File Operations in PHP (1) -- Open/read files,

File Operations in PHP (1) -- Open/read files,

1. Open a file (fopen)

 

Syntax: resource $ fp = fopen (file address, mode), returns a file pointer (file pointer)

Mode	Description
R	Read-Only
W	Write (clear and overwrite)
A	Append

$ Fp = fopen ('. /aa.txt ', "r"); // read-only $ fp = fopen ('. /aa.txt ', "w"); // write (clear overwrite) $ fp = fopen ('. /aa.txt ', "a"); // append

2. Read the file (Fread, file_get_contents)

Syntax: stringFread($ Fp, file size)

File_get_contents reads the entire file into a string

Syntax: stringFile_get_contents(String$ Filename)

<? Php $ filename = '. /aa.txt '; echo "<br> ****** first read method ******** <br> "; $ fp = fopen ($ filename, "r"); $ con = fread ($ fp, filesize ($ filename )); // by default, the content displayed on the webpage does not wrap. You need to replace the line break \ r \ n-> <br/> $ con = str_replace ("\ r \ n ", "<br/>", $ con); echo "$ con"; // close the pointer fclose ($ fp ); echo "<br> ****** the second method for reading data cyclically (applies to large files) ******** <br> "; $ fp = fopen ($ filename, "r"); // sets the buffer to read 1024 bytes at a time. $ buffer = 1024; // checks whether the file pointer is at the end of the file while (! Feof ($ fp) {// read $ con = fread ($ fp, $ buffer); // Replace the linefeed $ con = str_replace ("\ r \ n ", "<br/>", $ con); echo "$ con" ;}// close the pointer fclose ($ fp ); echo "<br> ******* third read method ********* <br>"; $ con = file_get_contents ($ filename ); // Replace the linefeed $ con = str_replace ("\ r \ n", "<br/>", $ con); echo "$ con ";

Result:

3. fgets (): Read a row and move the pointer down a row.

$filename = "aa.txt";$fp = fopen($filename, 'r');while (!feof($fp)) {echo fgets($fp)."<br/>";}

Result:

$ Filename = "aa.txt"; fseek ($ fp, 0); // move the file pointer to the beginning of the file while (! Feof ($ fp) {echo fgets ($ fp). "<br/> ";}

Result:

4. getc (): Get a character

 

$ Filename = "aa.txt"; $ fp = fopen ($ filename, 'R'); while (! Feof ($ fp) {// obtain a Chinese character, occupying 3 bytes echo fqetc ($ fp). "<br/> ";}