関連ワード:  php check value in associative array    php find value in associative array    php search value in associative array    php check if value in associative array    php get min value in associative array    php get max value in associative array    php find value in multidimensional associative array    php search value in multidimensional associative array    php find duplicate values in associative array    php check if value exists in associative array