Are there any common pitfalls to avoid when using is_numeric() in PHP for validating numerical input?

One common pitfall to avoid when using is_numeric() in PHP for validating numerical input is that it can return true for values that are not strictly numeric, such as strings containing numeric characters or floats with leading zeros. To address this issue, it's recommended to use the is_int() or is_float() functions for stricter validation of integer or float values. 

// Validate numerical input using is_int() or is_float() instead of is_numeric()
$input = "123";

if (is_int($input) || is_float($input)) {
    echo "Input is a valid integer or float.";
} else {
    echo "Input is not a valid integer or float.";
}

Keywords

is_numeric PHP validation numerical input pitfalls

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