Question

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What's the correct way to test if a variable is a number in PHP?

I have two variables coming in from a form:

$minNo = mysql_real_escape_string($_GET["minNo"]);
$maxNo = mysql_real_escape_string($_GET["maxNo"]);

How can I check whether they are numerical values or not?

Answer 1

Try is_numeric.

Finds whether the given variable is numeric. Numeric strings consist
of optional sign, any number of digits, optional decimal part and
optional exponential part. Thus +0123.45e6 is a valid numeric value.
Hexadecimal notation (0xFF) is allowed too but only without sign,
decimal and exponential part.