Delete an image in PHP (WordPress) - php

Question

I have this code which uploads an image from admin and it works well.
add_action('admin_init', 'register_and_build_fields');
function register_and_build_fields() {
register_setting('theme_options', 'theme_options', 'validate_setting', 'delete_file');
}
function validate_setting($theme_options) {
$keys = array_keys($_FILES); $i = 0; foreach ( $_FILES as $image ) {
// if a files was upload
if ($image['size']) {
// if it is an image
if ( preg_match('/(jpg|jpeg|png|gif)$/', $image['type']) ) { $override = array('test_form' => false);
$options = get_option('theme_options'); echo "<img src='{$options['logo']}' />";
// save the file, and store an array, containing its location in $file
$file = wp_handle_upload( $image, $override ); $theme_options[$keys[$i]] = $file['url']; } else {
// Not an image.
$options = get_option('theme_options'); $theme_options[$keys[$i]] = $options[$logo];
// Die and let the user know that they made a mistake.
wp_die('No image was uploaded or invalid format.<br>Supported formats: jpg, jpeg, png, gif.<br> Go <button onclick="history.back()">Back</button> and try again.'); } } // Else, the user didn't upload a file.
// Retain the image that's already on file.
else { $options = get_option('theme_options'); $theme_options[$keys[$i]] = $options[$keys[$i]]; } $i++; }
return $theme_options;
}
and now I want the function to delete the current image.
function delete_file($theme_options) {
if (array_key_exists('delete_file', $_FILES)) {
$image = $_FILES['delete_file'];
if (file_exists($image)) {
unlink($image);
echo 'File '.$image.' has been deleted';
} else {
echo 'Could not delete '.$image.', file does not exist';
}
}
}
I added the button in admin but is doing.. nothing.
I'm building a TemplateOptions in WordPress and now I'm trying to make the logo function to be uploaded and deleted from admin. Like I said, uploading the logo works and now I want to make the field "delete" to work.

Answer 1

I found out that you don't need to insert the record in the DB as you only have a single image and whose name and path are also constant . So you simply need to unlink the image from the directory and it will be deleted, nothing else.
say your logo.png is in your themes's img folder then you should unlink it like this. default is your theme name
$path = ABSPATH.'wp-content/themes/default/img/logo.png';
if(file_exists($path))
{
unlink( $path );
}
Note: Remember that you have to pass the absolute path to the unlink() and not the url having http , because it will give you an error , you can't use http with unlink.