The fpassthru() function in PHP is an inbuilt function which is used to read data from a current position from a specified file until end of file and then write the result to the output buffer. The file which has to be read is sent as a parameter to the fpassthru() function and it returns the number of characters passed on success or FALSE on failure.
Syntax:
int fpassthru ( $file )
Parameters Used:
The fpassthru() function in PHP accepts one parameter.
- file: It is a mandatory parameter which specifies the file.
Return Value:
- It returns the number of characters passed on success or FALSE on failure.
Exceptions
- The file should be opened in binary mode while using the fpassthru() function on a binary file on Windows.
- rewind() function should be called to set the file pointer to the beginning of the file if you have already written to the file.
- the readfile() function should be used if you want to dump the contents of a file to the output buffer without modifying it.
Below is the implementation of fpassthru() function.
Suppose a file gfg.txt contains the following content :
Geeksforneveropen
Portal for Geeks!
Program 1:
<?php // opening a file in read only mode $myfile = fopen("gfg.txt", "rb");   // Reading the first line of the file fgets($myfile);   // Sending the rest of the file // contents to the output buffer echo fpassthru($myfile);   // closing the file fclose($myfile); ?> |
Output:
Portal for Geeks!17
Note: 17 indicates the number of characters passed.
Program 2:
<?php   // dumping index page of the server fpassthru($myfile); ?> |
Reference :
http://php.net/manual/en/function.fpassthru.php
