WordPress at a glance
filter is not described

tiny_mce_before_init filter-hook . WP 1.0

This filter is documented in wp-includes/class-wp-editor.php

Usage

add_filter( 'tiny_mce_before_init', 'filter_function_name_3185', 10, 2 );
function filter_function_name_3185( $tinymce_settings, $string ){
	// filter...

	return $tinymce_settings;
}
$tinymce_settings
-
$string
-

Где вызывается хук

wp_tinymce_inline_scripts()
tiny_mce_before_init
_WP_Editors::editor_settings()
tiny_mce_before_init
wp-includes/script-loader.php 485
$tinymce_settings = apply_filters( 'tiny_mce_before_init', $tinymce_settings, 'classic-block' );
wp-includes/class-wp-editor.php 806
$mceInit = apply_filters( 'tiny_mce_before_init', $mceInit, $editor_id );

Где используется хук в ядре WordPress

wp-includes/default-filters.php 245
add_filter( 'tiny_mce_before_init', '_mce_set_direction' );