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wpml_alternate_hreflang
Get the URL to be filtered and the corresponding language code.

availability:

WPML Version: 3.3.7

description:

This filter receives the URL to be filtered, as well as the corresponding language code.

type:
category:
Site-Wide Language Information
parameters:
hook example usage:
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$alternate_hreflang = apply_filters( 'wpml_alternate_hreflang', $lang['url'], $lang['code'] );

To filter the HTML of the produced set of link tags with you can use the following code:

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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 );