How to set array to spaces in php

In PHP, array is a very commonly used data type, which allows us to store multiple values ​​in a variable. Normally, when we create a new array, we assign an initial value to the array. But sometimes we need to set an array to spaces, so how to achieve it?

Below we will explain how to set a PHP array to spaces from the following three aspects:

1. unset function

PHP provides an unset function , you can delete the specified element in an array. If you use the unset function to delete the entire array, it will no longer do anything. Therefore, we can use the unset function to delete all elements in the array, thereby setting the array to spaces.

The following is a sample code to delete all elements in an array:

$array = array(1, 2, 3, 4, 5);
foreach($array as $key => $value){
    unset($array[$key]);
}
print_r($array);

Output:

Array()

It can be seen from the output that all elements in the array have been If deleted, the array becomes an empty array.

2. array_splice function

array_splice function is a very useful function in PHP, which can remove an element from an array and return the removed element. This function is very useful if we use a loop to remove all elements.

The following is a sample code that removes all elements in an array through a loop:

$array = array(1, 2, 3, 4, 5);
while(count($array) > 0){
    array_splice($array, 0, 1);
}
print_r($array);

Output:

Array()

This code uses a while loop to remove all elements in the array elements until the array is empty. As can be seen from the output, the array has been set to an empty array.

3. Overwrite variables as empty arrays

In addition to using the unset function and array_splice function to clear the array, we can also assign an array variable to an empty array. To do this, we need to simply assign the array variable to an empty array.

The following is a sample code to set an array variable to an empty array:

$array = array(1, 2, 3, 4, 5);
$array = array();
print_r($array);

Output:

Array()

This code assigns the $array variable to an empty array, The purpose of setting the original array to an empty array is achieved.

Summary

In PHP, setting an array to an empty array can be achieved through the unset function, the array_splice function, and assigning an array variable to an empty array. We can choose the corresponding method according to the specific situation and needs to realize the operation of the array being an empty array.

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