how to check if PHP variable contains non-numbers?

If you mean that you only want a value to contain digits then you can use ctype_digit().

You can use is_numeric() :

if ( is_numeric($_POST['foo']) ) {
    $foo = $_POST['foo'];
} else {
    // Error
}

This will check that the value is numerical, so it may contain something else than digits:

12
-12
12.1

But this will ensure that the value is a valid number.

Tags:

Php

Forms

String

Variables

Related