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<?php $arr = (object) [ 'children' => [] ]; $arr->children[] = 1; print_r($arr); class Test { public function test(){ $arr = (object) [ 'children' => [] ]; $arr->children[] = 1; return $arr; } } $o = new Test(); $o->test(); print_r( $o->test() );
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.3.32 - 7.3.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
stdClass Object ( [children] => Array ( [0] => 1 ) ) stdClass Object ( [children] => Array ( [0] => 1 ) )
Output for 7.0.2 - 7.0.20, 7.1.0 - 7.1.7, 7.1.20 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Test has a deprecated constructor in /in/PJR7m on line 10 stdClass Object ( [children] => Array ( [0] => 1 ) ) stdClass Object ( [children] => Array ( [0] => 1 ) )
Output for 7.1.10

Process exited with code 137.
Output for 7.0.0 - 7.0.1
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Test has a deprecated constructor in /in/PJR7m on line 10 stdClass Object ( [children] => Array ( [0] => 1 ) ) stdClass Object ( [children] => Array ( [0] => 1 [1] => 1 ) )
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184.59 ms | 402 KiB | 213 Q