PHP file read-write instance program

How PHP reads files

The file_get_contents () function reads the entire file into a string.

Example

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<?php Echo file_get_contents ("test.txt"); ?>

Output:

This was a test file with test text.

After PHP has opened the file, you need to read the file, typically using the fgets () function.

The function can read one row at a time from the file, reading the data continuously, to a newline character that encounters the line, or to the full text's ending symbol EOF.

The fgets () function can only read one row of data, so if you need to read all the data for a file, use a loop statement to complete it. Like what:

Example:
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<?php $fp = fopen ("Test.txt", "R"); while (! feof ($FP)) { Echo fgets ($FP). "<br/>"; } Fclose ($FP); ?>

4.fgets (read one row from the file pointer)
Grammar:

Fgets (Filepointer)
Filepointer, the file pointer to read. If successful, reads a row from the file and returns a string, FALSE if it fails.
Example:

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<?php $fp = fopen ("Test.txt", "R"); if ($FP) { For ($i =1;! feof ($fp); $i + +) { echo "line". $i. ":". Fgets ($FP). " <br/> "; } } Else { echo "Open file failed"; } Fclose ($FP); ?>

Suppose the contents of the Test.txt are:

Hello World
Hello Cnblogs
Hello Heihaozi
Hello everyone
The results of the page output are:

Line 1:hello World
Line 2:hello Cnblogs
Line 3:hello Heihaozi
Line 4:hello Everyone

where the feof () function is used to detect the end of a file. The only argument for this function is the file pointer (that is, the $fp file).

Of course, in PHP you can also use the ReadFile () function to read the entire file at once. This function includes opening the file, reading the file and outputting it to the browser and

Closes the file. Like what:

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<?php $bruce =readfile ("http://www.111cn.net"); Echo $bruce; ?>

3,php How to close a file

You can close a file by using the function fclose ().

Second, how PHP writes data to the file

As with PHP reading files, PHP writes to files as well: Open files, write data, and close files. The method for opening and closing a file is described above.

What about writing data to a file in PHP?

Use the fwrite () function, such as fwrite (file path, write content):

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<?php $bruce =fopen ("http://www.111cn.net/", "R"); if (! $bruce) { Echo ' file does not exist '; Exit } while (!feof ($bruce)) { $rose =fgets ($bruce); $james =fopen ("index.htm", "a"); Fwrite ($james, $rose); Fclose ($james); } Fclose ($bruce); ?>

<a href= "index.htm" > generates local files for 111cn.net content </a>

 
understands PHP's read and write files, and saves the simplest data saved in the text