(PHP 4 >= 4.2.0, PHP 5, PHP 7)
is_finite — Finds whether a value is a legal finite number
is_finite ( float $val ) : bool
Checks whether val is a legal finite on this platform.
val
The value to check
true if val is a legal finite number within the allowed range for a PHP float on this platform, else false.
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https://www.php.net/manual/en/function.is-finite.php