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This article focuses on "how to fill arrays in PHP in different ways". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to fill arrays in PHP in different ways.

Array_fill function-key value fill array

In PHP, you can use the array_fill function to populate an array with key values. The basic syntax format of the array_fill function is as follows:

Array_fill (index,number,value)

It is important to note that all three parameters are required, the parameter index represents the first index in the returned array, the parameter number represents the number of elements to be inserted, and the parameter value represents the value to be populated.

If the parameter index is positive, the index in the returned array starts with the parameter index; if the parameter index is negative, only the index of the first element in the returned array is the parameter index, the second is 0, the third is 1, and so on.

The returned array has a total of parameter number elements, and the filled value is value. If the parameter number is 0 or less than 0, the function will make an error. The function runs successfully and the result returned is the populated array.

Let's take a look at the application of the array_fill function through an example, as follows:

Output result:

Let's take a look at what happens when the parameter index is negative. An example is as follows:

Output result:

In the above example, it shows the change in the output result of the parameter index parameter, that is, the change of the index.

Array_fill_keys function-key and value fill array

In PHP, we can use the array_fill_keys function to populate the array with keys and values. The basic syntax format of the array_fill_keys function is as follows:

Array_fill_keys (keys,value)

It should be noted that both parameters are required. The parameter keys represents the key that uses the array value of the parameter as the new array. If the value in the parameter keys is not standardized, it will be converted into a string, and the parameter value represents the value used to fill the array. The result returned is a populated array.

Let's take a look at the application of the array_fill_keys function through an example, as follows:

Output result:

In the above example, the parameter value has only one value, so the filled array is all filled with one value. When there is more than one parameter value, the example is as follows:

Output result:

In the above example, when the parameter value is also an array, the output becomes a multi-dimensional array.

At this point, I believe you have a deeper understanding of "how to fill arrays in PHP in different ways". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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