Checking if php variable is a number or not

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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?

score 15 · Accepted Answer · answered Mar 18 '12 at 20:20

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.

score 14 · Answer 2 · answered Mar 18 '12 at 20:21

14

Use is_numeric function, it returns bool value:

is_numeric($element)

answered Mar 18 '12 at 20:21

MarcinJuraszek

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score 6 · Answer 3 · answered Mar 18 '12 at 20:20

6

You can use is_numeric() to check if the number is numeric.

To validate as an integer, use...

$validInt = filter_var($minNo, FILTER_VALIDATE_INT);

answered Mar 18 '12 at 20:20

alex

479,566
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In my case I wanted to check that $_GET['id'] was an integer, otherwise exit. This seems to be the best method. Of course using prepared statement following this. – drooh Dec 10 '18 at 04:23

score 3 · Answer 4 · answered Mar 18 '12 at 20:20

3

using is_numeric() function...

answered Mar 18 '12 at 20:20

Cristian Rodriguez

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Checking if php variable is a number or not

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