How to convert file content into array in php

Storing PHP files as arrays is a very common and practical method in PHP programming. In PHP, there are many ways to convert file contents into arrays. Below we will introduce several common methods in detail.

1. file() function

The file() function reads the entire file into an array. By using this function, we can store a text file as a PHP array. The syntax format of the file() function is as follows:

array file ( string $filename [, int $flags = 0 [, resource $context ]] )

The first parameter of this function is a string containing the file name to be read. The second parameter is optional and indicates how to handle the delimiter and Newline character, the third parameter is also optional and context options can be specified.

For example, suppose we have a file data.txt, which contains the following content:

John Doe, 25
Jane Smith, 32
Bob Johnson, 18

If we use the file() function to store the file content as an array, the code is as follows:

$file_array = file('data.txt');
print_r($file_array);

The output results are as follows:

Array
(
    [0] => John Doe, 25
    [1] => Jane Smith, 32
    [2] => Bob Johnson, 18
)

As you can see, the file content is stored as an array, and each line of content is an element of the array.

2. fread() function

The fread() function is used to read a specified number of bytes from a file. We can use this function to read text one line at a time and store it as array elements. The syntax format of the fread() function is as follows:

string fread ( resource $handle , int $length )

The first parameter of this function is the handle of the open file, and the second parameter indicates the number of bytes to be read.

For example, suppose we have a file data.txt, which contains the following content:

John Doe, 25
Jane Smith, 32
Bob Johnson, 18

If we use the fread() function to store the file content as an array, the code is as follows:

$handle = fopen('data.txt', 'r');
while (!feof($handle)) {
    $line = fgets($handle);
    $file_array[] = $line;
}
fclose($handle);
print_r($file_array);

The output results are as follows:

Array
(
    [0] => John Doe, 25
    [1] => Jane Smith, 32
    [2] => Bob Johnson, 18
    [3] =>
)

As you can see, the file content is stored as an array, and each array element is a line of text in the file.

3. file_get_contents() function

The file_get_contents() function is used to read the entire file content and return a string. We can store the file contents as a PHP array by using this function and splitting and processing the results according to our own needs. The syntax format of the file_get_contents() function is as follows:

string file_get_contents ( string $filename [, bool $use_include_path = FALSE [, resource $context [, int $offset = 0 [, int $length ]]]] )

The first parameter of this function is a string containing the file name to be read. The second parameter is optional and indicates whether to search in include_path. This file, the third parameter is also optional and can specify context options. The fourth and fifth parameters represent the offset and the number of characters to read.

For example, suppose we have a file data.txt, which contains the following content:

John Doe, 25
Jane Smith, 32
Bob Johnson, 18

If we use the file_get_contents() function to store the file content as an array, the code is as follows:

$file_contents = file_get_contents('data.txt');
$file_array = explode("\n", $file_contents);
print_r($file_array);

The output results are as follows:

Array
(
    [0] => John Doe, 25
    [1] => Jane Smith, 32
    [2] => Bob Johnson, 18
    [3] =>
)

As you can see, the file content is stored as an array, and each array element is a line of text in the file.

Summary

The above are three methods of storing PHP files as arrays. The file() function reads the entire file into an array, and the fread() function reads line by line. The file content is stored as an array. The file_get_contents() function reads the entire file content into a string, and then splits and processes it according to your own needs. Depending on the specific needs and scenarios, we can choose different methods to implement the function of converting file content into an array.

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