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Using the unset() function in PHP to delete an array and rebuild the index_PHP Tutorial

WBOY
WBOYOriginal
2016-07-13 17:14:501029browse

We have many ways to delete an array element in PHP, but the most commonly used one is to use the unset function. But how do we rebuild the array index after deleting the middle array element? Please refer to it below.

The code is as follows
 代码如下 复制代码

$arr = array(1,2,3,4);
unset($arr[1]);
echo $array[1]; // error Undefined offset
print_r($arr);

// 输出如下
/**
Array
(
    [0] => 1
    [2] => 3
    [3] => 4
)
**/
$arr = array_values($arr);
print_r($arr);
// 输出如下
/**
Array
(
    [0] => 1
    [1] => 3
    [2] => 4
)
**/

Copy code
$arr = array(1,2,3,4);
unset($arr[1]);
echo $array[1]; // error Undefined offset
print_r($arr);

//The output is as follows
/**
Array
(
    [0] => 1
    [2] => 3
    [3] => 4
)
**/
$arr = array_values($arr);
print_r($arr);
//The output is as follows
/**
Array
(
    [0] => 1
    [1] => 3
    [2] => 4
)
**/

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