FILTER_VALIDATE_INT FILTER_SANITIZE_NUMBER_INT to sanitize and validate integer data of a variable in PHP

Validate integer input and ranges

FILTER_VALIDATE_INT validates integer text and can enforce minimum and maximum ranges through the options array.

$options = ['options' =&gt; ['min_range' =&gt; 1, 'max_range' =&gt; 100]];
$result = filter_var('42', FILTER_VALIDATE_INT, $options);
var_dump($result);

$book_id='abc'; // Change this value to get different result

if(filter_var($book_id,FILTER_VALIDATE_INT)){
echo " Yes validation passed ";
}else{
echo " No validation failed ";
}

Output

No validation failed

By using FILTER_VALIDATE_INT we can validate variables to check if integer data is present or not.
By using filter id of FILTER_VALIDATE_INT the same script can be written as

if(filter_var($book_id,257)){

Now let us add one more option where we will assign minimum and maximum acceptable value of the integer. The option is added by using an array

$book_id='5'; // Change this value to get different result

if(filter_var($book_id,FILTER_VALIDATE_INT, array("options"=&gt;array("min_range"=&gt;-10, "max_range"=&gt;50)) )){
echo " Yes validation passed ";
}else{
echo " No validation failed ";
}

In the above code we have used Minimum value and Maximum value for validating the integer variable. We can also specify only maximum or only minimum value by changing like this. ( One line only )

if(filter_var($book_id,FILTER_VALIDATE_INT, array("options"=>array("min_range"=>8)) )){

You can also read is_numeric.php to check data

FILTER_SANITIZE_NUMBER_INT

Id of this function is 519. By using FILTER_SANITIZE_NUMBER_INT we can remove all chars except digits and + - signs. Here is an example

$str='41!5~6+7'; // Change this value to get different result
$str = filter_var($str,FILTER_SANITIZE_NUMBER_INT);
echo $str;

Output of this is here

4156+7

Filter reference Validating Boolean data Ctype_alnum to check alphanumeric characters Validating Email address

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

About the author Watch on YouTube

Connect:

Subscribe to our YouTube Channel here