PHP Learning Notes-Advanced tutorials-reading files, creating files, writing Files

Open file: Fopen:fopen (Filename,mode);//fopen ("Test.txt", "R"); Open mode: R read-only open, point file pointer to file header r+ read-write mode open, point file pointer to file header W Write, point to file header, If it does not exist, try to create a w+ read-write, point to the file header, and if it does not exist, try to create a write-through, point to the end of the file, and if not, try to create a + read-write open, point to the end of the file, and try to create
ReadFile (filename): reads the contents of the file and writes it to the output buffer

fopen (Filename,mode): Open file, create file

Fopen is also used to create files, if a nonexistent file is opened, this function creates the file, the Jiading file is opened for writing (W), or an increase (a).

Mode	Description
R	Open the file as read-only. The file pointer begins at the beginning of the file.
W	Open the file as write-only. Delete the contents of the file or create a new file if it does not exist. The file pointer begins at the beginning of the file.
A	Open the file as write-only. Existing data in the file will be preserved. The file pointer starts at the end of the file. Create a new file if the file does not exist.
X	Create a new file as write-only. Returns false and error if the file already exists.
r+	Opens the file as read/write, and the file pointer begins at the beginning of the file.
w+	Open the file for read/write. Delete the contents of the file or create a new file if it does not exist. The file pointer begins at the beginning of the file.
A +	Open the file for read/write. The data already in the file will be preserved. The file pointer starts at the end of the file. Creates a new file if it does not exist.
x+	Create a new file for read/write. Returns false and error if the file already exists.

Fwrite (resources, content)//write file contents

Fread (): The function reads the open file.

Fread ($myfile, FileSize ("Webdictionary.txt"));

Fget (resource, length)//Get the contents of the file, if the length is 10, you can get 9-bit fgets (): Used to read a single line, fgets (file,lenght), lenght optional, specify the number of bytes to read. The default is 1024 bytes.

Reads a row from the file pointed to by files and returns a string of up to length 1 bytes. Stops when a line break (included in the return value), EOF, or length -1 bytes has been read (see the first case). If lengthis not specified, the default is 1 K, or 1024 bytes.

Returns False if the failure occurs.

FGETC (): Reading a single character
Fclose (resources)//Close an open file resource unlink (file)//delete a file
Feof (): Check to see if the end has been reached. Useful for traversing data of unknown length.

 
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Fclose ($myfile);
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FileSize (filename): filename is the filename, is the string type. The results of this function are cached, and the trial Clearstatcache () is cleared to clear the cache. FileType ();