php fwrite append not working

Question

Hello I am trying to make a script that is based on HTML post and basic PHP.

I have 1 input on HTML, and I have this PHP code:

<?php echo'h'?>

One of my friends said that if I changed the w to an it would create a new line so I changed it and it is still not working.

Basically what I am trying to do is that when they enter the text box any word, it writes that word to the text document, but the second time it won't create a new line, I just want to create a new line.

Here is my full code:

<?PHP
    $file_handle = fopen("sample.txt", "r");
    $file_contents = $_POST['f1'];
    fwrite($file_handle, $file_contents);
    fclose($file_handle);
    print "file created and written to";
?>

Answer 1

There is also other seemingly simpler functions by the names: file_put_contents() and file_get_contents(), which could be used (in your case) to make things a little easier to handle. The Code below shows the use of file_put_contents() and it's kin: file_get_contents() to accomplish the task.

    <?php

        $fileName       = "sample.txt";

        // GET THE TEXT TYPED-IN BY THE USER...         
        // ONLY YOU KNOW THE WAY TO GET THIS VALUE BUT WE CAN ASSUME (FOR NOW)          
        // THAT IT IS COMING FROM THE POST VARIABLE AND HAS THE NAME: input
        $input          = isset($_POST['input']) ? $_POST['input'] : null;

        // FIRST TRY TO SEE IF THE FILE EXIST, OTHERWISE CREATE IT
        // HOWEVER; WITH JUST AN EMPTY CONTENT
        if(!file_exists($fileName)){
            file_put_contents($fileName, "");
        }           

        // DO THE SAVING ONLY IF WE HAVE ANY INPUT (STRING) TO SAVE
        if($input){
            // GET THE CURRENT CONTENTS OF THE FILE...
            $fileContent    = file_get_contents($fileName);

            // ADD THE INPUT TO THE CURRENT CONTENTS OF THE FILE (WITH A NEW LINE)
            $fileContent   .= "\n{$input}";

            // SAVE THE MODIFIED CONTENT BACK AGAIN...
            $bytesSaved     = file_put_contents($fileName, $fileContent);

            // IF THE FILE WAS SUCCESSFULLY WRITTEN... THEN...
            // DISPLAY A MESSAGE TO THAT EFFECT
            if($bytesSaved){
                print "file created and written";
            }

        }