What is the difference between is_integer and is_numeric in PHP?

The main difference between is_integer and is_numeric in PHP is that is_integer specifically checks if a variable is an integer data type, while is_numeric checks if a variable is a numeric value (integer or float). Therefore, is_integer will return true only for variables with integer values, while is_numeric will return true for variables with both integer and float values.

$var = 5;

// Check if variable is an integer
if (is_integer($var)) {
    echo "Variable is an integer";
} else {
    echo "Variable is not an integer";
}

// Check if variable is numeric
if (is_numeric($var)) {
    echo "Variable is numeric";
} else {
    echo "Variable is not numeric";
}