How to query file encoding format in php

In PHP development, we often encounter the need to query the file encoding format. At this time, we can use PHP's built-in functions to achieve this.

Next, we will introduce in detail how to query the file encoding format in PHP.

1. fopen function

Sample code:

$file = fopen('filename.txt', 'r');
$firstLine = fgets($file);
fclose($file);

echo mb_detect_encoding($firstLine);

Analysis:

We can open the file through the fopen function and use the fgets function Read the first line of data from the file. Then, use the mb_detect_encoding function to detect the encoding format of the first line of data, and finally output the resulting encoding format.

2. file_get_contents function

Sample code:

$content = file_get_contents('filename.txt');
echo mb_detect_encoding($content);

Analysis:

Use the file_get_contents function to read the contents of the entire file, and Store the read content in the $content variable. Then, use the mb_detect_encoding function to detect the encoding format of the $content variable, and finally output the resulting encoding format.

3. PHP built-in function mime_content_type

Sample code:

echo mime_content_type('filename.txt');

Analysis:

PHP built-in function mime_content_type can be based on the file extension to determine the file type. After passing a file name to the mime_content_type function, the function returns the MIME type of the file.

This method is only suitable for detecting some common types of encoding formats, but cannot detect all encoding formats.

To sum up, the above is the method of querying the file encoding format in PHP. Based on actual needs, you can choose one of the methods to implement the query.

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