PHP check for instance of DateTime?

问题:

Is this the only way to check if an object is an instance of a class, in my case of the DateTime class?

$cls = ReflectionClass("DateTime");
if (! $cls->isInstance( (object) $var ) ) {
    // is not an instance
}

It seems a bit heavy to me.

回答1:

You could try instanceof^­Docs...

if ($var instanceof DateTime) {
  // true
}

See also is_a^­Docs:

if (is_a($var, 'DateTime')) {
  // true
}

回答2:

if ($var instanceof DateTime)

回答3:

You can use get_class function like this:

<?php

    $a = new DateTime();
    if (get_class($a) == 'DateTime') {
        echo "Datetime";
    }

回答4:

What about instanceof