Question 232429 in PHP Question posted in
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Php include txt with second txt as a backup

I didn’t found a solution for my project on stack.

I’m using a php include txt file and i need a backup solution in my code.

For example:
My code is using Description.txt and if a client deletes this file i need to use the second file Description2.txt as a backup.

Something like this:

<php

? include Description.txt ! Description2.txt

# If file Description.txt no long exist, use Description2.txt as a backup.

?>

Thank you in advanced!

Tags:

2

Answers


  1. 0

    Attempting to include a file that doesn’t exists will emit an E_WARNING. You can avoid that by using file_exists()

    If (file_exists('description.txt'))
    include 'description.txt'
else
    include 'otherdescription.txt'
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  2. 0 
    1 === (@include 'Description.txt') || (include 'Description2.txt');

    From the PHP manual (https://php.net/include):

    Handling Returns: include returns FALSE on failure and raises a warning. Successful includes, unless overridden by the included file, return 1.

    Some details as the expression may appear shy:

    • The include is not a function, but a language construct. As the example above forms a complex expression, it is within parenthesis.

    • Using || this way is a left-hand shorthand, PHP won’t execute the right-hand side if the left-hand side is true

    Written as an if clause:

    if (1 !== (@include 'Description.txt')) {
    include 'Description2.txt';
}

    • If your customer not only deletes but also puts PHP code inside the file, anything is possible.

    • The @ error suppression operator will likely hide such circumstances, I only treat this kind of code as it is.

    Likely better for a .txt case (the same semantics otherwise apply):

    <pre><?= htmlspecialchars(
        @file_get_contents('Description.txt')
            ?: file_get_contents('Description2.txt')
) ?></pre>

    See https://php.net/file_get_contents (and the return value again) as well as for ?: the ternary operator ("It is possible to leave out the middle part of the ternary operator") that is able to do shorthand and return the value (here file contents).

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