I have following code block for a tic-tac-toe's game. Please help me simplifying it.
$grid=array();
$grid[0]=array(' ',' ',' ');
$grid[1]=array(' ',' ',' ');
$grid[2]=array(' ',' ',' ');
$user='X';
$com='O';
$ran=0;
//For user
if(($grid[0][1]==$grid[0][2])&&$grid[0][1]!=' '&&$grid[0][0]==' '){$ran=1;}
if(($grid[1][0]==$grid[2][0])&&$grid[1][0]!=' '&&$grid[0][0]==' '){$ran=1;}
if(($grid[1][1]==$grid[2][2])&&$grid[1][1]!=' '&&$grid[0][0]==' '){$ran=1;}
if(($grid[0][0]==$grid[0][2])&&$grid[0][0]!=' '&&$grid[0][1]==' '){$ran=2;}
if(($grid[1][1]==$grid[2][1])&&$grid[1][1]!=' '&&$grid[0][1]==' '){$ran=2;}
if(($grid[0][0]==$grid[0][1])&&$grid[0][0]!=' '&&$grid[0][2]==' '){$ran=3;}
if(($grid[1][1]==$grid[2][0])&&$grid[1][1]!=' '&&$grid[0][2]==' '){$ran=3;}
if(($grid[1][2]==$grid[2][2])&&$grid[1][2]!=' '&&$grid[0][2]==' '){$ran=3;}
if(($grid[0][0]==$grid[2][0])&&$grid[0][0]!=' '&&$grid[1][0]==' '){$ran=4;}
if(($grid[1][1]==$grid[1][2])&&$grid[1][1]!=' '&&$grid[1][0]==' '){$ran=4;}
if(($grid[0][0]==$grid[2][2])&&$grid[0][0]!=' '&&$grid[1][1]==' '){$ran=5;}
if(($grid[0][1]==$grid[2][1])&&$grid[0][1]!=' '&&$grid[1][1]==' '){$ran=5;}
if(($grid[0][2]==$grid[2][0])&&$grid[0][2]!=' '&&$grid[1][1]==' '){$ran=5;}
if(($grid[1][0]==$grid[1][2])&&$grid[1][0]!=' '&&$grid[1][1]==' '){$ran=5;}
if(($grid[0][2]==$grid[2][2])&&$grid[0][2]!=' '&&$grid[1][2]==' '){$ran=6;}
if(($grid[1][0]==$grid[1][1])&&$grid[1][0]!=' '&&$grid[1][2]==' '){$ran=6;}
if(($grid[0][0]==$grid[1][0])&&$grid[0][0]!=' '&&$grid[2][0]==' '){$ran=7;}
if(($grid[0][2]==$grid[1][1])&&$grid[0][2]!=' '&&$grid[2][0]==' '){$ran=7;}
if(($grid[2][1]==$grid[2][2])&&$grid[2][1]!=' '&&$grid[2][0]==' '){$ran=7;}
if(($grid[0][1]==$grid[1][1])&&$grid[0][1]!=' '&&$grid[2][1]==' '){$ran=8;}
if(($grid[2][0]==$grid[2][2])&&$grid[2][0]!=' '&&$grid[2][1]==' '){$ran=8;}
if(($grid[0][0]==$grid[1][1])&&$grid[0][0]!=' '&&$grid[2][2]==' '){$ran=9;}
if(($grid[0][2]==$grid[1][2])&&$grid[0][2]!=' '&&$grid[2][2]==' '){$ran=9;}
if(($grid[2][0]==$grid[2][1])&&$grid[2][0]!=' '&&$grid[2][2]==' '){$ran=9;}
//For computer
if(($grid[0][1]==$grid[0][2])&&$grid[0][1]==$com&&$grid[0][0]==' '){$ran=1;}
if(($grid[1][0]==$grid[2][0])&&$grid[1][0]==$com&&$grid[0][0]==' '){$ran=1;}
if(($grid[1][1]==$grid[2][2])&&$grid[1][1]==$com&&$grid[0][0]==' '){$ran=1;}
if(($grid[0][0]==$grid[0][2])&&$grid[0][0]==$com&&$grid[0][1]==' '){$ran=2;}
if(($grid[1][1]==$grid[2][1])&&$grid[1][1]==$com&&$grid[0][1]==' '){$ran=2;}
if(($grid[0][0]==$grid[0][1])&&$grid[0][0]==$com&&$grid[0][2]==' '){$ran=3;}
if(($grid[1][2]==$grid[2][2])&&$grid[1][2]==$com&&$grid[0][2]==' '){$ran=3;}
if(($grid[1][1]==$grid[2][0])&&$grid[1][1]==$com&&$grid[0][2]==' '){$ran=3;}
if(($grid[1][1]==$grid[1][2])&&$grid[1][1]==$com&&$grid[1][0]==' '){$ran=4;}
if(($grid[0][0]==$grid[2][0])&&$grid[0][0]==$com&&$grid[1][0]==' '){$ran=4;}
if(($grid[1][0]==$grid[1][2])&&$grid[1][0]==$com&&$grid[1][1]==' '){$ran=5;}
if(($grid[0][1]==$grid[2][1])&&$grid[0][1]==$com&&$grid[1][1]==' '){$ran=5;}
if(($grid[0][0]==$grid[2][2])&&$grid[0][0]==$com&&$grid[1][1]==' '){$ran=5;}
if(($grid[0][2]==$grid[2][0])&&$grid[0][2]==$com&&$grid[1][1]==' '){$ran=5;}
if(($grid[1][0]==$grid[1][1])&&$grid[1][0]==$com&&$grid[1][2]==' '){$ran=6;}
if(($grid[0][2]==$grid[2][2])&&$grid[0][2]==$com&&$grid[1][2]==' '){$ran=6;}
if(($grid[2][1]==$grid[2][2])&&$grid[2][1]==$com&&$grid[2][0]==' '){$ran=7;}
if(($grid[0][0]==$grid[1][0])&&$grid[0][0]==$com&&$grid[2][0]==' '){$ran=7;}
if(($grid[0][2]==$grid[1][1])&&$grid[0][2]==$com&&$grid[2][0]==' '){$ran=7;}
if(($grid[2][0]==$grid[2][2])&&$grid[2][0]==$com&&$grid[2][1]==' '){$ran=8;}
if(($grid[0][1]==$grid[1][1])&&$grid[0][1]==$com&&$grid[2][1]==' '){$ran=8;}
if(($grid[0][1]==$grid[1][1])&&$grid[0][1]==$com&&$grid[2][1]==' '){$ran=8;}
if(($grid[2][0]==$grid[2][1])&&$grid[2][0]==$com&&$grid[2][2]==' '){$ran=9;}
if(($grid[0][2]==$grid[1][2])&&$grid[0][2]==$com&&$grid[2][2]==' '){$ran=9;}
if(($grid[0][0]==$grid[1][1])&&$grid[0][0]==$com&&$grid[2][2]==' '){$ran=9;}
return $ran;
Here grid is an 2d array of game's grid and ran is the next position of computer's move. 1 for [0][0], 2 for [0][1],....,8 for [2][1] and 9 for [2][2]
The code is working fine but need to reduce it.