example of conversion

heredoc_var

location \/ {
    try_files $uri $uri/ /index.php$is_args$args;
}

# pass the PHP scripts to FastCGI server listening on /var/run/php5-fpm.sock
    location ~ \.php$ {
      try_files $uri \/index.php =404;
      fastcgi_pass unix:/srv/web/etc/run/php5-fpm.sock;
      fastcgi_index index.php;
      fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
      include fastcgi_params;  
}

to_string

'location \\\/ {\n    try_files $uri $uri\/ \/index.php$is_args$args;\n  }\n\n  # pass the PHP scripts to FastCGI server listening on \/var\/run\/php5-fpm.sock\n  location ~ \\.php$ {\n    try_files $uri \/index.php =404;\n    fastcgi_pass unix:\/srv\/web\/etc\/run\/php5-fpm.sock;\n    fastcgi_index index.php;\n    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;\n    include fastcgi_params;\n  }'