PHP - warning - Undefined property stdClass - fix

Question

I get this warning in my error logs and wanted to know how to correct this issues in my code   Warning  PHP Notice   Undefined property   stdClass   records in script php on line 440  Some Code      Parse object to get account id s    The response doesn t have the records attribute sometimes   role arr   getRole  response- gt records       Line 440    Response if records exists  stdClass Object        done    gt  1      queryLocator    gt       records    gt  Array                        0    gt  stdClass Object                                        type    gt  User                      Id    gt                       any    gt  stdClass Object                                                        type    gt  My Role                              Id    gt                               any    gt   lt sf Name gt My Name lt  sf Name gt                                                                size    gt  1     Response if records does not exist  stdClass Object        done    gt  1      queryLocator    gt       size    gt  0     I was thinking something like array key exists   functionality but for objects  anything  or am I going about this the wrong way

User · Answer

Error control operator  In case the warning is expected you can use the error control operator   to suppress thrown messages    role arr   getRole   response- gt records     While this reduces clutter in your code you should use it with caution as it may make debugging future errors harder  An example where using   may be useful is when creating an object from user input and running it through a validation method before using it in further logic     Null Coalesce Operator  Another alternative is using the isset ternary operator     This allows you to avoid warnings and assign default value in a short one line fashion    role arr   getRole  response- gt records    null

User · Answer

The response itself seems to have the size of the records  You can use that to check if records exist  Something like   if  response- gt size  gt  0        role arr   getRole  response- gt records

User · Answer

You can use property exists http   www php net manual en function property-exists php

User · Answer

If think this will work   if sizeof  response- gt records  gt 0   role arr   getRole  response- gt records     newly defined proprties included too

User · Answer

Depending on whether you re looking for a member or method  you can use either of these two functions to see if a member method exists in a particular object    http   php net manual en function method-exists php  http   php net manual en function property-exists php  More generally if you want all of them    http   php net manual en function get-object-vars php

User · Answer

If you want to use property exists  you ll need to get the name of the class with get class    In this case it would be     if  property exists  get class  response    records               role arr   getRole  response- gt records       else

User · Answer

isset   is fine for top level  but empty   is much more useful to find whether nested values are set  Eg   if isset  json  foo    amp  amp  isset  json  foo    bar            value    json  foo    bar       Or   if   empty  json  foo    bar           value    json  foo    bar

User · Answer

In this case  I would use   if   empty  response- gt records         do something     You won t get any ugly notices if the property doesn t exist  and you ll know you ve actually got some records to work with  ie   response- records is not an empty array  NULL  FALSE  or any other empty values

User · Answer

if isset  response- gt records       print  we ve got records

[php] PHP - warning - Undefined property: stdClass - fix?

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