Şunu aradınız:: floating (Korece - İngilizce)

실수형(floating-point numbers)
string

returns the double (floating point) value of var.
this function is an alias of floatval().

the number of significant digits displayed in floating point numbers.
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see also: odbc_field_scale() to get the scale of a floating point number.
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an optional precision specifier that says how many decimal digits should be displayed for floating-point numbers. this option has no effect for other types than float. (another function useful for formatting numbers is number_format().)
u - the argument is treated as an integer, and presented as an unsigned decimal number.