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array_keys()

array_keys - Return all the keys of an array

Syntax

array array_keys (array $input, mixed $search_value, bool $strict)

Arguments

  • input - An array containing keys to return.
  • search_value - If specified, then only keys containing these values are returned.
  • strict - Determines if strict comparison (===) should be used during the search.

Description

array_keys() returns the keys, numeric and string, from the input array.

Version

PHP 4, 5

Return value

Returns an array of all the keys in input.