How to read txt file in php and convert it into array

PHP is a very flexible programming language that can read and process a variety of different types of files. Using PHP is very convenient when we need to read a text file and convert it into an array.

In this article, we will discuss how to read a text file and convert it into an array using PHP. We will start from the following aspects:

• Open a text file

• Read the file content

• Convert the file content into an array

• Close the file

##1. Open the text file

In PHP, we use the fopen() function to open a text file. The first parameter of this function is the name of the file to be opened, and the second parameter is the operation to be performed. There are four operating modes, namely:

• 'r' - read-only mode, returns false if the file does not exist.

• 'r ' - read/write mode, returns false if the file does not exist.

• 'w' - Write-only mode, the contents of the file will be cleared before writing to it, and the file will be created if it does not exist.

• 'w ' - read/write mode, the contents of the file will be cleared before writing to the file, and the file will be created if it does not exist.

For the purposes of this article, we only need to use 'r' mode, since we just want to read the contents of the file. Well, the first thing we have to do is open a text file:

$file = fopen("example.txt", "r");

This will open a file called "example.txt" and set the file pointer at the beginning of the file.

2. Read the file content

Once we open the file, we need to read the file content. In PHP, we use the fgets() function to read the file content line by line. The first parameter of the fgets() function is the file pointer of the file we open, and the second parameter is how many characters to read. When we set the value of the second parameter to 0, it will read the entire line.

Here is an example of using the fgets() function to read a text file:

$file = fopen("example.txt", "r");
// 逐行读取文件内容
while(!feof($file)) {
 $line = fgets($file);
 echo $line;
}
fclose($file);

In this example, we use a while loop to read one line at a time until the end of the file. In the loop, we use the fgets() function to read the contents of each line and print it out.

3. Convert the file contents into an array

Now that we have learned how to open and read a text file, next we need to convert the file contents into an array. In PHP, we use the explode() function to split a string into array elements. We can use this function to split each line of text into array elements after reading it.

Here is an example of using the explode() function in a loop to convert the contents of a text file into an array:

$file = fopen("example.txt", "r");
// 将文件内容转化为数组
$array = array();
while(!feof($file)) {
 $line = fgets($file);
 $array[] = explode(",", $line);
}
fclose($file);

In this example, we use the explode() function to split each item at a comma row and add it to the array $array.

4. Close the file

After we write data to the file, the file must be closed so that other applications can access the file. Close the file using the fclose() function:

fclose($file);

In this example, we use the fclose() function to close the open text file.

Summary

In this article, we learned how to read a text file and convert it into an array using PHP. We start by opening a text file, then read the file contents and convert them into an array. Finally, we close the file.

This process is very simple in PHP, we only need to use a few basic functions to complete it. If you need to process text files in PHP, this article would be a good starting point.

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