fopen

Tanax · 07-21-2008, 09:08 PM

Hey!

I'm having some trouble with a function:

PHP Code:


			
    /**

    * Function file_put_contents

    * Params $szFilename, $szInject

    *

    * Writes the text into the logfile. New text is always added in the beginning of logfile so that newest is always on top

    * Returns true or false

    **/

    function file_put_contents($szFilename, $szInject) {

        

        // Open the file

        $szContent = fopen($szFilename, 'w+');

        

        // Write the text into it

        $put = fwrite($szContent, $szInject);

        

        if($put) {

            

            // If success, return true

            return true;

            

        }

        

        // If failure, return false

        return false;



    }

Problem: Well it seems to overwrite the content of the file, so everytime the function is used, the file is replaced with a new content, and not ADDING the content.

I want the marker at the beginning of the file when opened so the newest text is written in the beginning. I also want it to CREATE the file if the file does not exist.

Thanks in advance!

delayedinsanity · 07-21-2008, 11:15 PM

Without looking into fopen flags, here's what I would do off the top of my head:

PHP Code:


			
function file_put_contents($szFilename, $szInject) {

    $szInput = file_get_contents($szFilename);
    
    $szOutput = fopen($szFilename, 'w+');

    $szInput = $szInject."\n".$szInput;

    $put = fwrite($szContent, $szInput);

    return ($put == TRUE) ? TRUE : FALSE;

}

Now after looking into fopen flags...

'w+' won't work, because as the manual says: Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.

Your function will probably work just the way it is if you change w+ to r+, like so:

PHP Code:


			
    function file_put_contents($szFilename, $szInject) { 
         
        // Open the file 
        $szContent = fopen($szFilename, 'r+'); 
         
        // Write the text into it 
        $put = fwrite($szContent, $szInject); 
         
        if($put) { 
             
            // If success, return true 
            return true; 
             
        } 
         
        // If failure, return false 
        return false; 

    }

-m

Tanax · 07-21-2008, 11:25 PM

The first one without flags will probably be the best shot, why didn't I think of that...?

The one with r+ won't work, because r+ does not attempt to create it if it doesn't exist.. =//

delayedinsanity · 07-22-2008, 01:00 AM

Right, I forgot that part.

You could always check file_exists first,

PHP Code:


			
if (file_exists($szFilename))
{
    fopen($szFilename, 'r+');
}
else
{
    fopen($szFilename, 'w+');
}

Kalle · 07-22-2008, 09:55 AM

Are you working with PHP4 since you use a function called file_put_contents() cause in PHP5 theres one called that (=

Tanax · 07-22-2008, 01:22 PM

I got it working:

PHP Code:


			
/**
    * Function file_intersperse_contents
    * Params $szFilename, $szInject
    *
    * Writes the text into the logfile. New text is always added in the beginning of logfile so that newest is always on top
    * Returns true or false
    **/
    function file_intersperse_contents($szFilename, $szInject) {
        
        // Check if file exist
        if(file_exists($szFilename)) {
            
            // If file exist
            // Get the content
            $szContent = file_get_contents($szFilename);
            // Add the new text in the beginning
            $szInject = $szInject . $szContent;
            // Open the file and delete all text in it
            $szFile = fopen($szFilename, 'w+');
            
        }
        
        else {
            
            // If file does not exist
            // Create file and open the file
            $szFile = fopen($szFilename, 'a+');
            
        }
        
        // Write the text into it
        $put = fwrite($szFile, $szInject);
        
        if($put) {
            
            // If success, return true
            return true;
            
        }
        
        // If failure, return false
        return false;
        
        // Close the file
        fclose($szFile);

    }