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In PHP static properties are shared between inheriting classes, unless they are explicitly overwritten. However, because this functionality was implemented using reference, it was possible to break the implementation by reassigning the static property reference. This is fixed by switching the implementation from using references to using INDIRECTs, which cannot be affected by userland code.
38 lines
937 B
PHP
38 lines
937 B
PHP
--TEST--
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Inherited static properties cannot be separated from their reference set.
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--FILE--
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<?php
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class C { public static $p = 'original'; }
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class D extends C { }
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class E extends D { }
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echo "\nInherited static properties refer to the same value across classes:\n";
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var_dump(C::$p, D::$p, E::$p);
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echo "\nChanging one changes all the others:\n";
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D::$p = 'changed.all';
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var_dump(C::$p, D::$p, E::$p);
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echo "\nReferences cannot be used to split the properties:\n";
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$ref = 'changed.one';
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D::$p =& $ref;
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var_dump(C::$p, D::$p, E::$p);
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?>
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==Done==
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--EXPECT--
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Inherited static properties refer to the same value across classes:
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string(8) "original"
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string(8) "original"
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string(8) "original"
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Changing one changes all the others:
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string(11) "changed.all"
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string(11) "changed.all"
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string(11) "changed.all"
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References cannot be used to split the properties:
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string(11) "changed.one"
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string(11) "changed.one"
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string(11) "changed.one"
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==Done==
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