PHP create empty object using existing object of same class

Question

Is there are any native PHP function equivalent of the following:

function newObject($object) {
    $class = get_class($object);
    return new $class;
}

Well, what do you know? (first result for get name of class object belongs to) — SeinopSys
– SeinopSys, Commented Nov 25, 2015 at 20:15
@DJDavid98 not quite. That returns name of class, not actual object. Said function is used in the example — brietsparks
– brietsparks, Commented Nov 25, 2015 at 20:16
Nevermind, I didn't notice you needed a native function. That said, I doubt there is one. — SeinopSys
– SeinopSys, Commented Nov 25, 2015 at 20:17
@RyanVincent He's asking if there's a built-in function to do exactly what he's doing here I believe. — SeinopSys
– SeinopSys, Commented Nov 25, 2015 at 20:19

GolezTrol · Accepted Answer · 2015-11-25 20:22:11Z

1

I don't think there is.

And there is no shortcut either. new get_class($x); tries to use the class get_class, and new (get_class($x)); is syntactically incorrect, because the parentheses are not allowed. You can use a variable containing a class name, but you cannot use any string expression.

answered Nov 25, 2015 at 20:22

GolezTrol

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1 Comment

SeinopSys Over a year ago

I agree. You could take a "shortcut" by making a function such as function makeInstance($str){ return new $str; } and calling it like return makeInstance(get_class($x)), but that might just count as taking the longer route. @OP should stick to their implementation, as a function just for this purpose seems like an unlikely addition to the language,

bishop · Accepted Answer · 2015-11-25 20:42:57Z

1

Single function, no. Idiomatic way, yes. Use ReflectionObject:

class Foo {
}

$foo = new Foo();
$foo->bar = 'baz';

// this is the magic:
$new = (new ReflectionObject($foo))->newInstance();

var_dump($foo, $new);

See it live.

edited Nov 25, 2015 at 20:42

answered Nov 25, 2015 at 20:36

bishop

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