PHP - Modify current object in foreach loop

Question

I was wondering if it is possible to edit the current object that s being handled within a foreach loop  I m working with an array of objects  questions and I want to go through and look for the answers associated with that question object in my db  So for each question go fetch the answer objects and update the current  question inside my foreach loop so I can output process elsewhere   foreach  questions as  question        question  answers      answers model- gt get answers by question id  question  question id

User · Accepted Answer

There are 2 ways of doing this  foreach  questions as  key   gt   question        questions  key   answers      answers model- gt get answers by question id  question  question id         This way you save the key  so you can update it again in the main  questions variable  or  foreach  questions as  amp  question     Adding the  amp  will keep the  questions updated  But I would say the first one is recommended even though this is shorter  see comment by Paystey   Per the PHP foreach documentation      In order to be able to directly modify array elements within the loop precede  value with  amp   In that case the value will be assigned by reference

User · Answer

Surely using array map and if using a container implementing ArrayAccess to derive objects is just a smarter  semantic way to go about this   Array map semantics are similar across most languages and implementations that I ve seen  It s designed to return a modified array based upon input array element  high level ignoring language compile runtime type preference   a loop is meant to perform more logic   For retrieving objects by ID   PK  depending upon if you are using SQL or not  it seems suggested   I d use a filter to ensure I get an array of valid PK s  then implode with comma and place into an SQL IN   clause to return the result-set  It makes one call instead of several via SQL  optimising a bit of the call- gt wait cycle  Most importantly my code would read well to someone from any language with a degree of competence and we don t run into mutability problems    lt  php   arr    0 1 2 3 4    arr2   array map function  value    return is int  value     value 2    value      arr   var dump  arr   var dump  arr2     vs   lt  php   arr    0 1 2 3 4   foreach  arr as  i   gt   item         arr  i    is int  item     item   2    item    var dump  arr     If you know what you are doing will never have mutability problems  bearing in mind if you intend upon overwriting  arr you could always  arr   array map and be explicit

[php] PHP - Modify current object in foreach loop

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