How does GLSL read a matrix?

[Mihai_Ionut_Floares]

Let's say I have a projection matrix:


GLSL thinks -(2*Zfar*Znear)/zm is at position in matrix 2x3 or at 3x2?
Should I set in my float[][](2D array)

projectionMatrix.mat[2][3] =  -(2*Zfar*Znear)/zm;

or

projectionMatrix.mat[3][2] =  -(2*Zfar*Znear)/zm;