Common PHP file operation functions and simple instance analysis,

Common PHP file operation functions and simple instance analysis,

The most common file operations in PHP are reading and writing. Today, we will mainly explain how to read and write functions, and create a page access count function to record the access volume of a page.

Fopen ():PHP does not contain file creation functions. fopen () is used to create and open files. The function format is resource fopen (string filename, string mode)

The filename parameter is the name of the file to be opened or created and opened. The mode parameter is the mode to open. The specific mode is as follows:

Fread ():PHP can be used to read files. The function format is string fread (resource handle, int length)

Fread () reads a maximum of length bytes from the handle of the file pointer. It stops reading files in the following situations:

When length is read

Reached the end of the file (EOF)

(For Network streams) when a package is available or (after the user space stream is opened) It has read 8192 bytes

Fgets ():PHP is used to read a row of data from the file and direct the file pointer to the next row. The function is in the form of string fgets (resource handle, int length)

Fgets () reads a row from the pointer handle and returns a string of up to (length-1) bytes. It stops reading files in the following situations:

Line Break

Reached the end of the file (EOF)

Read (length-1) bytes

If length is not specified, the default value is 1024 bytes.

Fwrite ():PHP is used to write a string to a file. The number of written characters is returned when the file is successful. If the file fails, false is returned. The function form is int fwrite (resource handle, string data, int length)

Fwrite () writes the content of string data to the file pointer handle. The parameters are as follows:

If the length parameter is specified, the write will stop after the length bytes are written or the data string is written.

Let's take a look at an example: calculate the volume of content on the index.php page and write it into the count.html file. to count the page access volume, we will not bother with the database >_<. The Code is as follows:

Put this code in index.php. Every time you upload index.php, count.html will add 1. Then, through count.html, we can know the total access volume of index. php.

This section describes common PHP file operation functions.

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