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Unsigned integers are converted to signed values in certain situations; this behavior is different from other programming languages. Floating point numbers are also stored in a platform-specific range.
They can be specified using floating point notation, or two forms of scientific notation. These are typically created by functions from a particular extension, and can only be processed by functions from the same extension; examples include file, image, and database resources. Order is preserved in lists of values and in hashes with both keys and values, and the two can be intermingled.
In this manner, normal PHP functions can be used, for example, as callbacks or within function tables.
Function calls must use parentheses, with the exception of zero-argument class constructor functions called with the PHP operator new, in which case parentheses are optional. Until PHP 5. Such a function is a first-class object, meaning that it can be stored in a variable, passed as a parameter to other functions, etc.
So, for example, if a parameter's type is int, PHP would allow not only integers, but also convertible numeric strings, floats or booleans to be passed to that function, and would convert them. In the new approach, objects are referenced by handle , and not by value.