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<?php $listOfIntegers = [1, 2, 3, 4]; $myObject = new stdClass(); $myObject->integers = $listOfIntegers; echo json_encode($myObject) . PHP_EOL; // Output of the code above will be: `{"integers":[1,2,3,4]}` // Now some refactoring has to be made since the requirement changed. The requirement now is that the integers list // must not contain odd values anymore. So `array_filter` to the rescue, right? $listOfEvenIntegers = array_filter([1, 2, 3, 4], static fn (int $integer): int => $integer % 2 === 0); $myObject = new stdClass(); $myObject->integers = $listOfEvenIntegers; echo json_encode($myObject) . PHP_EOL; // Output of the refactored code above now became: `{"integers":{"1":2,"3":4}}` // So what now happened is a huge problem for highly type-sensitive API clients since we changed a list to a hashmap // Same happens with hashmaps which suddenly become empty. $hashmap = [ 'foo' => 'bar', ]; $myObject = new stdClass(); $myObject->map = $hashmap; echo json_encode($myObject) . PHP_EOL; // Output of the code above will be: `{"map":{"foo":"bar"}}` // So now some properties are being added, some are being removed, the definition of your API says // "the object will contain additional properties because heck I do not want to declare every property" // "so to make it easier, every property has a string value" // can be easily done with something like this in JSONSchema: `{"type": "object", "additional_properties": {"type": "string"}}` // Now, some string value might become `null` due to whatever reason, lets say it was a bug and thus the happy path always returned a string // The most logical way here is, due to our lazyness, to use something like `array_filter` to get rid of all our non-string values $hashmap = [ 'foo' => null, ]; $myObject = new stdClass(); $myObject->map = array_filter($hashmap); echo json_encode($myObject) . PHP_EOL; // Output of the refactored code above now became: `{"map":[]}` // So in case that every array value is being wiped due to the filtering, we suddenly have a type-change from // a hashmap to a list. This is ofc also problematic since we do not want to have a list here but an empty object like // so: `{"map":{}}`

Finding entry points Branch analysis from position: 0 1 jumps found. (Code = 62) Position 1 = -2 filename: /in/Gfogn function name: (null) number of ops: 53 compiled vars: !0 = $listOfIntegers, !1 = $myObject, !2 = $listOfEvenIntegers, !3 = $hashmap line #* E I O op fetch ext return operands ------------------------------------------------------------------------------------- 3 0 E > ASSIGN !0, <array> 5 1 NEW $5 'stdClass' 2 DO_FCALL 0 3 ASSIGN !1, $5 6 4 ASSIGN_OBJ !1, 'integers' 5 OP_DATA !0 8 6 INIT_FCALL 'json_encode' 7 SEND_VAR !1 8 DO_ICALL $9 9 CONCAT ~10 $9, '%0A' 10 ECHO ~10 14 11 INIT_FCALL 'array_filter' 12 SEND_VAL <array> 13 DECLARE_LAMBDA_FUNCTION ~11 [0] 14 SEND_VAL ~11 15 DO_ICALL $12 16 ASSIGN !2, $12 16 17 NEW $14 'stdClass' 18 DO_FCALL 0 19 ASSIGN !1, $14 17 20 ASSIGN_OBJ !1, 'integers' 21 OP_DATA !2 19 22 INIT_FCALL 'json_encode' 23 SEND_VAR !1 24 DO_ICALL $18 25 CONCAT ~19 $18, '%0A' 26 ECHO ~19 25 27 ASSIGN !3, <array> 28 28 NEW $21 'stdClass' 29 DO_FCALL 0 30 ASSIGN !1, $21 29 31 ASSIGN_OBJ !1, 'map' 32 OP_DATA !3 31 33 INIT_FCALL 'json_encode' 34 SEND_VAR !1 35 DO_ICALL $25 36 CONCAT ~26 $25, '%0A' 37 ECHO ~26 41 38 ASSIGN !3, <array> 44 39 NEW $28 'stdClass' 40 DO_FCALL 0 41 ASSIGN !1, $28 45 42 INIT_FCALL 'array_filter' 43 SEND_VAR !3 44 DO_ICALL $32 45 ASSIGN_OBJ !1, 'map' 46 OP_DATA $32 47 47 INIT_FCALL 'json_encode' 48 SEND_VAR !1 49 DO_ICALL $33 50 CONCAT ~34 $33, '%0A' 51 ECHO ~34 52 52 > RETURN 1 Dynamic Functions: Dynamic Function 0 Finding entry points Branch analysis from position: 0 1 jumps found. (Code = 62) Position 1 = -2 filename: /in/Gfogn function name: {closure} number of ops: 7 compiled vars: !0 = $integer line #* E I O op fetch ext return operands ------------------------------------------------------------------------------------- 14 0 E > RECV !0 1 MOD ~1 !0, 2 2 IS_IDENTICAL ~2 ~1, 0 3 VERIFY_RETURN_TYPE ~2 4 > RETURN ~2 5* VERIFY_RETURN_TYPE 6* > RETURN null End of Dynamic Function 0