Important for wordpress

// get thumbanil url
function get_thumbanil_url($post,$image_size){

	if ( has_post_thumbnail($post->ID) ) { 
        $thumbnail_url = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID),$image_size, true );
        $thumb_url = $thumbnail_url[0];
     }
     else{
        $thumb_url = '';
     }
     return $thumb_url;

}
//<?php echo get_thumbanil_url($post,'full'); ?>
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// allow span and other tags
function override_mce_options($initArray) {
	$opts = '*[*]';
	$initArray['valid_elements'] = $opts;
	$initArray['extended_valid_elements'] = $opts;
	return $initArray;
} 
add_filter('tiny_mce_before_init', 'override_mce_options');

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// get category name and href
function get_cat_name_href($post_id){
	$cats = array();
	foreach (get_the_category($post_id) as $c) {
	 $cat = get_category($c);
	 $wurl = '<a href="' . esc_url( get_category_link( $cat->term_id ) ) . '" alt="' . esc_attr( sprintf( __( 'View all posts in %s', 'textdomain' ), $cat->name ) ) . '">' . esc_html( $cat->name ) . '</a>';
	array_push($cats, $wurl);
	}
	if (sizeOf($cats) > 0) {
	$post_categories = implode(', ', $cats);
	} else {
	$post_categories = '';
	}
	return $post_categories;
}
------------------------------------------------------------------
// camelCase
function camelCase($str, array $noStrip = [])
{
    // non-alpha and non-numeric characters become spaces
    $str = preg_replace('/[^a-z0-9' . implode("", $noStrip) . ']+/i', ' ', $str);
    $str = trim($str);
    // uppercase the first character of each word
    $str = ucwords($str);
    $str = str_replace(" ", "", $str);
    $str = lcfirst($str);

    return $str;
}
--------------------------------------------------------------------

// get Next previous link 
function getNextPreviousUrl()
{         
    $prev_post = get_previous_post();
    $next_url = ''; $next_title = '';  $prev_title = ''; $prev_url = '';
    if($prev_post) {
        $prev_title = strip_tags(str_replace('"', '', $prev_post->post_title));
        $prev_title = !empty($prev_title) ? $prev_title : '';
    	$prev_url = get_permalink($prev_post->ID) ;
    	$prev_url = !empty($prev_url) ? $prev_url : '';
    }

    $next_post = get_next_post();
    if($next_post) {
      	$next_title = strip_tags(str_replace('"', '', $next_post->post_title));
      	$next_title = !empty($next_title) ? $next_title : '';
        $next_url =  get_permalink($next_post->ID);
        $next_url = !empty($next_url) ? $next_url : '';
    }

    return([$next_url, $next_title, $prev_title, $prev_url]);
}
//list($next_url, $next_title, $prev_title, $prev_url) = getNextPreviousUrl();