\WPML_SEO_HeadLangs::head_langs

WPML_SEO_HeadLangs_head_langs.php

<?php

function head_langs() {
	$languages = $this->sitepress->get_ls_languages( array( 'skip_missing' => true ) );
	$languages = apply_filters( 'wpml_head_langs', $languages );
	// If there are translations and is not paged content...
	//Renders head alternate links only on certain conditions
	$the_post = get_post();
	$the_id   = $the_post ? $the_post->ID : false;
	$is_valid = is_array( $languages ) && count( $languages ) > 1 && ! is_paged() && ( ( ( is_single() || is_page() ) && $the_id && get_post_status( $the_id ) === 'publish' ) || ( is_home() || is_front_page() || is_archive() ) );
	if ( $is_valid ) {
		$hreflang_items = array();
		foreach ( $languages as $code => $lang ) {
			$alternate_hreflang                                            = apply_filters( 'wpml_alternate_hreflang', $lang['url'], $code );
			$hreflang_items[ $this->sitepress->get_language_tag( $code ) ] = str_replace( '&amp;', '&', $alternate_hreflang );
		}
		$hreflang_items = apply_filters( 'wpml_hreflangs', $hreflang_items );
		$hreflang = '';
		if ( is_array( $hreflang_items ) ) {
			foreach ( $hreflang_items as $hreflang_code => $hreflang_url ) {
				$hreflang .= '<link rel="alternate" hreflang="' . esc_attr( $hreflang_code ) . '" href="' . esc_url( $hreflang_url ) . '" />' . PHP_EOL;
			}
		}
		echo apply_filters( 'wpml_hreflangs_html', $hreflang );
	}
}