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<!DOCTYPE html> <html> <body> <h2>The PHP is_nan() Function</h2> <?php // An invalid calculation return a NaN value $x = acos(8); var_dump($x); echo "<br>"; // Check if value is not a number (NaN) var_dump(is_nan($x)); ?> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>
The PHP is_nan() Function
float(NAN)
bool(true)