php remove last key from array

In PHP development, we often need to operate on arrays. Sometimes, we need to delete the last element in an array. Although PHP provides many functions for manipulating arrays, there is no dedicated function that can delete the last element in an array. However, we can use some tricks to achieve this functionality.

Method 1: Use the array_pop function
We can use the array_pop function to delete the last element in the array. This function removes the last element of the array from the array and returns the value of that element. We just need to ignore the return value.

The sample code is as follows:

<?php
    $arr = array(1, 2, 3, 4, 5);
    array_pop($arr);
    print_r($arr);
?>

The output result is:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

In the above code, an array containing 5 elements is first defined. Then, the last element was removed using the array_pop function. Finally, print the values ​​of the array through the print_r function. As you can see, the last element in the array has been deleted.

Method 2: Use the unset function
In addition to using the array_pop function, we can also use the unset function to delete the last element in the array. The unset function can delete the specified element from the array. If we pass the last element of the array as parameter to the unset function, we can delete the last element of the array.

The sample code is as follows:

<?php
    $arr = array(1, 2, 3, 4, 5);
    unset($arr[count($arr) - 1]);
    print_r($arr);
?>

The output result is:

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

In the above code, we first calculate the subscript of the last element in the array, and then add the subscript The flag is passed as a parameter to the unset function. This will remove the last element in the array. Finally, use the print_r function to print the value of the array. You can see that the last element in the array has been deleted.

Summary
The above are two methods of deleting the last element in a PHP array. Although PHP does not have a special function to delete the last element in the array, we can use the array_pop function and unset function to achieve this function. When using it, we need to choose the most appropriate method according to the actual situation. The effect of both methods is the same, but the implementation is slightly different.

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