Wordpress pagination not visible from loop - php

Question

I'm doing a blog with Wordpress and the post pagination doesn't appear. The post list is shown correctly, but there is only 5 post (I have 8) and pagination isn't working.
<?php
if (have_posts()): while (have_posts()) : the_post(); ?>
<div class="all-post">
<?php
$args = array('category' => '');
$myposts = get_posts($args);
foreach ($myposts as $post) : setup_postdata($post); ?>
<div class="post">
<div class="post-thumbnail">
<?php the_post_thumbnail(); ?>
</div>
<div class="post-details">
<div class="post-meta">
<span class="date"><?php the_time('j M, Y'); ?></span>
<!-- Categories -->
<span class="categories">
<?php
$category_ids = get_all_category_ids();
?><?php
$args = array('orderby' => 'slug', 'parent' => 0);
$categories = get_categories($args);
foreach ($categories as $category)
{
echo '<a href="' . get_category_link(
$category->term_id
) . '" rel="bookmark" class="category">' . $category->name . '' . $category->description . '</a>';
} ?>
</span>
</div>
<h2 class="post-title">
<?php the_title(); ?>
</h2>
Read More
</div>
</div>
<?php endforeach;
wp_reset_postdata(); ?>
</div>
<?php endwhile; ?>
<?php next_posts_link('Older posts'); ?>
<?php previous_posts_link('Newer posts'); ?>
<?php else: ?>
<?php endif; ?>

Answer 1

You maybe didn't set any posts_per_page value and the default is 5. If you want to modifiy it for the whole website blog/archive pages, modify the posts_per_page value in the Reading Settings page.
In a $args array, modify as folow:
$args = array(
'posts_per_page'=> -1, // unlimited
'category' => ''
);
$posts = get_posts($args);
I'm prudent with my answer (that why I give 2 methods to achieve this), because I don't know with your given code, if the main loop $args is modify.
I hope this could nevertheless help you.