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<?php /** * Example of dynamic property that is initialized only when the property is invoked, * i.e. only on get. */ class DynamicPropInitOnGet { public $prop1; public $prop2; public $prop3; public function __construct( $props ) { foreach ( $props as $prop => $value ) { $this->$prop = $value; } } public function __get( $key ) { switch ( $key ) { case 'known': $known = new stdClass(); foreach ( array( 'prop1', 'prop2' ) as $column ) { $known->{$column} = isset( $this->{$column} ) ? $this->{$column} : null; } return $known; } } } class TestMagicMethods { private $obj; private $is_known_prop = false; public function __construct( $obj ) { $this->obj = $obj; } public function test( $prop ) { $this->is_known_prop = ( 'known' === $prop ); // __isset. $this->test_isset( $prop ); // __get(). $this->test_get( $prop ); // __isset() after __get(). $this->test_isset( $prop, true ); // __unset(). $this->test_unset( $prop ); } private function test_isset( $prop, $after_get = false ) { $actual = isset( $this->obj->$prop ); if ( ! $after_get ) { printf( "__isset() results should be false %s\n", $this->test_results( false === $actual ) ); } else { $expected = $this->is_known_prop; printf( "\n\n__isset() after __get() results should be %s %s\n", $this->is_known_prop ? 'true' : 'false', $this->test_results( $expected == $actual ) ); } var_dump( $actual ); } private function test_get( $prop ) { $actual = $this->obj->$prop; $message = "\n\n__get() results should be %s %s\n"; if ( $this->is_known_prop ) { printf( $message, 'an object with prop1 and prop2', $this->test_results( $actual instanceof stdClass ) ); } else { printf( $message, 'null', $this->test_results( null === $actual ) ); } var_dump( $actual ); } private function test_set( $prop ) { $value = $this->is_known_prop ? (array) $this->$obj->known : 'I am an unknown dynamic property'; $obj->$prop = $value; $actual = $this->obj->$prop; if ( $this->is_known_prop ) { printf( "\n\n" . '__set() results should set the value %s and not throw a deprecation on PHP 8.2+.' . 'However, once the __get() is called again, it will set reset it to an object with prop1 and prop2.' . "\n", $this->test_results( $actual instanceof stdClass ) ); } else { printf( "\n\n" . '__set() results should set the value %s and not throw a deprecation on PHP 8.2+.' . 'The set value should remain set when invoking __get()' . "\n", $this->test_results( $value === $actual ) ); } var_dump( $actual ); } private function test_unset( $prop ) {// unset. unset( $this->obj->$prop ); $actual = $this->obj->$prop; $message = "\n\n__unset() + __get() results should be %s %s\n"; if ( $this->is_known_prop ) { printf( $message, 're-init the object with prop1 and prop2', $this->test_results( $actual instanceof stdClass ) ); } else { printf( $message, 'null', $this->test_results( null === $actual ) ); } var_dump( $actual ); } private function test_results( $actual ) { return $actual ? '✅' : '❌'; } } $obj = new DynamicPropInitOnGet( array( 'prop1' => 'foo', 'prop2' => 'bar', 'prop3' => 'baz', ) ); $tester = new TestMagicMethods( $obj ); echo "***** Test the 'known' property *****\n\n"; $tester->test( 'known' ); echo "\n\n***** Unknown, unexpected dynamic property *****\n\n"; $tester->test( 'unknown' );

Version	System time (s)	User time (s)	Memory (MiB)
8.4.2	0.004	0.004	19.57
8.4.1	0.008	0.000	19.48
8.3.15	0.004	0.015	18.98
8.3.14	0.011	0.004	20.71
8.3.13	0.006	0.003	18.24
8.3.12	0.000	0.010	19.10
8.3.11	0.008	0.000	20.94
8.3.10	0.009	0.000	24.06
8.3.9	0.004	0.011	26.77
8.3.8	0.004	0.004	16.63
8.3.7	0.010	0.007	18.30
8.3.6	0.011	0.007	16.67
8.3.5	0.018	0.004	16.81
8.3.4	0.003	0.020	19.84
8.3.3	0.010	0.013	19.05
8.3.2	0.011	0.011	21.73
8.3.1	0.019	0.003	21.90
8.3.0	0.007	0.015	18.99
8.2.27	0.006	0.012	17.46
8.2.26	0.011	0.007	18.61
8.2.25	0.015	0.003	18.45
8.2.24	0.000	0.009	17.46
8.2.23	0.008	0.000	22.58
8.2.22	0.004	0.008	37.54
8.2.21	0.006	0.003	26.77
8.2.20	0.006	0.003	16.75
8.2.19	0.013	0.010	16.75
8.2.18	0.012	0.009	16.63
8.2.17	0.010	0.013	18.94
8.2.16	0.000	0.016	19.97
8.2.15	0.007	0.014	19.06
8.2.14	0.012	0.009	20.56
8.2.13	0.011	0.011	20.39
8.2.12	0.007	0.011	19.27
8.2.11	0.009	0.006	19.31
8.2.10	0.018	0.004	19.14
8.2.9	0.015	0.006	18.96
8.2.8	0.010	0.010	19.44
8.2.7	0.013	0.006	18.63
8.2.6	0.008	0.008	18.85
8.2.5	0.012	0.003	19.31
8.2.4	0.004	0.012	18.82
8.2.3	0.007	0.013	18.84
8.2.2	0.013	0.006	18.78
8.2.1	0.013	0.003	18.70
8.2.0	0.007	0.011	18.83
8.1.31	0.004	0.011	22.10
8.1.30	0.007	0.011	19.54
8.1.29	0.003	0.006	18.88
8.1.28	0.007	0.014	25.92
8.1.27	0.009	0.006	22.07
8.1.26	0.006	0.013	21.84
8.1.25	0.015	0.004	22.13
8.1.24	0.006	0.010	18.48
8.1.23	0.010	0.010	18.62
8.1.22	0.012	0.009	19.07
8.1.21	0.012	0.004	18.57
8.1.20	0.009	0.006	18.66
8.1.19	0.017	0.000	18.65
8.1.18	0.004	0.015	18.38
8.1.17	0.014	0.004	18.82
8.1.16	0.010	0.006	18.35
8.1.15	0.004	0.011	18.87
8.1.14	0.000	0.015	18.76
8.1.13	0.009	0.006	18.86
8.1.12	0.006	0.009	18.52
8.1.11	0.012	0.003	18.58
8.1.10	0.009	0.006	19.74
8.1.9	0.011	0.004	18.68
8.1.8	0.009	0.006	19.73
8.1.7	0.012	0.003	18.80
8.1.6	0.011	0.004	18.75
8.1.5	0.015	0.000	18.63
8.1.4	0.011	0.004	18.81
8.1.3	0.007	0.007	19.04
8.1.2	0.009	0.006	20.11
8.1.1	0.006	0.009	18.60
8.1.0	0.000	0.015	18.43