Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / mohammed khalid khan
PHP does not require (or support) explicit type definition
in variable declaration; a variable's type is determined by
the context in which that variable is used. That is to say,
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.
Since PHP (for historical reasons) supports indexing into
strings via offsets using the same syntax as array indexing,
the example above leads to a problem: should $a become an
array with its first element being "f", or should "f" become
the first character of the string $a? The current versions
of PHP interpret the second assignment as a string offset
identification, so $a becomes "f", the result of this
automatic conversion however should be considered undefined.
PHP 4 introduced the new curly bracket syntax to access
characters in string, use this syntax instead of the one
presented above
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
How can we display information of a variable and readable by a human with php?
Should I use mysqli or pdo?
What is advanced php programming?
How to create a directory?
How we load all classes that placed in different directory in one php file , means how to do auto load classes.
Are sessions stateless?
What is abstract class php?
What is the main difference between php 4 and php 5?
How to call javascript function in php on button click?
What does php mean?
What is the difference between for and foreach in php?
What is cookie?
What is php.ini & .htacess file?
How do I display php errors?
Tell me how to create a text file in php?
