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
What's the difference between accessing a class method via -> and via ::?
What is php artisan serve?
Which php mvc framework is best?
How failures in execution are handled with include() and require() functions?
What software is required to run php?
What is php simple definition?
What is csrf cookie?
How to replace a substring in a given string?
What is mysql_fetch_array?
Does php support multiple inheritances?
What is overloading and overriding in oop?
When to use inquire vs enquire?
Where is the functions php in wordpress?
How to access standard error stream in PHP?
What does $_server mean?
