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is_nan

is_nan

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

is_nan — Finds whether a value is not a number

Description

bool is_nan ( float $val )

Checks whether val is 'not a number', like the result of acos(1.01).

Parameters

val

The value to check

Return Values

Returns TRUE登录查看完整内容