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array_diff_ukey()

array_diff_ukey - Computes the difference of arrays using a callback function on the keys for comparison

Syntax

array array_diff_ukey (array $array1, array $array2, array $ ..., callback $key_compare_func)

Arguments

  • array1 - The array to compare from
  • array2 - An array to compare against
  • ... - More arrays to compare against
  • key_compare_func - callback function to use. The callback function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

Description

Compares the keys from array1 against the keys from array2 and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.

Version

PHP 5.1.0

Return value

Returns an array containing all the entries from array1 that are not present in any of the other arrays.