What is the max key size for an array in PHP?

It seems to be limited only by the script’s memory limit.

A quick test got me a key of 128mb no problem:

ini_set('memory_limit', '1024M');

$key = str_repeat('x', 1024 * 1024 * 128);

$foo = array($key => $key);

echo strlen(key($foo)) . "<br>";
echo strlen($foo[$key]) . "<br>";

Related Contents:

  1. Filter array by its keys using an array of allowed keys
  2. How to combine two arrays together?
  3. How to re-index the values of an array in PHP? [duplicate]
  4. Characters allowed in php array keys?
  5. Replace keys in an array based on another lookup/mapping array
  6. Remove all elements from array that do not start with a certain string
  7. How to filter an associative arrays using keys of an indexed array in PHP?
  8. Add elements to array which has gapped numeric keys to form an indexed array / list
  9. How to filter an associative array comparing keys with values in an indexed array?
  10. How to access first level keys of a 2d array with a foreach loop? [duplicate]
  11. Is there a way to change all keys in a flat indexed array to the same string (“Name”)?
  12. Get the keys for duplicate values in an array
  13. How to find array / dictionary value using key?
  14. PHP – Find parent key of array
  15. Custom key-sort a flat associative based on another array
  16. How to order “zebra” array so each key has an alternate value (either 1, 0)
  17. Deleting an element from an array in PHP
  18. Convert a PHP object to an associative array
  19. Sort an Array by keys based on another Array?
  20. PHP in_array() / array_search() odd behaviour
  21. Convert multidimensional array into single array
  22. Array to String PHP?
  23. Pass Javascript Array -> PHP
  24. Count number of values in array with a given value
  25. Sorting a php array of arrays by custom order
  26. What is so wrong with extract()?
  27. PHP sort array by two field values [duplicate]
  28. How to get random value out of an array?
  29. Search for a key in an array, recursively
  30. How to get last key in an array?
  31. Read each line of txt file to new array element
  32. in_array multiple values
  33. Associative array, sum values of the same key
  34. Strange behavior of foreach when using reference: foreach ($a as &$v) { … }
  35. Convert flat array to a delimited string to be saved in the database
  36. A formula to find prime numbers in a loop
  37. Array as session variable
  38. PHP: Get the key from an array in a foreach loop [duplicate]
  39. Merge two arrays containing objects and remove duplicate values
  40. PHP merge arrays by value
  41. Group 2d array data using column value to create a 3d array
  42. PHP – Get key name of array value
  43. Merging two arrays with the “+” (array union operator) How does it work?
  44. Find number which is greater than or equal to N in an array
  45. How to explode only on the last occurring delimiter?
  46. Algorithm to get all possible string combinations from array up to certain length
  47. Warning: array_combine(): Both parameters should have an equal number of elements
  48. MySQL PHP – SELECT WHERE id = array()? [duplicate]
  49. Loop a multidimensional array and only print two specific column values per row
  50. Print the keys of an array

Leave a Comment