How to re-index deleted elements in php array, php array element index_PHP tutorial

How to re-index deleted elements in php array, php array element index

If you want to delete an element in an array, you can directly use unset, but what I saw today surprised me

Copy code The code is as follows:

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

After print_r($arr), the result is not like that. The final result is Array ( [0] => a [2] => c [3] => d )

So how can the missing elements be filled and the array re-indexed? The answer is

array_splice():

Copy code The code is as follows:

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

After print_r($arr), the result is A(www.jb51.net)rray ( [0] => a [1] => c [2] => d )

Delete the specified element from the array

array_search() is more practical

The array_search() function is the same as in_array(), searching for a key value in the array. If the value is found, the key of the matching element is returned. If not found, return false

Copy code The code is as follows:

$array = array('1', '2', '3', '4', '5');
$del_value = 3;
unset($array[array_search($del_value, $array)]);//Use unset to delete this element
print_r($array);

Output
array('1', '2', '4', '5');

But if you want to re-index the array, you need to use foreach to traverse the deleted array and then re-create an array. This is also possible.

How to delete the array key value in php and turn it into an index array

array_values() returns all the values ​​in the input array and indexes them numerically.

array_value($arr['date']);

After php deletes a specified item in the two-dimensional array, the index is still arranged in order?

Solution 1: Create a new array:

$newArr = array();

foreach($arr as $key=>$value){
$newArr[] = $value ;

}

Solution 2: Sort
sort($arr);

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