PHP : write binary string to file

Question

I had encoded image to binary ($binaryImage) in a string. Now I want to save it in file in server.Here is the code, but I got the result: fwrite() expects parameter 1 to be resource, boolean given... . Is the code wrong?

            $binary=base64_decode($binaryImage);
            header('Content-Type: bitmap; charset=utf-8');

            $file = fopen('../uploadedImages/'.$filename, 'wb');
            // Create File
            fwrite($file, $binary);
            fclose($file);

(EDIT) I also tried :

            if($file===false){
                echo "Failed to file";
            }            
            // Create File
            if(fwrite($file, $binary)===false){
                echo "Failed to write";
            }

get this message:

fopen(../uploadedImages/FB_IMG_1437004428570.jpg): failed to open stream: No such file or directory in <b>/home/u505221043/public_html/welcom/include/db_functions.php

My php code is in "include" directory. And "uploadedImage" is 777 mode.

->include
   ->function.php
->uploadedImages

This has nothing to do with writing the string. The issue simply is that your fopen() fails and returns false instead of a resource handler. Since you do not do any error checking or handling at all in your code you try to use a file handler with value false which won't work and leads to the error message. As always: read the documentation of the functions you use if you encounter issues! — arkascha
– arkascha, Commented Jul 17, 2015 at 13:19
call getcwd to check whether you are really in the include folder — Answers_Seeker
– Answers_Seeker, Commented Jul 17, 2015 at 14:26

Jason McCreary · Accepted Answer · 2015-07-17 13:23:27Z

1

file() returns a boolean when it fails to open a file.

This could be for several reasons such as an incorrect path or permissions.

I recommend adding a guard clause, at least to debug this issues:

$file = fopen('../uploadedImages/' . $filename, 'wb');
if ($file === false) {
    exit("Failed to file");
}

edited Jul 17, 2015 at 13:23

answered Jul 17, 2015 at 13:20

Jason McCreary

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3 Comments

Answers_Seeker Over a year ago

He has to check for permissions also : 'ls -la' in the image's directory and 'chown -R www-data .' if php doesn't have the execution and reading permission

arkascha Over a year ago

@Answers_Seeker and this is true for all the folders in the path: the http servers process requires permission to enter those. Oh, and the use is not necessarily www-data. Also changing the owner is not the only option for this. Often it is much more elegant to change group writing access.

Answers_Seeker Over a year ago

@akascha: It adds the owner it doesn't change it. You are right about www-data but it's the standard

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