PHP unset,array_splice Remove the difference between elements in an array _php tutorial

Unset,array_splice in PHP removes the difference between elements in an array

It is very simple to delete an array element in PHP, but sometimes deleting an array requires some ordering of the index and we will use the relevant function, here we introduce the use of Unset,array_splice to delete the elements in the array of differences

If you want to delete an element in an array, you can use the unset directly, but the index of the array does not reflow:

　　

$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 the missing elements be filled and the array will be re-indexed? The answer is Array_splice ():

　　

$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 a specific element in an array

　　

$arr 2 = Array (1, 3, 5,7,8);

foreach ($arr 2 as $key = $value)

{

if ($value = = = 3)

unset ($arr 2[$key]);

}

Var_dump ($arr 2);

?>

Supplemental Delete Empty Array

Instance:

　　

$array = (' a ' + = ' abc ', ' B ' + = ' bcd ', ' c ' = ' CDE ', ' d ' and ' Def ', ' e ' = ' = ') ';

Array_filter ($array);

echo "

";
Print_r ($array);
?>
Results:
Array (
[A] = ABC
[B] = BCD
[C] = CDE
[d] = def
)
Summarize
If the Array_splice () function is deleted, the index value of the array also changes.
If the unset () function is removed, the index value of the array does not change.

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