Finding large files on Linux

I had a client running out of disk space, and support gave me the command to find all the big stuff. This is to find files larger than 10MB. It prints a list ordered by smallest to largest.

sudo find / -mount -noleaf -type f -size +10000k -print0 | xargs -0 ls -lhSr | perl -ne ‘/(\S+\s+){4}(\S+)\s+(\S+\s+){3}(.*)/ and printf(“%*s %s\n”,7,$2.”:”,$4);’

One thing to note is that this didn’t include mailboxes… they must be stored somewhere else on this particular server. The culprit in this case turned out to be a mailbox that was 15GB (!!). 

Validating fields in Gravity Forms

Despite CAPTCHA, spammers have been submitting spam forms on a few of our client’s websites. The submissions usually have the same first and last name, and often contain a website address in the message. I was able to add a little code to the theme’s functions.php to prevent this type of thing.

add_filter( 'gform_validation_1', 'validate_contact_fields_1' );
function validate_contact_fields_1( $validation_result ) {
    $form = $validation_result['form'];
  
    // first and last name can't be the same
    if ( rgpost( 'input_1' ) == rgpost( 'input_2' ) ) {
  
        // set the form validation to false
        $validation_result['is_valid'] = false;
  
        //finding Field with ID of 1 and marking it as failed validation
        foreach( $form['fields'] as &$field ) {
  
            //NOTE: replace 1 with the field you would like to validate
            if ( $field->id == '1' ) {
                $field->failed_validation = true;
                $field->validation_message = 'First and Last Name can not be the same.';
                break;
            }
        }
  
    }
    // Message can't contain a URL
    $nourl_pattern = '(http|https)';
    if ( preg_match( $nourl_pattern, rgpost( 'input_4' ) ) ) {

		$validation_result['is_valid'] = false;
        foreach( $form['fields'] as &$field ) {
  
            if ( $field->id == '4' ) {
                $field->failed_validation = true;
                $field->validation_message = 'Message can not contain website addresses.';
                break;
            }
        }
    }
  
    //Assign modified $form object back to the validation result
    $validation_result['form'] = $form;
    return $validation_result;
  
}  // end function validate_contact_fields_1

Fixing anchor links that scroll too far down the page

For the second time, I needed to adjust the CSS for a site that is using anchor links. The problem was, the page would scroll down too far because of a fixed menu at the top of the page, and the anchor link area ended up underneath the menu.

The fix is to add this to the site’s CSS:

:target:before {
content:””;
display:block;
height:55px; /* fixed header height*/
margin:-55px 0 0; /* negative fixed header height */
}

Change the height and margin to match the height of the fixed menu. Sometimes the display setting needs a little tweaking, too. Woo!

Dejunking WordPress options

While investigating a slow WordPress installation, I came across this post on how to check if autoloaded options are a factor in the slowdown.

How To Remove Unwanted Autoloaded Data on a WordPress Website

I had no idea that plugins would leave so much junk behind! Here are the two queries to investigate. One to see how big the total options are, and the second to find the worst offenders.

SELECT SUM(LENGTH(option_value)) as autoload_size FROM wp_options WHERE autoload=’yes’;

SELECT LENGTH(option_value),option_name FROM wp_options WHERE autoload=’yes’ ORDER BY length(option_value) DESC LIMIT 15;

For the site I was working on, I set the unnecessary options to autoload=’no’ … just in case it would affect the site.

Adding stuff after the body tag in WordPress

Today I had to add some retargeting code to a site, and my research revealed that I needed to add it to the functions.php of the theme. No problem.


function jr_add_floodlight_retargeting() {
// Added 4/14/21 by EKB to put code on landing page for Floodlight campaign 
   if ( isset( $_GET['utm_source'] ) ) {
      if($_GET['utm_source'] == "ww") {
        ?>
         ... javascript code here ...
        <?php
      }
   }
} // end function jr_add_floodlight_retargeting
add_action( 'wp_body_open', 'jr_add_floodlight_retargeting' );

But then, my code wasn’t firing properly, and I discovered that the child theme was old enough that it didn’t have the necessary code in header.php. I found out from this article:

WordPress 5.2 action that every theme should use

Added that code to the theme’s header file, and away I went! Yay.