Difference between revisions of "PHP/inheritance"
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(Created page with "==About== PHP includes a few bits of functionality for checking whether an object or class inherits from another classoid (class, interface, or trait). The rules for this func...") |
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===Class Inheritance Functions Testing=== | ===Class Inheritance Functions Testing=== | ||
Here's a truth-table from PHP 8.2.10: | Here's a truth-table from PHP 8.2.10: | ||
| − | {| class= | + | {| class='wikitable sortable' |
! arguments || B instanceof A || is_a(B,A,FALSE) || is_a(B,A,TRUE) || is_subclass_of(B,A,FALSE) || is_subclass_of(B,A,TRUE) | ! arguments || B instanceof A || is_a(B,A,FALSE) || is_a(B,A,TRUE) || is_subclass_of(B,A,FALSE) || is_subclass_of(B,A,TRUE) | ||
|- | |- | ||
| Line 63: | Line 63: | ||
| Y | | Y | ||
|} | |} | ||
| + | |||
| + | Key: | ||
| + | * cX = class X | ||
| + | * iX = interface X | ||
| + | * oX = object of class X | ||
| + | * tX = trait X | ||
Revision as of 12:39, 5 April 2024
About
PHP includes a few bits of functionality for checking whether an object or class inherits from another classoid (class, interface, or trait). The rules for this functionality are not always clearly explained.
Class Inheritance Functions Testing
Here's a truth-table from PHP 8.2.10:
| arguments | B instanceof A | is_a(B,A,FALSE) | is_a(B,A,TRUE) | is_subclass_of(B,A,FALSE) | is_subclass_of(B,A,TRUE) |
|---|---|---|---|---|---|
| cA, cA | - | - | Y | - | - |
| cB, cA | - | - | Y | - | Y |
| oB, cA | Y | Y | Y | Y | Y |
| cA, iA | - | - | Y | - | Y |
| cB, iA | - | - | Y | - | Y |
| cB, iB | - | - | Y | - | Y |
| oB, iA | Y | Y | Y | Y | Y |
| oB, iB | Y | Y | Y | Y | Y |
Key:
- cX = class X
- iX = interface X
- oX = object of class X
- tX = trait X