note 98157 added to function.is-object

I've found a faster way of determining an object. If you use is_object() millions of times, you will notice a *huge* difference. On my machine, this method takes about 1/4 the time of using is_object().

Cast the value to an object, then check (using ===) if it is identical to the original.

<?php
if ( (object) $unknown === $unknown ) {
	echo '$unknown is an object';
} else {
	echo '$unknown is not an object';
}
?>

You can use this script to test the speed of both methods.

<pre>
What's faster for determining objects?

<?php

$count = 1000000;

$test = (object) array('i' => 'am', 'going' => 'to be', 'an' => 'object');
$test2 = 'im not an object';
$test3 = array('im', 'not', 'an', 'object');
$test4 = 42;
// Set this now so the first for loop doesn't do the extra work.
$i = $start_time = $end_time = 0;

$start_time = microtime(true);
for ($i = 0; $i < $count; $i++) {
	if (!is_object($test) || is_object($test2) || is_object($test3) || is_object($test4)) {
		echo 'error';
		break;
	}
}
$end_time = microtime(true);
echo 'is_object :  '.($end_time - $start_time)."\n";

$start_time = microtime(true);
for ($i = 0; $i < $count; $i++) {
	if (!(object) $test === $test || (object) $test2 === $test2 || (object) $test3 === $test3 || (object) $test4 === $test4) {
		echo 'error';
		break;
	}
}
$end_time = microtime(true);
echo 'cast, === :  '.($end_time - $start_time)."\n";

echo "\nTested $count iterations."

?>
</pre>

Prints something like:

What's faster for determining objects?

is_object :  8.2549629211426
cast, === :  2.1297039985657

Tested 1000000 iterations.
----
Server IP: 69.147.83.197
Probable Submitter: 65.44.194.66
----
Manual Page -- http://www.php.net/manual/en/function.is-object.php
Edit        -- https://master.php.net/note/edit/98157
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Del: useless     -- https://master.php.net/note/delete/98157/useless
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