Troubleshooting custom WordPress WP-CLI commands running on WP Engine’s SSH Gateway

This is a one line fix if you have missing string/array output from a custom WP-CLI command when using the WP Engine “SSH Gateway”.


    • WP Engine is a WordPress hosting company*.
    • They have an SSH Gateway – where you login to a separate machine and it will pass a limited range of useful commands to your actual server (basic file management, a MySQL console client, WP-CLI)
    • WP-CLI is a timesaving WordPress command line utility.

The problem is the unorthodox way the gateway works suppresses ordinary output from certain commands – e.g. print_r or echo.  Symptom: you run a  WP-CLI command of your own through the SSH gateway and lines of text you’re expecting are missing.

First, you should switch from WP_CLI::line() (deprecated now anyway) to WP_CLI::log() – the line() method doesn’t work because, if you dig into the source code, you’ll see it just echos the output, however log() uses the proper wp-cli Logger class.

That’s fine if you want to output strings. Unfortunately, it doesn’t work if you need to print an array.

This does though:

fwrite( STDOUT, print_r($foo, TRUE) );

To unpack that, we’re using print_r to neatly print the array. The second argument for print_r returns its value as a string.   You need not fopen STDOUT first, as you would for another file handle.

And that’s it.

* Would I recommend WP Engine? No, given I have hosting knowledge myself, and when I asked for their assistance with this particular problem, their support agent told me it was out of scope and I should look at StackOverflow, for which they have earned this mildly passive aggressive paragraph in a blog post that will sink without trace.   However, many people do like them, and if you’re a WordPress developer, you may well inherit a client with a site hosted there one day.

WordPress PSA: disable “Glue for Yoast SEO & AMP” plugin

If you have a site using the AMP plugin in “Reader” (formerly “Classic”) mode – which is to say it uses some simple templates for rendering AMP pages – you should remove Glue for Yoast SEO & AMP:

– it is no longer necessary
– the code in glue-for-yoast-seo-amp/classes/frontend.php adds a duplicate inline CSS selector for



.amp-site-title a

. This means the default colour scheme will override colours you set in Appearance > AMP.

Disabling the plugin fixes this.

(Tested with AMP 1.5.5, WordPress 5.4.2)