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    <p><a href="http://docs.php.net/array_udiff" rel="nofollow">http://docs.php.net/array_udiff</a>:<blockquote>The user supplied callback function is used for comparison. It must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second. </blockquote>Your function always returns 1 if the elements are unequal which results in diffrent (wrong) comparisons decisions.</p> <pre><code>&lt;?php function epsilon_compare ($v1,$v2) { $epsilon = 0.02; $diff = $v1 - $v2; return abs($diff)&lt;=$epsilon ? 0 : $diff; } $db_values = array( "21" =&gt; 10.00, "22" =&gt; 20.00, "25" =&gt; 3.55); $post_values = array( "21" =&gt; 8.00, "22" =&gt; 20.01, "25" =&gt; 2.55 ); print_r(array_udiff($post_values, $db_values, "epsilon_compare")); </code></pre> <p>prints</p> <pre><code>Array ( [21] =&gt; 8 [25] =&gt; 2.55 ) </code></pre> <hr> <p>edit: using array_udiff_assoc</p> <pre><code>$db_values = array ( "1" =&gt; 7.55, "2" =&gt; 5.45, "3" =&gt; 5.45, "4" =&gt; 64.45, "5" =&gt; 54.75, "6" =&gt; 30.40, "7" =&gt; 56.99, "8" =&gt; 10.90, "9" =&gt; 60.85, "11" =&gt; 3.25, "12" =&gt; 13.05, "13" =&gt; 5.45, "14" =&gt; 8.00, "15" =&gt; 5.45, "16" =&gt; 13.05, "17" =&gt; 4.35 ); $post_values = array ( "1" =&gt; 7.55, "2" =&gt; 5.45, "3" =&gt; 5.45, "4" =&gt; 64.45, "5" =&gt; 54.75, "6" =&gt; 30.40, "7" =&gt; 56.99, "8" =&gt; 10.90, "9" =&gt; 60.85, "11" =&gt; 3.25, "12" =&gt; 13.05, "13" =&gt; 2.45, "14" =&gt; 8.00, "15" =&gt; 5.45, "16" =&gt; 12.05, "17" =&gt; 2.34 ); print_r(array_udiff_assoc($post_values, $db_values, "epsilon_compare")); </code></pre> <p>prints</p> <pre><code>Array ( [13] =&gt; 2.45 [16] =&gt; 12.05 [17] =&gt; 2.34 ) </code></pre>
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    1. POphp array_udiff to compare array values with threshold (tolerance)
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    1. POphp array_udiff to compare array values with threshold (tolerance)
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    1. COwhat would you say about Dennis comment that "udiff" makes more comparisons that is in this case needed?
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    2. CO`$db_values = array ( "1" => 7.55, "2" => 5.45, "3" => 5.45, "4" => 64.45, "5" => 54.75, "6" => 30.40, "7" => 56.99, "8" => 10.90, "9" => 60.85, "11" => 3.25, "12" => 13.05, "13" => 5.45, "14" => 8.00, "15" => 5.45, "16" => 13.05, "17" => 4.35 );` `$post_values = array ( "1" => 7.55, "2" => 5.45, "3" => 5.45, "4" => 64.45, "5" => 54.75, "6" => 30.40, "7" => 56.99, "8" => 10.90, "9" => 60.85, "11" => 3.25, "12" => 13.05, "13" => 2.45, "14" => 8.00, "15" => 5.45, "16" => 12.05, "17" => 2.34 );` If you use above two arrays, the result is incorrect (only 16=>12.05).
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    3. COThat's how array_udiff works. `Returns an array containing all the values of array1 that are not present in any of the other arguments.` For other results you have to specify/explain the rules...
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