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  1. <?php
  2. $a = array(1);
  3. function func(&$arr)
  4. {
  5.   $ref = &$arr[0];
  6.   echo "in func\n";
  7.   // xdebug_debug_zval('arr');
  8.   var_dump($arr);
  9.   return $arr;
  10. }
  11. func($a);
  12. $b = $a;
  13. $b[0] = '!';
  14. echo "refed by another scope\n";
  15. // xdebug_debug_zval('a');
  16. var_dump($a);
  17. $b = func($a);
  18. $b[0] = '!';
  19. echo "copy func return refed var\n";
  20. // xdebug_debug_zval('a');
  21. var_dump($a);
  22.  
  23. $a = array(1);
  24. $ref = &$a[0];
  25. $aa = &$a;
  26. $b = $aa;
  27. $b[0] = '!';
  28. echo "refed same scope\n";
  29. // xdebug_debug_zval('a');
  30. var_dump($a);
  31.  
Success #stdin #stdout 0.01s 20568KB
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stdout
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in func
array(1) {
  [0]=>
  &int(1)
}
refed by another scope
array(1) {
  [0]=>
  int(1)
}
in func
array(1) {
  [0]=>
  &int(1)
}
copy func return refed var
array(1) {
  [0]=>
  &string(1) "!"
}
refed same scope
array(1) {
  [0]=>
  &string(1) "!"
}
https://ideone.com/iZuBDI
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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