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POHow can I make this PHP code more efficient? (Editing a line in a CSV file)
 

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  1. POHow can I make this PHP code more efficient? (Editing a line in a CSV file)
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    <p>This code works, but I just hacked it together with my limited knowledge of PHP and I'm sure there's a more elegant and efficient way to go about it. If you'd be so kind as to point out how I can improve, that would be great!</p> <p>So I have a CSV file, structured like so:</p> <pre><code>Code Class Value Status Date Created Date Redeemed ======================================================================== a51f3g45 gold 50 valid 2012-08-20 4f6a2984 silver 200 redeemed 2012-08-23 2012-08-27 gf3eb54b gold 150 valid 2012-08-30 etc... </code></pre> <p>The user fills out a form to change the <strong>Class</strong>, <strong>Value</strong>, and <strong>Status</strong> fields of a given line. I cobbled together the following code to replace the old values with the new ones:</p> <pre><code>$file = 'codes.csv'; $old_csv_string = file_get_contents($file); preg_match('/('.$_POST['code'].',.*,.*,.*,.*,.*)\n/',$old_csv_string,$matches); $old_row = $matches[1]; preg_match('/'.$_POST['code'].',(.*,.*,.*),.*,.*\n/',$old_csv_string,$matches_part); $old_row_part = $matches_part[1]; $new_row_part = $_POST['class'].",".$_POST['value'].",".$_POST['status']; $new_row = str_replace($old_row_part,$new_row_part,$old_row); $new_csv_string = str_replace($old_row,$new_row,$old_csv_string); file_put_contents($file,$new_csv_string); </code></pre> <p>So can I do better than 10 lines of code? Any advice would be greatly appreciated :)</p> <p><em>Note: I tried using <code>fgetcsv</code>, but I couldn't figure out how to find the unique code within a 2D array, then replace its siblings.</em></p>
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    1. USSam Nabi
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    1. COHow big is the CSV file? Would it be an option to simply write the whole file again? That would save you those regexes...
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      1. POHow can I make this PHP code more efficient? (Editing a line in a CSV file)
      1. USLix
    2. COIs it a formatted file like that (without heading and ====, of course) or you formatted it? If it is not formatted then what delimits fields? A space, spaces, or a tab? For if it is a single character then you can split each line.
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      1. POHow can I make this PHP code more efficient? (Editing a line in a CSV file)
      1. USGrzegorz
    3. COI doubt it'll get longer than 100 lines. But the form only submits info for one of the lines - how do I do the find/replace without regex?
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      1. POHow can I make this PHP code more efficient? (Editing a line in a CSV file)
      1. USSam Nabi
 

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