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POCompare two arrays based on the first N elements of the array PHP
 

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  1. POCompare two arrays based on the first N elements of the array PHP
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    <p>I am trying to turn compare two arrays based on the first three elements of each array. I will then use <code>array_udiff</code> to find elements in the first original array that arent in the second original array. Here is my code and current outputs</p> <pre><code>function udiffanswers($a,$b){ $slicea = array_slice($a,0,3); $sliceb = array_slice($b,0,3); print_r($slicea); print_r($sliceb); if($slicea == $sliceb) { return 0; }else{ return -1; } } $diffinanswers = array_udiff($row ,$answers, 'udiffanswers'); echo "diff results \n"; print_r($diffinanswers); </code></pre> <p>THIS IS MY INPUT</p> <pre><code> answers sqlite results Array ( [0] =&gt; Array ( [aid] =&gt; 432267 [qid] =&gt; 0 [sid] =&gt; 1 [freetext] =&gt; [a] =&gt; Dog [b] =&gt; null 1 [c] =&gt; null 2 [d] =&gt; null 3 [e] =&gt; null 4 [f] =&gt; null 5 [g] =&gt; null 6 [h] =&gt; null 7 [i] =&gt; null 8 [j] =&gt; null 9 [type] =&gt; Multiple Choice [location] =&gt; 37.334709,-122.034111 ) [1] =&gt; Array ( [aid] =&gt; 1 [qid] =&gt; 0 [sid] =&gt; 1 [freetext] =&gt; [a] =&gt; Dog [b] =&gt; null 1 [c] =&gt; null 2 [d] =&gt; null 3 [e] =&gt; null 4 [f] =&gt; null 5 [g] =&gt; null 6 [h] =&gt; null 7 [i] =&gt; null 8 [j] =&gt; null 9 [type] =&gt; Multiple Choice [location] =&gt; 37.334709,-122.034111 ) ) </code></pre> <p>answers mysqli results </p> <pre><code> Array ( [0] =&gt; Array ( [aid] =&gt; 42 [qid] =&gt; 0 [sid] =&gt; 1 [freetext] =&gt; [a] =&gt; dog [b] =&gt; [c] =&gt; [d] =&gt; [e] =&gt; [f] =&gt; [g] =&gt; [h] =&gt; [i] =&gt; [j] =&gt; [type] =&gt; [location] =&gt; ) [1] =&gt; Array ( [aid] =&gt; 432267 [qid] =&gt; 0 [sid] =&gt; 1 [freetext] =&gt; [a] =&gt; Dog [b] =&gt; null 1 [c] =&gt; null 2 [d] =&gt; null 3 [e] =&gt; null 4 [f] =&gt; null 5 [g] =&gt; null 6 [h] =&gt; null 7 [i] =&gt; null 8 [j] =&gt; null 9 [type] =&gt; Multiple Choice [location] =&gt; 37.334709,-122.034111 ) [2] =&gt; Array ( [aid] =&gt; 432267 [qid] =&gt; 0 [sid] =&gt; 2 [freetext] =&gt; [a] =&gt; dog [b] =&gt; [c] =&gt; [d] =&gt; [e] =&gt; [f] =&gt; [g] =&gt; [h] =&gt; [i] =&gt; [j] =&gt; [type] =&gt; [location] =&gt; ) [3] =&gt; Array ( [aid] =&gt; 432267 [qid] =&gt; 2 [sid] =&gt; 1 [freetext] =&gt; [a] =&gt; dog [b] =&gt; [c] =&gt; [d] =&gt; [e] =&gt; [f] =&gt; [g] =&gt; [h] =&gt; [i] =&gt; [j] =&gt; [type] =&gt; [location] =&gt; ) ) </code></pre> <p>THIS IS THE OUTPUT(but should only contain array[1])</p> <pre><code> [0] =&gt; Array ( [aid] =&gt; 432267 [qid] =&gt; 0 [sid] =&gt; 1 [freetext] =&gt; [a] =&gt; Dog [b] =&gt; null 1 [c] =&gt; null 2 [d] =&gt; null 3 [e] =&gt; null 4 [f] =&gt; null 5 [g] =&gt; null 6 [h] =&gt; null 7 [i] =&gt; null 8 [j] =&gt; null 9 [type] =&gt; Multiple Choice [location] =&gt; 37.334709,-122.034111 ) [1] =&gt; Array ( [aid] =&gt; 1 [qid] =&gt; 0 [sid] =&gt; 1 [freetext] =&gt; [a] =&gt; Dog [b] =&gt; null 1 [c] =&gt; null 2 [d] =&gt; null 3 [e] =&gt; null 4 [f] =&gt; null 5 [g] =&gt; null 6 [h] =&gt; null 7 [i] =&gt; null 8 [j] =&gt; null 9 [type] =&gt; Multiple Choice [location] =&gt; 37.334709,-122.034111 ) ) </code></pre> <p>but it is. Im pretty sure the udiff function is not correct but cant figure it out. I only want the unique ones in the sqlite array to be output</p>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USWilliam Brasky
    1. USWilliam Brasky
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COCould you edit your question to explicitly state your input, output, and expected output?
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      1. POCompare two arrays based on the first N elements of the array PHP
      1. USkba
    2. COHave you tried `array_diff` instead if `array_udiff`?
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      1. POCompare two arrays based on the first N elements of the array PHP
      1. USDevlshOne
    3. COwould array_diff work when i only care about the first 3 elements? the next elements are allowed to be different/same
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      1. POCompare two arrays based on the first N elements of the array PHP
      1. USWilliam Brasky
 

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