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In JavaScript, there are two ways to check if a variable is a number : isNaN() – Stands for “is Not a Number”, if variable is not a number, it return true, else return false. typeof – If variable is a number, it will returns a string named “number”.
To check if given string is a number or not, use PHP built-in function is_numeric(). is_numeric() takes string as an argument and returns true if the string is all numbers, else it returns false.
Definition and UsageThe FILTER_VALIDATE_INT filter is used to validate value as integer. FILTER_VALIDATE_INT also allows us to specify a range for the integer variable. Possible options and flags: min_range - specifies the minimum integer value.
ctype_digit was built precisely for this purpose.
I use
if(is_numeric($value) && $value > 0 && $value == round($value, 0)){
to validate if a value is numeric, positive and integral
http://php.net/is_numeric
I don't really like ctype_digit as its not as readable as "is_numeric" and actually has less flaws when you really want to validate that a value is numeric.
filter_var()
$options = array(
'options' => array('min_range' => 0)
);
if (filter_var($int, FILTER_VALIDATE_INT, $options) !== FALSE) {
// you're good
}
return ctype_digit($num) && (int) $num > 0
For PHP version 4 or later versions:
<?PHP
$input = 4;
if(is_numeric($input)){ // return **TRUE** if it is numeric
echo "The input is numeric";
}else{
echo "The input is not numeric";
}
?>
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