Previous and Next Post title from same category

Sometimes you may want to show the previous and next post title from same category just below your post. Here I am sharing you the code which i got from internet and used for someone which worked great. Here I am sharing you the corresponding css and php code.

CSS Code ( This code may need to tweak based on your theme)

div#opagination a[rel="prev"] {
    float: left;
    width: 50%;
}
div#opagination span {
    margin-left: 12px;
    margin-right: 12px;
}
div#opagination center {
    display: inline;
    
}
span.nextpost.txt {
    float: right;
}
span.prevpost.txt {
    float: left;
}
div#opagination a[rel="next"] {
    float: right;
	width: 50%;
	display:block;
}
div#opagination * {
    font-size: 15px;
}

div#opagination a span:last-child,div#opagination a span:last-child * {
    /* background: red; */
    display: block;
    font-size: 23px;
    font-weight: bold;
	text-align:center;
	clear: both;
}
div#opagination a span:first-child,div#opagination a span:first-child * {
    font-weight: bold;
    color: #ab9797 !important;
}

PHP code (That will go in your single.php file)

<?php
$post_id = $post->ID; // current post ID
$cat = get_the_category(); 
$current_cat_id = $cat[0]->cat_ID; // current category ID 

$args = array( 
	'numberposts'=>-1,
    'category' => $current_cat_id,
    'orderby'  => 'post_date',
    'order'    => 'DESC'
);
$posts = get_posts( $args );
// get IDs of posts retrieved from get_posts
$ids = array();
foreach ( $posts as $thepost ) {
    $ids[] = $thepost->ID;
}
// get and echo previous and next post in the same category
$thisindex = array_search( $post_id, $ids );
//print_r($ids);
$previd    = isset( $ids[ $thisindex - 1 ] ) ? $ids[ $thisindex - 1 ] : false;
$nextid    = isset( $ids[ $thisindex + 1 ] ) ? $ids[ $thisindex + 1 ] : false;
echo  '<div id="opagination">' ;
if (false !== $previd ) {
			?><a rel="prev" href="<?php echo get_permalink($previd) ?>"><span class="prevpost txt"><< Article plus récent </span><span><?php echo get_the_title($previd); ?></span></a><?php
}
if (false !== $nextid ) {
			?><a rel="next" href="<?php echo get_permalink($nextid) ?>"><span class="nextpost txt">Article plus ancien >></span> <span><?php echo get_the_title($nextid); ?> </span> </a><?php
}
			echo '</div>';
			
			?>