is_finite(): to find out legal finite number or not

bool is_finite ( float $input )
$inputRequired : Number to check.
The output is TRUE if $input is legal finite number on this platform, else False.

Example :

echo is_finite(2); Output 1 
echo "<br>";
echo is_finite(5/10); Output 1 
echo "<br>";
echo is_finite(log(0));

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