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POSorting multidimensional array on each level separately
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/12900539/how-to-sort-the-following-php-multidimensional-array">How to sort the following PHP multidimensional array?</a> </p> </blockquote> <p>Let's say I have following array:</p> <pre><code>Array ( [0] =&gt; Array ( [id] =&gt; 5 [name] =&gt; Education [parent] =&gt; 1 [sort_order] =&gt; 3 [leaf] =&gt; 1 ) [1] =&gt; Array ( [id] =&gt; 6 [name] =&gt; Computers [parent] =&gt; 1 [sort_order] =&gt; 1 [leaf] =&gt; 1 ) [2] =&gt; Array ( [id] =&gt; 7 [name] =&gt; Science [parent] =&gt; 1 [sort_order] =&gt; 2 [children] =&gt; Array ( [0] =&gt; Array ( [id] =&gt; 8 [name] =&gt; Mathematics [parent] =&gt; 7 [sort_order] =&gt; 2 [children] =&gt; Array ( [0] =&gt; Array ( [id] =&gt; 11 [name] =&gt; Geometry [parent] =&gt; 8 [sort_order] =&gt; 2 [leaf] =&gt; 1 ) [1] =&gt; Array ( [id] =&gt; 12 [name] =&gt; Algebra [parent] =&gt; 8 [sort_order] =&gt; 1 [leaf] =&gt; 1 ) ) ) [1] =&gt; Array ( [id] =&gt; 9 [name] =&gt; Physics [parent] =&gt; 7 [sort_order] =&gt; 1 [leaf] =&gt; 1 ) [2] =&gt; Array ( [id] =&gt; 10 [name] =&gt; Biology [parent] =&gt; 7 [sort_order] =&gt; 4 [leaf] =&gt; 1 ) [3] =&gt; Array ( [id] =&gt; 13 [name] =&gt; History [parent] =&gt; 7 [sort_order] =&gt; 3 [leaf] =&gt; 1 ) ) ) </code></pre> <p>Is there any PHP built-in function which will sort this array separately on each level by <code>'sort_order'</code> value? I have found several sollutions, but all of them sorted alphabetically or have used ksort().</p> <p>There will be recursion needed probably, but I need some help how to start that. TIA.</p>
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    1. COWhat should happen for duplicate cases? Do you not like alphabetical because 10 will come before 2, or what?
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    2. CO@Ally I am preventing duplicate cases. `sort_order` on each level is unique.
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    3. COpossible duplicate of [How to sort the following PHP multidimensional array?](http://stackoverflow.com/questions/12900539/how-to-sort-the-following-php-multidimensional-array) or http://stackoverflow.com/questions/10998830/sort-php-multidimensional-array-by-value or http://stackoverflow.com/questions/13613286/sorting-a-big-multidimensional-array or http://stackoverflow.com/questions/13148243/sort-multi-dimensional-array-php or http://stackoverflow.com/questions/12006771/sort-multi-dimensional-array,http://stackoverflow.com/questions/12450304/sort-multidimensional-array-data-into-numerical-orde
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