apply_filters( ‘wp_should_output_buffer_template_for_enhancement’, bool $use_output_buffer )

Description

By default, an output buffer is only started if a ‘wp_template_enhancement_output_buffer’ filter has been added or if a plugin has added a ‘wp_finalized_template_enhancement_output_buffer’ action. For this default to apply, either of the hooks must be added by the time the template is included at the ‘wp_before_include_template’ action. This allows template responses to be streamed unless the there is code which depends on an output buffer being opened. This filter allows a site to opt in to adding such template enhancement filters later during the rendering of the template.