Quick PHP warning fix
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if ( is_array( $photos ) ) { $first_photo = array_pop( array_reverse( $photos ) ); }
causes a PHP Strict warning about passing by reference. I believe this is equivalent and supported in all PHP releases:
if ( is_array( $photos ) && count( $photos ) > 0 ) { $first_photo = array_values( $photos )[0]; }
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