Program to check if a matrix is symmetric | Efficient PHP code for check a matrix is symmetric or not . ; Returns true if mat [ N ] [ N ] is symmetric , else false ; Driver code
< ? php $ MAX = 100 ; function isSymmetric ( $ mat , $ N ) { for ( $ i = 0 ; $ i < $ N ; $ i ++ ) for ( $ j = 0 ; $ j < $ N ; $ j ++ ) if ( $ mat [ $ i ] [ $ j ] != $ mat [ $ j ] [ $ i ] ) return false ; return true ; } $ mat = array ( array ( 1 , 3 , 5 ) , array ( 3 , 2 , 4 ) , array ( 5 , 4 , 1 ) ) ; if ( isSymmetric ( $ mat , 3 ) ) echo ( " Yes " ) ; else echo ( " No " ) ; ? >