Question

How to find whether a value is not a number in PHP

Answer 1

var_dump(is_nan(30));

/*
run: 

bool(false) 

*/

 

70+ SQL courses for beginners and professionals

Answer 2

var_dump(is_nan(3.14));

/*
run: 

bool(false) 

*/

 

70+ SQL courses for beginners and professionals

Answer 3

$n = acos(8);
echo $n . "<br />";

var_dump(is_nan($n));

/*
run: 

NAN
bool(true) 

*/

 

70+ SQL courses for beginners and professionals