How can you check if an input is not a number in PHP?

To check if an input is not a number in PHP, you can use the `is_numeric()` function to determine if the input is a number or not. If the input is not a number, the function will return false. You can then use this boolean value to perform further actions based on whether the input is a number or not. 

$input = 'abc123';

if (!is_numeric($input)) {
    echo "Input is not a number.";
} else {
    echo "Input is a number.";
}

Keywords

PHP is_numeric validation input data type

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