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

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Release： 2016-07-25 08:52:56

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$arr = array('a','b','c','d');
unset($arr[1]);
print_r($arr);
?>

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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:

$arr = array('a','b','c','d');
array_splice($arr,1,1);
print_r($arr) ;
?>

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Result: Array ( [0] => a [1] => c [2] => d ) Delete specific elements in the array (bbs.it-home.org Scripting School):

$arr2 = array(1,3, 5,7,8);
foreach ($arr2 as $key=>$value)
{
if ($value == = 3)
unset($arr2[$key]);
}
var_dump($arr2);
?>

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Delete empty arrays:

$array = ('a' => "abc", 'b' => "bcd",'c' =>"cde",'d' => ;"def",'e'=>"");
array_filter($array);
echo "
```
";
```
print_r($array);
?>

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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.

Related labels：

php删除数组元素的二种方法 unset array_splice用法区别

source：php.cn

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