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Two ways to delete array elements in php. Differences in usage of unset and array_splice

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2016-07-25 08:52:561216browse
  2. $arr = array('a','b','c','d');
  3. unset($arr[1]);
  4. print_r($arr);
  5. ?>
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Results: Array ( [0] => a [2] => c [3] => d ) How can the missing elements be filled and the array re-indexed? The answer is array_splice():

Example:

  2. $arr = array('a','b','c','d');
  3. array_splice($arr,1,1);
  4. print_r($arr) ;
  5. ?>
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Result: Array ( [0] => a [1] => c [2] => d ) Delete specific elements in the array (bbs.it-home.org Scripting School):

  2. $arr2 = array(1,3, 5,7,8);
  3. foreach ($arr2 as $key=>$value)
  4. {
  5. if ($value == = 3)
  6. unset($arr2[$key]);
  7. }
  8. var_dump($arr2);
  9. ?>
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Delete empty arrays:

  2. $array = ('a' => "abc", 'b' => "bcd",'c' =>"cde",'d' => ;"def",'e'=>"");
  3. array_filter($array);
  4. echo "
    ";
  5. print_r($array);
  6. ?>
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result: Array ( [a] => abc => bcd [c] => cde [d] => def )

Summary: If the array_splice() function is deleted, the index value of the array will also change. If the unset() function deletes it, the index value of the array will not change.



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