How to pass variables to array in php

In PHP, array is one of the very important data structures. In actual programming, it is often necessary to pass variables to an array in order to operate the array elements. This article explains how to pass variables into PHP arrays.

For the convenience of explanation, we assume that there is an associative array $arr, which contains several key-value pairs, for example:

$arr = array("foo" => "bar", "hello" => "world");

Now we need to add an element to this array. We can write like this:

$arr["new_key"] = "new_value";

In this example, we add a new key-value pair "new_key" => "new_value" to the $arr array.

So if we have a variable $key and a variable $value, how to pass their values ​​to the array? We can use the following code:

$key = "new_key";
$value = "new_value";
$arr[$key] = $value;

In this example, we first assign the values ​​of the variables $key and $value to two new variables respectively. Then, we pass $key and $value respectively to the array $arr through the subscript symbol [].

It should be noted that if you want to pass a variable to the array instead of a specific value, you need to add the $ symbol in front of the variable name, such as $key and $value.

If we want to add multiple elements to the array at one time, we can use the array union operator, for example:

$arr = array("foo" => "bar", "hello" => "world");

$new_arr = array("new_key1" => "new_value1", "new_key2" => "new_value2");

$arr = $arr + $new_arr;

In this example, we first define an associative array $arr, and then A new associative array $new_arr is defined, which contains two key-value pairs. Finally, we use the operator to merge the elements in $new_arr into the $arr array.

It is important to note that if the same key name exists in the $arr array and the $new_arr array, the elements in $new_arr will overwrite the elements with the same name in $arr.

In summary, passing variables to PHP arrays is very simple. We just need to use the subscript symbol [] to pass the variable to the array. If you want to pass multiple variables at once, you can use the array union operator. In actual programming, we will often use these operations to add, delete, modify, check and other operations on arrays.

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