Differences between unset and array_splice in PHP to delete elements in the array

If you want to delete an element from an array, you can use unset directly, but the index of the array will not be rearranged:

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<? Php $ Arr = array ('A', 'B', 'C', 'D '); Unset ($ arr [1]); Print_r ($ arr ); ?> The result is: Array ([0] => a [2] => c [3] => d)

 
So how can we fill in the missing elements and re-index the array? The answer is array_splice ():

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<? Php $ Arr = array ('A', 'B', 'C', 'D '); Array_splice ($ arr, 1, 1 ); Print_r ($ arr ); ?> The result is: Array ([0] => a [1] => c [2] => d)

 
Delete special elements in an array

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<? Php $ Arr2 = array (1, 3, 5, 7, 8 ); Foreach ($ arr2 as $ key => $ value) { If ($ value = 3) Unset ($ arr2 [$ key]); } Var_dump ($ arr2 ); ?>

Add or delete an empty array

Instance:

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<? Php $ Array = ('a' => "abc", 'B' => "bcd", 'C' => "cde", 'D' => "def ", 'E' => ""); Array_filter ($ array ); Echo "<pre> "; Print_r ($ array ); ?> Result: Array ( [A] => abc [B] => bcd [C] => cde [D] => def ) Summary

If the array_splice () function is deleted, the index value of the array also changes.
If the unset () function is deleted, the index value of the array remains unchanged.