[Solved] Identify the error in this PHP code snippet for validating an integer input:$age = $_POST['age']; if (filter_var($age, FILTER_SANITIZE_INT)) { echo "Valid age"; } else { echo "Invalid age"; } | PHP

PHP - Superglobals and Web Context

Identify the error in this PHP code snippet for validating an integer input:

$age = $_POST['age'];
if (filter_var($age, FILTER_SANITIZE_INT)) {
    echo "Valid age";
} else {
    echo "Invalid age";
}

AMissing semicolon after echo statements

BFILTER_SANITIZE_INT should be FILTER_VALIDATE_INT

CUsing $_POST without quotes

Dfilter_var() cannot validate integers

Step-by-Step Solution

Solution:

Step 1: Understand difference between sanitize and validate
FILTER_SANITIZE_INT cleans input by removing non-numeric characters but does not validate if input is a valid integer.
Step 2: Correct filter for validation
To check if input is a valid integer, use FILTER_VALIDATE_INT instead of FILTER_SANITIZE_INT.
Final Answer:
FILTER_SANITIZE_INT should be FILTER_VALIDATE_INT -> Option B
Quick Check:
Validation needs FILTER_VALIDATE_INT, not sanitize [OK]

Quick Trick: Use FILTER_VALIDATE_INT to check integers, not sanitize [OK]

Common Mistakes:

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