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 $posts = get_posts(array('posts_per_page' => 10,));

これだと１０だが、毎回は面倒(´・ω・) ｽ
get_postsの配列内、posts_per_pageの値を
get_option(‘posts_per_page’)　とすればおｋ

$posts = get_posts(array('posts_per_page' => get_option('posts_per_page')));

見やすく書くと

$args = array(
'posts_per_page'   => get_option('posts_per_page'),
);
 $posts_array = get_posts( $args );

<?php $args = array(
	'posts_per_page'   => 5,
	'offset'           => 0,
	'category'         => '',
	'category_name'    => '',
	'orderby'          => 'date',
	'order'            => 'DESC',
	'include'          => '',
	'exclude'          => '',
	'meta_key'         => '',
	'meta_value'       => '',
	'post_type'        => 'post',
	'post_mime_type'   => '',
	'post_parent'      => '',
	'author'	   => '',
	'post_status'      => 'publish',
	'suppress_filters' => true 
);
$posts_array = get_posts( $args ); ?>