Web Reference: array_keys () returns the keys, numeric and string, from the array. If a filter_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned. May 10, 2022 · So now you can use the same function for multiple arrays with different numbers of nested key pairs, you just need to pass in an array of key names to use as replacements. Definition and Usage The array_keys () function returns an array containing the keys.
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