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PHP fpassthru( ) Function

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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.
  • 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 :
Geeksforgeeks Portal for Geeks!
Program 1:
// opening a file in read only mode
$myfile = fopen("gfg.txt", "rb");
// Reading the first line of the file
// Sending the rest of the file 
// contents to the output buffer
echo fpassthru($myfile);
// closing the file

Portal for Geeks!17
Note: 17 indicates the number of characters passed. Program 2:
$myfile = fopen("", "rb");
// dumping index page of the server

Reference :

Last Updated : 31 Mar, 2023
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