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Thread: [RESOLVED] Delete a line in a text file

  1. #1
    Join Date
    Jun 2012
    Posts
    82

    resolved [RESOLVED] Delete a line in a text file

    Hello forum readers,

    I want to delete a special line in a flat file but can't solve it.
    I searched the internet but didn't find a solution, always get the error $id is undefined.
    I hope someone can help me

    flat file -> $id|$name|$address|$city
    Code:
    00001|name 1|address 1|city 1
    00002|name 2|address 2|city 2
    00003|name 3|address 3|city 3
    00004|name 4|address 4|city 4
    00005|name 5|address 5|city 5
    00006|name 6|address 6|city 6
    00007|name 7|address 7|city 7
    00008|name 8|address 8|city 8
    00009|name 9|address 9|city 9
    This is my code to read the flat file. The delete code is missing
    Code:
    <?php
    $do = isset($_REQUEST['do']) ? trim($_REQUEST['do']) : "";
    $self = $_SERVER['PHP_SELF'];
    $data_file = "textfile.txt";
    
    switch ($do) 
    	{
        case "";
    
    		$file_handle = fopen($data_file, "rb");
    			while (!feof($file_handle) ) 
    			{
    				$lines = file($data_file); 
    				$line_of_text = fgets($file_handle);
    				$row = explode('|', $line_of_text);
    
    					$id = $row[0];
    					$name = $row[1];
    					$address = $row[2];
    					$city = $row[3];
    			
    					echo '<div style="width:400px;">
    						<form method="post" action="'.$self.'" enctype="multipart/form-data" >
    							<input type="hidden" name="do" value="delete_data">
    							
    							<input type="hidden" name="id" value="'.$id.'" />'.$name.'
    							<input type="submit" name="delete" value="Delete" />
    						</form>
    						</div>'; 
    									
    
    			}
    				fclose($file_handle);
            break;
    
    
    	case "delete_data";
    
    		//Here code to delete selected line
    	
    		break;
    	}
    ?>
    Eg. I want to delete line with id=00003 and line with id=00007. What is de code to do this with using $id ? (without just entering a number like 3 or 7 in the code)
    I hope somebody can help me write the case "delete_data" code.

    Thanks already for those who can help me

    Best regards
    Last edited by coderunner; 06-18-2012 at 01:23 PM.

  2. #2
    Join Date
    Aug 2004
    Location
    Ankh-Morpork
    Posts
    22,332
    I often find it useful to read the entire file into an array via the file() function, delete the desired array element, then implode() the array into a string and overwrite the file with that string via file_put_contents().
    "Well done....Consciousness to sarcasm in five seconds!" ~ Terry Pratchett, Night Watch

    How to Ask Questions the Smart Way (not affiliated with this site, but well worth reading)

    My Blog
    cwrBlog: simple, no-database PHP blogging framework

  3. #3
    Join Date
    Jun 2012
    Posts
    82
    Hello NogDog,

    Thanks for your reply.

    Is it possible to give me the code itself, I'm a beginner and that way I can learn of it and try to understand it.

    Thanks in advance

    Kind regards

  4. #4
    Join Date
    Aug 2004
    Location
    Ankh-Morpork
    Posts
    22,332
    The basics:
    PHP Code:
    $file '/path/to/some/file.txt';
    $lines file($file); // add some error-checking here to make sure it worked
    $filtered '';
    foreach(
    $lines as $line) {
       if(<
    you want to keep this line>) {
          
    $filtered .= $line;
       }
    }
    file_put_contents($file$filtered); 
    (You could replace that foreach() loop with a call to array_filter(), then implode() that result, but this way is probably easier to comprehend for now. )
    "Well done....Consciousness to sarcasm in five seconds!" ~ Terry Pratchett, Night Watch

    How to Ask Questions the Smart Way (not affiliated with this site, but well worth reading)

    My Blog
    cwrBlog: simple, no-database PHP blogging framework

  5. #5
    Join Date
    Jun 2012
    Posts
    82
    Hello again NogDog,

    Where do I have to put the $id (=first row of the line of flat file) of the form in this code so it only deletes the line when I click on the delete button?

    Sorry for all myquestions but as I said before I'm a totally beginner.

    Thanks for helping me.

    Best regards

  6. #6
    Join Date
    Jun 2012
    Posts
    82
    Anybody who can give me a working code for deleting a line that works for my code?
    That way I can examine the code and learn of it.
    Hope someone can help me here.

    Thanks in advance.

    Kind regards

  7. #7
    Join Date
    Jun 2012
    Posts
    82

    Solved

    Found it ... finally ...

    Thanks for your help NogDog

    Regards

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