PHP. Руководство по PHP. 2005

is_finite

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is_finite

(PHP4>= 4.2.0, PHP5)is_finite -- Finds whether a value is a legal finite number

Description

bool is_finite (float val)

Returns TRUE if val is a legal finite

number within the allowed range for a PHP float on this platform.

See also is_infinite() and

is_nan().

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hypot

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is_infinite