Instructions for using the php file_get_contents() function and file_put_contents() function

file_get_contents — Read the entire file into a string

file_get_contents() Read the entire file into a string. This function is the preferred method for reading the contents of a file into a string. If supported by the server operating system, memory mapping technology is also used to enhance performance.

Similar functions: fopen() function opens a file or URL. The difference is that after fopen() opens the web page, it does not return a string and cannot be output directly. You also need to use the fgets() function to obtain the string. The fgets() function reads a line from the file pointer. The file pointer must be valid and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).

Syntax

file_get_contents(path,include_path,context,start,max_length)

The file_put_contents() function writes a string to a file.

When this function accesses a file, it follows the following rules:

• If FILE_USE_INCLUDE_PATH is set, the built-in path for the copy of *filename* will be checked

• If the file does not exist, a file will be created

• Open the file

• If LOCK_EX is set, then Locking the file

• If FILE_APPEND is set, it will be moved to the end of the file. Otherwise, the contents of the file will be cleared

• Write data to the file

• Close the file and unlock all files

If successful, this function returns the number of characters written to the file. On failure, False is returned.

 file_put_contents(file,data,mode,context)

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