Structs data type in php

Question

Can anyone give me example for structs data type in php   How come there is something like structs in php all of a sudden

User · Answer

I cobbled together a  dynamic  struct class today  had a look tonight and someone has written something similar with better handling of constructor parameters  it might be worth a look   http   code activestate com recipes 577160-php-struct-port   One of the comments on this page mentions an interesting thing in PHP - apparently you re able to cast an array as an object  which lets you refer to array elements using the arrow notation  as you would with a Struct pointer in C  The comment s example was as follows    z   array  foo    gt  1   bar    gt  true   baz    gt  array 1 2 3      accessing values as properties  y    object  z  echo  y- gt foo    I haven t tried this myself yet  but it may be that you could get the desired notation by just casting - if that s all you re after  These are of course  dynamic  data structures  just syntactic sugar for accessing key value pairs in a hash   If you re actually looking for something more statically typed  then ASpencer s answer is the droid you re looking for  as Obi-Wan might say

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I recommend 2 things  First is associative array    person   Array     person  name      Joe    person  age     22    Second is classes   Detailed documentation here  http   php net manual en language oop5 php

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Only associative arrays are structs in PHP   And you can t make them strict on their own   But you can sort of fake structure strictness with classes and interfaces  but beware that unlike structures  class instances are not passed in arguments  their identifiers are     You can define a struct through an interface  or at least close to it   Structs enforce a certain structure on an object   PHP   lt   7 3  does not have native structs  but you can get around it with interfaces and type hinting   interface FooStruct        public function name     string    interface BarStruct        public function id     int    interface MyStruct       public function foo     FooStruct     public function bar     BarStruct      Any class implementing MyStruct will be a MyStruct   The way it s build up is not up to the struct  it just ensures that the data returned is correct     What about setting data   Setting struct data is problematic as we end up with getters and setters and it s something that is close to an anemic object or a DTO and is considered an anti-pattern by some people  Wrong example   interface FooStruct        public function getName     string      public function setName string  value    FooStruct    interface BarStruct        public function getId     int      public function setId int  value    BarStruct    interface MyStruct       public function getFoo     FooStruct     public function setFoo FooStruct  value    MyStruct     public function getBar     BarStruct     public function setBar BarStruct  value    MyStruct      Then we end up with class implementations that might be mutable  and a struct must not mutate  this is to make it a  data type   just like int  string   Yet there s no way to restrict that with interfaces in PHP  meaning people will be able to implement your struct interface in a class that is not a struct  Make sure to keep the instance immutable  Also a struct may then be instantiated without the correct data and trigger errors when trying to access the data   An easy and reliable way to set data in a PHP struct class is through its constructor  interface FooStruct        public function name     string    interface BarStruct        public function id     int    interface MyStruct       public function foo     FooStruct     public function bar     BarStruct     class Foo implements FooStruct       protected  name     public function   construct string  name               this- gt name    name          public function name     string             return  this- gt name          class Bar implements BarStruct       protected  id     public function   construct string  id               this- gt id    id          public function id     int             return  this- gt id          class My implements MyStruct       protected  foo   bar     public function   construct FooStruct  foo  BarStruct  bar               this- gt foo    foo          this- gt bar    bar          public function foo     FooStruct             return  this- gt foo          public function bar     BarStruct             return  this- gt bar           Type hinting using interfaces   if your IDE supports it   If you don t mind not having the strict type checking  then another way would be using interfaces or classes with comments for the IDE          Interface My     property Foo  foo     property Bar  bar     interface My               Interface Foo     property string integer  id     property string  name     interface Foo               Interface Bar     property integer  id     interface Bar        The reason to use interfaces instead of classes is for the same reason why interfaces exist in the first place  because then many classes with many implementations can have this same structure and each method function that uses it will support every class with this interface   This depends on your IDE  so you might need to use classes instead or just live without it   Note  Remember that you have to validate sanitize the data in the instance elsewhere in the code to match the comment

User · Answer

It seems that the struct datatype is commonly used in SOAP   var dump  client- gt   getTypes      array 52       0    gt    string 43   struct Bank   n string Code  n string Name  n       This is not a native PHP datatype   It seems that the properties of the struct type referred to in SOAP can be accessed as a simple PHP stdClass object    some struct    client- gt SomeMethod    echo  Name       some struct- gt Name

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A public class is one option  if you want something more encapsulated you can use an abstract anonymous class combination  My favorite part is that autocomplete still works  for PhpStorm  for this but I don t have a public class sitting around    lt  php  final class MyParentClass                   return MyStruct               public function getData    array               return array               this- gt createMyObject  One   1 0  new DateTime  now                  this- gt createMyObject  Two   2 0  new DateTime  tommorow                          private function createMyObject string  description  float  magnitude  DateTime  timeStamp   MyStruct               return new class func get args    extends MyStruct               protected function   construct array  args                                 this- gt description    args 0                    this- gt magnitude    args 1                    this- gt timeStamp    args 2                                     abstract class MyStruct       public string  description      public float  magnitude      public DateTime  timeStamp

User · Answer

Closest you d get to a struct is an object with all members public   class MyStruct       public  foo      public  bar      obj   new MyStruct     obj- gt foo    Hello    obj- gt bar    World     I d say looking at the PHP Class Documentation would be worth it  If you need a one-off struct  use the StdObject as mentioned in alex s answer

User · Answer

You can use an array   something   array      key    gt   value       key2    gt   value2       or with standard object    something   new StdClass      something- gt key    value    something- gt key2    value2

[php] Structs data type in php?

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