How to change array name in php

In PHP, an array is a commonly used data structure that stores a set of related data in a variable. Sometimes, we need to change the name of an array to express the meaning of the variable more clearly. In this article, I will explain how to change array names in PHP.

1. Changing the array name through assignment statements

The assignment statement in PHP can be used to change the array name. For example, we have an array called $my_array:

$my_array = array('apple', 'banana', 'cherry');

If we want to change $my_array to $fruit, we simply assign the value of $my_array to $fruit:

$fruit = $my_array;

Now, we can use the $fruit array to access the elements in the original $my_array:

echo $fruit[0]; // 输出 'apple'
echo $fruit[1]; // 输出 'banana'
echo $fruit[2]; // 输出 'cherry'

Although this method is simple, it should be noted that it only points the $fruit variable to $my_array. values ​​instead of creating a new array. So if we change the elements in $my_array, $fruit will also be affected:

$my_array[0] = 'orange';
echo $fruit[0]; // 输出 'orange'，而不是 'apple'

2. Create a new array using PHP's array_combine() function

another One way to change the name of an array is to use PHP's array_combine() function to create a new array. This function combines two arrays, one as keys and the other as values.

For example, we have an array called $fruits, which contains the names of fruits, and an array called $prices, which contains the prices of each fruit:

$fruits = array('apple', 'banana', 'cherry');
$prices = array(0.5, 0.3, 0.8);

We can use array_combine( ) function merges them into a new associative array $fruit_prices, with the $fruits array as the key and the $prices array as the value:

$fruit_prices = array_combine($fruits, $prices);

Now, we can use the $fruit_prices array to access the price of each fruit:

echo $fruit_prices['apple']; // 输出 0.5
echo $fruit_prices['banana']; // 输出 0.3
echo $fruit_prices['cherry']; // 输出 0.8

The new array created using this method is brand new and has no relationship with the original array.

3. Use PHP's array_copy() function to create a copy of the array

The last method is to use PHP's array_copy() function to create a copy of the original array, which can be changed The name of the new array.

For example, we have an array named $my_array:

$my_array = array('apple', 'banana', 'cherry');

We can use the array_copy() function to create a copy array named $fruit:

$fruit = array_copy($my_array);

Now , we can use the $fruit array to access the elements in the original $my_array:

echo $fruit[0]; // 输出 'apple'
echo $fruit[1]; // 输出 'banana'
echo $fruit[2]; // 输出 'cherry'

Similar to the first method, the new array created using this method still points to the original array, so if you change $my_array elements, $fruit will also be affected.

Conclusion

This article introduces three ways to change the name of an array in PHP: changing the array name through an assignment statement, using PHP's array_combine() function to create a new array and using PHP The array_copy() function creates a copy of the array. Each method is suitable for different situations and requires attention to the conditions affecting the original array. Please use caution when using these methods and make sure you understand how they work and the limitations of their use.

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