関連ワード:  php find in multidimensional array by value    php find in multidimensional array    php find in multidimensional array by key    php find in 2d array    php find duplicates in multidimensional array    php find element in multidimensional array    php find index in multidimensional array by value    php find string in multidimensional array    php find index in multidimensional array    php find value in multidimensional array by key