Parse the fopen () function in php and use the description of open file mode

This article provides a detailed analysis of the fopen () function in php using the open file mode description. if you need a friend, refer to the fopen () function to open a file in PHP.
The first parameter of this function contains the name of the file to be opened, and the second parameter specifies the mode used to open the file:

The file may be opened in the following mode:
R: Read-only. The pointer is located at the beginning of the file. if the file is not reported.
R +: read/write. The pointer is located at the beginning of the file. if the file is not stored, an error is returned.
W: write only. Open and clear the file content. if the file does not exist, create a new file.
W +: read/write. Open and clear the file content. if the file does not exist, create a new file.
A: append. Open the file and locate the pointer at the end of the file. if the file does not exist, create a new file.
A +: Read/append. Open the file and locate the pointer at the end of the file. if the file does not exist, create a new file.
X: Write-only. Create a new file. If the object already exists, FALSE is returned.
X +: read/write. Create a new file. If the file already exists, FALSE and an error are returned.

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