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function wpb_mce_buttons_2($buttons) {
	array_unshift($buttons, 'styleselect');
	return $buttons;
}
add_filter('mce_buttons_2', 'wpb_mce_buttons_2');

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/*
* Callback function to filter the MCE settings
*/

function my_mce_before_init_insert_formats( $init_array ) {  

// Define the style_formats array

	$style_formats = array(  
		// Each array child is a format with it's own settings

raewrites

.content-block { 
    border:1px solid #eee; 
    padding:3px;
    background:#ccc;
    max-width:250px;
    float:right; 
    text-align:center;
}
.content-block:after { 
    clear:both;

raewrites

function my_theme_add_editor_styles() {
    add_editor_style( 'custom-editor-style.css' );
}
add_action( 'init', 'my_theme_add_editor_styles' );

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<?php
function my_function() {
 
 // contents of function go here
 
}
add_action( 'pre_get_posts', 'my_function');
?>

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<?php
function my_function() {

 if ( !is_admin() && $query_>is_main_query() ) {
 
 // contents of function go here
 
 }
 
}

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<?php
function my_function() {

 if ( is_home() && $query->is_main_query() ) {
 
 $query->set( 'post_type', array( 'post', 'custom_post_type') );
 return $query;
 
 }
 

raewrites

<?php
function my_function() {

 if ( is_category() && $query->is_main_query() ) {
 
 $query->set( 'post_type', 'custom_post_type' );
 return $query;
 
 }
 

raewrites

<?php
function my_function() {

 if ( is_category( 'category-slug' ) && $query->is_main_query() ) {
 
 $query->set( 'post_type', 'custom_post_type' );
 return $query;
 
 }
 

raewrites

<?php
function my_function() {

 if ( is_category() && $query->is_main_query() ) {
 
 $query->set( 'orderby', 'title');
 $query->set( 'order', 'ASC' );
 return $query;
 
 }