Simple example:
<?php
class Test {}
$test1 = new Test;
$test1_id = spl_object_id( $test1 );
$test2 = new Test;
$test2_id = spl_object_id( $test2 );
var_dump( $test1_id === $test2_id );
var_dump( $test1_id );
var_dump( $test2_id );
?>
Returns
bool(false)
int(5288)
int(5287)
spl_object_id
(PHP 7 >= 7.2.0, PHP 8)
spl_object_id — Return the integer object handle for given object
Description
This function returns a unique identifier for the object. The object id is unique for the lifetime of the object. Once the object is destroyed, its id may be reused for other objects. This behavior is similar to spl_object_hash().
Parameters
object-
Any object.
Return Values
An integer identifier that is unique for each currently existing object and is always the same for each object.
Examples
Example #1 A spl_object_id() example
<?php
$id = spl_object_id($object);
$storage[$id] = $object;
?>Notes
Note:
When an object is destroyed, its id may be reused for other objects.
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