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POHow do I use array_udiff() correctly?
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  1. POHow do I use array_udiff() correctly?
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    copied!<p>I have two multidimensional arrays that both look something like this:</p> <pre><code>Array ( [0] =&gt; Array ( 'id' =&gt; 3, 'other' =&gt; 'some string', 'timestamp' =&gt; 2000-01-01 00:00:00 ), [1] =&gt; Array ( 'id' =&gt; 6, 'other' =&gt; 'another string', 'timestamp' =&gt; 1835-01-01 00:00:00 ) ) </code></pre> <p>I'm trying to find a way to figure out which elements show up in one array (<code>$b</code>), but not the other (<code>$a</code>) and if there are any elements with changed values. If <code>$a</code> is:</p> <pre><code>Array ( [0] =&gt; Array ( 'id' =&gt; 3, 'other' =&gt; 'some string', 'timestamp' =&gt; 2000-01-01 00:00:00 ) ) </code></pre> <p>and <code>$b</code> is:</p> <pre><code>Array ( [0] =&gt; Array ( 'id' =&gt; 3, 'other' =&gt; 'some string', 'timestamp' =&gt; 2000-01-01 12:12:12 ), [1] =&gt; Array ( 'id' =&gt; 4, 'other' =&gt; 'some string', 'timestamp' =&gt; 1900-01-01 01:12:23 ) ) </code></pre> <p>Then the function should return:</p> <pre><code>Array ( [0] =&gt; Array ( 'id' =&gt; 3, 'other' =&gt; 'some string', 'timestamp' =&gt; 2000-01-01 12:12:12 ), [1] =&gt; Array ( 'id' =&gt; 4, 'other' =&gt; 'some string', 'timestamp' =&gt; 1900-01-01 01:12:23 ) ) </code></pre> <p>because the element with <code>id = 3</code> has been changed (the <code>timestamp</code> field) and the element with <code>id = 4</code> is new and doesn't appear in the other array.</p> <p>I've been trying to do this with <code>array_udiff</code>, but I still don't know how it works (it seems to sort both arrays first, but then how does it do comparison?). Is <code>array_udiff</code> the proper method or should I write a custom function?</p>
 

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