Log all gettext strings on a page in wordpress

log-gettext.php

<?php

function log_gettext_string( $text ) {
	global $mylist;
	
	if ( !isset($mylist) ) {
		$mylist = array();
		register_shutdown_function(function($a = null) { global $mylist; echo implode('<br>', $mylist); exit; } );
	}
	
	$mylist[$text] = $text;
}

// __( "hello world" )
function show_all_gettext_strings( $translated_text, $text, $domain ) {	
	log_gettext_string( $text );
	return $translated_text;
}
add_filter( 'gettext', 'show_all_gettext_strings', 10, 4 );

// _n( "hello %d world", "hello %d worlds", $number_of_worlds )
function show_all_gettext_strings__n( $translation, $single, $plural, $number, $domain ) {
	log_gettext_string( $single );
	log_gettext_string( $plural );
	return $translation;
}
add_filter( 'ngettext', 'show_all_gettext_strings__n', 10, 5 );

Output would look like:

PHP Errors in Ajax Response
PHP Fatal Error
Do not track any visits from this device.
%1$s, Author at %2$s
You searched for %s
Page not found
The post %1$s appeared first on %2$s.
Error 404: Page not found
Archives for
Home
You searched for
Dash
En dash
Em dash
Colon
Middle dot
Bullet
Asterisk
Low asterisk
Vertical bar
Small tilde
Left angle quotation mark
Right angle quotation mark
Less than sign
Greater than sign
html_lang_attribute
%1$s %2$s %3$s Comments Feed
%1$s %2$s %3$s Category Feed
%1$s %2$s %3$s Tag Feed
%1$s %2$s %3$s %4$s Feed
%1$s %2$s Posts by %3$s Feed
%1$s %2$s Search Results for “%3$s� Feed
%1$s %2$s %3$s Feed
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