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run code in 300+ PHP versions simultaneously
<?php class Document { } class a { function __construct(array $config) { } } class b extends a { protected Document $document; function __construct($document) { if (is_array($document)) { // deprecation warning $this->document = new Document; // get from factory // do config stuff return; } $this->document = $document; } } $x = new b(new Document); var_dump($x);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
object(b)#1 (1) { ["document":protected]=> object(Document)#2 (0) { } }

preferences:
116.2 ms | 407 KiB | 5 Q