Get PHP class property by string

Question

How do I get a property in a PHP based on a string  I ll call it magic  So what is magic    obj- gt Name    something    get    obj- gt Name    would be like     magic  obj   Name    something     get   magic  obj   Name

User · Answer

Just store the property name in a variable  and use the variable to access the property  Like this    name    Name     obj- gt  name    something    get    obj- gt  name

User · Answer

In case anyone else wants to find a deep property of unknown depth  I came up with the below without needing to loop through all known properties of all children    For example  to find  Foo- Bar- baz  or  Foo- baz  or  Foo- Bar- Baz- dave  where  path is a string like  foo bar baz    public function callModule  pathString   delimiter                split the string into an array      pathArray   explode  delimiter   pathString          get the first and last of the array      module   array shift  pathArray        property   array pop  pathArray          if the array is now empty  we can access simply without a loop     if count  pathArray     0           return  this- gt   module - gt   property                we need to go deeper        tmp    this- gt Foo      tmp    this- gt   module        foreach  pathArray as  deeper             re-assign  tmp to be the next level of the object             tmp    Foo- gt Bar --- then  tmp    Bar- gt baz          tmp    tmp- gt   deeper                now we are at the level we need to be and can access the property     return  tmp- gt   property        And then call with something like    propertyString   getXMLAttribute  string         Foo Bar baz   propertyString   substr  propertyString  1    moduleCaller   new ModuleCaller    echo  moduleCaller- gt callModule  propertyString

User · Answer

Like this   lt  php   prop    Name    echo  obj- gt  prop    Or  if you have control over the class  implement the ArrayAccess interface and just do this  echo  obj  Name

User · Answer

It is simple   obj-   obj- Name  the curly brackets will wrap the property much like a variable variable   This was a top search  But did not resolve my question  which was using  this  In the case of my circumstance using the curly bracket also helped      example with Code Igniter get instance  in an sourced library class called something with a parent class instance   this- gt someClass  something    this- gt someID 34    the library class needing to source from another class also with the parents instance  echo  this- gt CI- gt   this- gt someClass - gt   this- gt someID

User · Answer

Just as an addition  This way you can access properties with names that would be otherwise unusable x   new StdClass    prop    a b    x-  prop   1   x-   x y     2  var dump  x  object stdClass  1  2        a b       int 1      x y       int 2    not that you should  but in case you have to   If you want to do even fancier stuff you should look into reflection

User · Answer

Here is my attempt  It has some common  stupidity  checks built in  making sure you don t try to set or get a member which isn t available   You could move those  property exists  checks to   set and   get respectively and call them directly within magic      lt  php  class Foo       public  Name       public function magic  member   value   NULL            if   value    NULL                if   property exists  this   member                     trigger error  Undefined property via magic                             member  E USER ERROR                   return NULL                             this- gt  member    value            else               if   property exists  this   member                     trigger error  Undefined property via magic                             member  E USER ERROR                   return NULL                            return  this- gt  member                       f   new Foo      f- gt magic  Name    Something    echo  f- gt magic  Name       n       error  f- gt magic  Fame    Something    echo  f- gt magic  Fame       n      gt

User · Answer

If you want to access the property without creating an intermediate variable  use the    notation    something    object- gt   something      That also allows you to build the property name in a loop for example   for   i   0   i  lt  5   i           something    object- gt   something     i

User · Answer

classname    myclass    obj   new  classname  params     variable name    my member variable    val    obj- gt  variable name    do care about the level private public protected    func name    myFunction    val    obj- gt  func name  parameters     why edit   before   using eval  evil  after   no eval at all  being old in this language

User · Answer

What you re asking about is called Variable Variables  All you need to do is store your string in a variable and access it like so    Class    MyCustomClass    Property    Name    List   array  Name      Object   new  Class        All of these will echo the same property echo  Object- gt  Property      Evaluates to  Object- gt Name echo  Object- gt   List 0       Use if your variable is in an array

User · Answer

Something like this  Haven t tested it but should work fine   function magic  obj   var   value   NULL        if  value    NULL                return  obj- gt  var            else                obj- gt  var    value

User · Answer

There might be answers to this question  but you may want to see these migrations to PHP 7    source  php net

User · Answer

What this function does is it checks if the property exist on this class of any of his child s  and if so it gets the value otherwise it returns null  So now the properties are optional and dynamic          check if property is defined on this class or any of it s childes and return it        param  property        return bool     private function getIfExist  property         value   null       propertiesArray   get object vars  this        if array has  propertiesArray   property             value    propertiesArray  property              return  value      Usage   const CONFIG FILE PATH PROPERTY    configFilePath     configFilePath    this- gt getIfExist self  CONFIG FILE PATH PROPERTY

[php] Get PHP class property by string

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