Redirect all url with a query string in php

<IfModule mod_rewrite.c>

    RewriteEngine On
    RewriteCond %{QUERY_STRING} !(^|&)testing=true(&|$) [NC]

    RewriteRule ^ %{REQUEST_URI}?testing=true [L,QSA,R]

    RewriteCond %{REQUEST_FILENAME} !-f

    RewriteCond %{REQUEST_FILENAME} !-d

    RewriteCond $1 !^(index\.php|public|images|robots\.txt|css)

    RewriteRule ^(.*)$ index.php/$1 [L]

</IfModule>