[wp-trac] [WordPress Trac] #42412: Calling get_current_user_id() and setting $current_user gives unexpected behaviour

[WordPress Trac]

#42412: Calling get_current_user_id() and setting $current_user gives unexpected
behaviour
--------------------------+-----------------------------
 Reporter:  gertmeeusen   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  4.8.3
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 Steps to reproduce, paste this code in functions.php
 {{{#!php
 <?php
 if ( ! function_exists( 'wp_get_current_user' ) ) {
     die('The file with wp_get_current_user() has not loaded yet into
 memory.');
 }else{

     echo '----echo get_current_user_id()----</br>';

     echo '$current_user global? ';
     echo array_key_exists('current_user',
 $GLOBALS)?"true</br>":"false</br>";

     echo get_current_user_id() . '</br>';

     echo '$current_user global? ';
     echo array_key_exists('current_user',
 $GLOBALS)?"true</br>":"false</br>";

     echo get_current_user_id() . '</br>';
     echo get_current_user_id() . '</br>';

     echo '----echo $current_user after 1 call----</br>';
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     echo $current_user . '</br>';
     echo $current_user . '</br>';

     echo '----echo $current_user, 1 call each time----</br>';
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = get_current_user_id();
     echo $current_user . '</br>';

     echo '----echo $current_user, $current_user = 5 before each
 call----</br>';
     $current_user = 5;
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = 5;
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = 5;
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = 5;
     $current_user = get_current_user_id();
     echo $current_user . '</br>';
     $current_user = 5;
     $current_user = get_current_user_id();
     echo $current_user . '</br>';

     echo '----echo $current_user, $current_user = 5 NO call----</br>';
     $current_user = 5;
     echo $current_user . '</br>';
     $current_user = 5;
     echo $current_user . '</br>';
     $current_user = 5;
     echo $current_user . '</br>';
     $current_user = 5;
     echo $current_user . '</br>';
     $current_user = 5;
     echo $current_user . '</br>';

     echo '----echo $cu, 1 call each time---</br>';
     $cu = get_current_user_id();
     echo $cu . '</br>';
     $cu = get_current_user_id();
     echo $cu . '</br>';
     $cu = get_current_user_id();
     echo $cu . '</br>';
     $cu = get_current_user_id();
     echo $cu . '</br>';

     echo '----echo $current_user_1, 1 call each time----</br>';
     $current_user_1 = get_current_user_id();
     echo $current_user_1 . '</br>';
     $current_user_1 = get_current_user_id();
     echo $current_user_1 . '</br>';
     $current_user_1 = get_current_user_id();
     echo $current_user_1 . '</br>';
     $current_user_1 = get_current_user_id();
     echo $current_user_1 . '</br>';


     echo '----echo $current_user->ID ----</br>';
     $current_user = wp_get_current_user();
     echo $current_user->ID . '</br>';
     $current_user = wp_get_current_user();
     echo $current_user->ID . '</br>';
     $current_user = wp_get_current_user();
     echo $current_user->ID . '</br>';
     $current_user = wp_get_current_user();
     echo $current_user->ID . '</br>';

     echo '----echo $current_user_obj->ID ----</br>';
     $current_user_obj = wp_get_current_user();
     echo $current_user_obj->ID . '</br>';
     $current_user_obj = wp_get_current_user();
     echo $current_user_obj->ID . '</br>';
     $current_user_obj = wp_get_current_user();
     echo $current_user_obj->ID . '</br>';
     $current_user_obj = wp_get_current_user();
     echo $current_user_obj->ID . '</br>';
 }
 }}}

 That outputs:

 {{{
 ----echo get_current_user_id()----
 $current_user global? false
 1
 $current_user global? true
 1
 1
 ----echo $current_user after 1 call----
 1
 1
 1
 ----echo $current_user, 1 call each time----
 0
 1
 0
 1
 0
 ----echo $current_user, $current_user = 5 before each call----
 0
 0
 0
 0
 0
 ----echo $current_user, $current_user = 5 NO call----
 5
 5
 5
 5
 5
 ----echo $cu, 1 call each time---
 0
 0
 0
 0
 ----echo $current_user_1, 1 call each time----
 0
 0
 0
 0
 ----echo $current_user->ID ----
 0
 0
 0
 0
 ----echo $current_user_obj->ID ----
 0
 0
 0
 0
 }}}

 Issue in _wp_get_current_user() ?

 Using php 7.0

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Ticket URL: <https://core.trac.wordpress.org/ticket/42412>
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