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PHP how to get the file name in the directory, I believe that many inexperienced people do not know what to do, so this article summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

Let's take a look at how to get the knowledge about the files in the directory in PHP.

In other words, if you want to know how to get the files in the directory, you must first open and close the directory, so the opendir () function and closedir () function can click on the link above to learn. Let's take a look at how to get the files in the directory in PHP.

We can get the file name in the directory through the readdir () function and the scandir () function in PHP.

The readdir () function gets the next file name in the file

The readdir () function is a simple operation, because when the function executes successfully, it can return a file or directory name in the directory opened by the opendir () function; if the function does not execute successfully, the result is flase.

The basic syntax format of the readdir () function is as follows:

Readdir ([resource $dir_handle])

Next, let's take a look at the use of the readdir () function through an example, as follows:

Output result:

In the above example, this method of writing is generally not used. Generally, if you want to get all the files in the directory through the readdir () function, you need to obtain them through the while loop. The example is as follows:

Output result:

The scandir () function, which returns the directory file name as an array

We learned that the readdir () function can get the file name in the target directory, and the file or directory name in the directory can be obtained simply and directly with the while loop. The scandir () function I'm going to talk about is a little different from the readdir () function.

The readdir () function can only return one file name at a time, but the scandir () function can return all file names and directory names in the target directory after successful execution.

The result returned by the readdir function if the execution is not successful is that the flase,scandir function returns flase if the execution is not successful, but there will also be an error message.

Let's take a look at the basic syntax of the scandir () function. The example is as follows:

Scandir (string $directory [, int $sorting_order [, resource $context]])

It should be noted that $directory represents the directory to be read; when the parameter of $sorting_order is set to SCANDIR_SORT_DESCENDING or 1, the result is the file name, which is sorted in descending alphabetical order.

Next, let's take a look at the application of the scandir () function through an example, as follows:

In the above example, the purpose is to get the file names in the directory with the directory path "D:\ phpstudy_pro\ WWW" through the scandir () function, and then use different parameters to achieve different alphabetical order. The output is as follows:

From the above example, you can see that the scandir () function can return the file names in the target directory in the form of an array, and the order of the returned results varies with the argument of $sorting_order in the function.

After reading the above, have you mastered how to get the file name in the directory in PHP? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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