be a float. Otherwise, the operands will be interpreted as integers, and the result will also be an integer. Note that this does NOT change the types of the operands themselves; the only change is in how the operands are evaluated.

$foo += 2; // $foo is now an integer (2)
$foo = $foo + 1.3; // $foo is now a float (3.3)
$foo = 5 + "10 Little Piggies"; // $foo is integer (15)
$foo = 5 + "10 Small Pigs"; // $foo is integer (15)

If the last two examples above seem odd, see String conversion to numbers.
If you wish to change the type of a variable, see settype().
If you would like to test any of the examples in this section, you can use the var_dump() function.
Note: The behavior of an automatic conversion to array is currently undefined

What are the functions for IMAP?

Internet Message Access Protocol:

imap_body : Read the message body
imap_check : Check current mailbox
imap_delete : Mark a message for deletion from current mailbox
imap_mail : Send an email message

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