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* @param string $script_id

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* @return void

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public function async_script_tag( $script_id ) {

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add_filter(

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'script_loader_tag',

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function( $tag, $handle, $src ) use ( $script_id ) {

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// check against our registered script handle

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if ( $script_id === $handle ) {

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if ( strpos( $tag, 'async' ) === false ) {

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// add attributes of your choice

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$tag = str_replace( '<script ', '<script async=\'async\' ', $tag );

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}

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}

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return $tag;

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31, // async for WordPress plugin uses 20

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);

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}

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}

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