Will copy-on-write prevent data duplication on arrays?

by

Copy on write as the name suggests means no variable is being copied until something is written; as long as not a single byte is changed in the variable passed around, PHP takes care of avoiding unnecesary duplicates automatically and without the need of using explicit references thanks to this mechanism.

This article explains in detail how is this implemented in the source code of PHP, and as the article suggests, using xdebug one can easily check the variables are not being duplicated with the function xdebug_debug_zval.

Additionally this answer here on SO has more on Copy-on-Write.

More Related Contents:

  1. count how many duplicate keys are in array of objects?
  2. php: check if an array has duplicates
  3. Get the keys for duplicate values in an array
  4. How to allow duplicate keys in php array [duplicate]
  5. Remove duplicate items from an array [duplicate]
  6. Return only duplicated entries from an array (case-insensitive)
  7. Isolate comma-separated values, remove duplicates and empty values, then sort
  8. Combine two 2d arrays and have duplicate rows removed
  9. How to count the consecutive duplicate values in an array?
  10. PHP: Check for duplicate values in a multidimensional array
  11. How to search by key=>value in a multidimensional array in PHP
  12. php $_POST array empty upon form submission
  13. How to check if PHP array is associative or sequential?
  14. What is the best way to loop through this array in PHP?
  15. mysqli bind_param() expected to be a reference, value given
  16. What’s the best way to get the last element of an array without deleting it?
  17. Convert a comma-delimited string into array of integers?
  18. Convert array into csv
  19. Search for a key in an array, recursively
  20. Get the first N elements of an array?
  21. php var_dump() vs print_r()
  22. How to get common values from two different arrays in PHP [closed]
  23. Comment associative array in PHP Documentor
  24. What is the meaning of [] [closed]
  25. Get the maximum value from an element in a multidimensional array? [duplicate]
  26. Returning first x items from array
  27. What is the difference between array_udiff_assoc() and array_diff_uassoc()?
  28. How do I declare a two dimensional array?
  29. PHP convert nested array to single array while concatenating keys?
  30. Group array data on one column and sum data from another column to form a flat associative array

Leave a Comment