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<?php

/**

* Copyright (C) 2011-2017 by Lars Strojny <lstrojny@php.net>

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

namespace Functional;

/**

* Returns a comparison function that can be used with e.g. `usort()`

*

* @param callable $comparison A function that compares the two values. Pick e.g. strcmp() or strnatcasecmp()

* @param callable $keyFunction A function that takes an argument and returns the value that should be compared

* @return callable

*/

function compare_object_hash_on(callable $comparison, callable $keyFunction = null)

{

$keyFunction = $keyFunction ? compose($keyFunction, 'spl_object_hash') : 'spl_object_hash';

return compare_on($comparison, $keyFunction);

}