PHP Fatal error Cannot access empty property

Question

I m new to php and I have executed below code     lt  php class my class       var  my value   array        function my class   value            this- gt my value      value            function set value   value          Error occurred from here as Undefined variable  my value          this- gt  my value    value              a   new my class   a     a- gt my value      b    a- gt set value   c     a- gt my class  d     foreach   a- gt my value as  amp  value        echo  value       gt    I got below errors  What could be the error   Notice  Undefined variable  my value in C  xampp htdocs MyTestPages f php on line 15  Fatal error  Cannot access empty property in C  xampp htdocs MyTestPages f php on line 15

User · Answer

First  don t declare variables using var  but  public  my value    Then you can access it using   this- gt my value    and not   this- gt  my value

User · Answer

You access the property in the wrong way  With the  this- gt  my value      syntax  you set the property with the name of the value in  my value  What you want is  this- gt my value        var    my value    this- gt  var    test     is the same as   this- gt my value    test     To fix a few things from your example  the code below is a better aproach  class my class        public   my value   array         function   construct   value             this- gt my value      value             function set value   value            if   is array  value                 throw new Exception  Illegal argument                        this- gt my value    value             function add value  value             this- gt my value    value            a   new my class   a     a- gt my value      b    a- gt add value  c     a- gt set value array  d       This ensures  that my value won t change it s type to string or something else when you call set value  But you can still set the value of my value direct  because it s public  The final step is  to make my value private and only access my value over getter setter methods

User · Answer

As I see in your code  it seems you are following an old documentation tutorial about OOP in PHP based on PHP4  OOP wasn t supported but adapted somehow to be used in a simple ways   since PHP5 an official support was added and the notation has been changed from what it was   Please see this code review here    lt  php class my class       public  my value   array         function   construct   value        the constructor name is   construct instead of the class name          this- gt my value      value            function set value   value          Error occurred from here as Undefined variable  my value          this- gt my value    value     remove the   sign            a   new my class   a     a- gt my value      b    a- gt set value   c       your array variable here will be replaced by a simple string      a- gt my class  d       you can call this if you mean calling the contructor       at this stage you can t loop on the variable since it have been replaced by a simple string   c   foreach   a- gt my value as  amp  value       look for foreach samples to know how to use it well     echo  value       gt    I hope it helps

User · Answer

This way you can create a new object with a custom property name    my property    foo    value    bar    a    object  array  my property   gt   value     Now you can reach it like   echo  a- gt foo     returns bar

User · Answer

Interesting    You declared an array  var  my value   array    Pushed value into it     a- gt my value      b   Assigned a string to variable   so it is no more array   a- gt set value   c    Tried to push a value into array  that does not exist anymore   it s string   a- gt my class  d      And your foreach wont work anymore

User · Answer

I realise this answer is not a direct response to the problem described by the OP  but I found this question as a result of searching for the same error message  I thought it worth posting my experience here just in case anybody is muddling over the same thing     You can encounter the error in question as a result of a poorly formatted for loop over an associative array  In a fit of bone-headedness  I was using -  instead of    in my for statement           foreach   object- gt someArray as  key- gt  val                   do something             Of course  I should have had           foreach   object- gt someArray as  key  gt  val                   do something             I confused myself at first  thinking the reported error was referring to the someArray property

User · Answer

To access a variable in a class  you must use  this- gt myVar instead of  this- gt  myvar   And  you should use access identifier to declare a variable instead of var   Please read the doc here

[php] PHP Fatal error: Cannot access empty property

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