PHP | readfile( ) Function

The readfile() function in PHP is an inbuilt function which is used to read a file and write it to the output buffer. The filename is sent as a parameter to the readfile() function and it returns the number of bytes read on success, or FALSE and an error on failure.
By adding an ‘@’ in front of the function name the error output can be hidden.

Syntax:

readfile(filename, include_path, context)

Parameters Used:
The readfile() function in PHP accepts three parameters.



  1. filename : It is a mandatory parameter which specifies the file name.
  2. include_path : It is an optional parameter which can be set to 1 if you want to search for a file in the include_path in php
  3. context : It is an optional parameter which specifies the behavior of the stream.

Return Value:
It returns the number of bytes read on success, or FALSE and an error on failure.

Note: URL can be used as a filename with this function if the fopen wrappers have been enabled.

Errors And Exception

  • Turning off output buffering before calling Readfile() function may help in reading larger files into the memory.

Examples:

Input : echo readfile("gfg.txt");
Output : A computer portal for geeks!

Input : $myfile = @readfile("gfg.txt");
        if (!$myfile) 
        {
             print "File could not be opened";
        }
Output : A computer portal for geeks!

Below programs illustrate the readfile() function.

Suppose there is a file named “gfg.txt”

Program 1

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<?php 
  
// writing file contents on the output
//  buffer using readfile() function
echo readfile("gfg.txt");
  
?>

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Output: 


A computer portal for geeks!


Program 2













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<?php  


  


// writing file contents on the output 


//  buffer using readfile() function 


$myfile = @readfile("gfg.txt"); 


if (!$myfile)  


{ 


   print "File could not be opened"; 


} 


?> 



















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                        filter_none










Output: 


A computer portal for geeks!


Reference:

http://php.net/manual/en/function.readfile.php



          
          
          
          

            

    

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Shubrodeep Banerjee
I am a technology enthusiast who has a keen interest in programming I am pursuing Engineering in Computer Science from GEU, Dehradun I like to unwind by watching movies and English sitcomsI have a keen interest in music
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