Fread and fgetc in PHP get the contents of the file in bytes or characters, why fgetc can't read the characters?

Hello everyone, there is a question about PHP processing files, ask you.

I wrote a piece of code to experience Fread () and fgetc (), and the contents of the file Test.txt are this is a test file. TXT file encoded as Utf-8 format

The above code can get the first character T, if the second parameter of Fread is less than 4 then nothing is read!

So the following fgetc () is also blank content.

Do not get the content

My computer is a Windows system

How do you understand the second argument of Fread () and a character in fgetc?

Is the reason for the file encoding format?

How should PHP handle file encoding format?

Thank you!

Reply content:

Hello everyone, there is a question about PHP processing files, ask you.

I wrote a piece of code to experience Fread () and fgetc (), and the contents of the file Test.txt are this is a test file. TXT file encoded as Utf-8 format

The above code can get the first character T, if the second parameter of Fread is less than 4 then nothing is read!

So the following fgetc () is also blank content.

Do not get the content

My computer is a Windows system

How do you understand the second argument of Fread () and a character in fgetc?

Is the reason for the file encoding format?

How should PHP handle file encoding format?

Thank you!

I have tried both ways, and I have no problem with the test. I use the Mac. Therefore, the initial judgment should be the system file encoding relationship.
In addition, there are warnings in the official documents of Fread:
Warning:在区分二进制文件和文本文件的系统上（如 Windows）打开文件时，fopen() 函数的 mode 参数要加上 'b'。

At the same time, Fgetc's official document has such a hint:
Note: 此函数可安全用于二进制对象。

Workaround, there is a hint in the document.

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