original_string: public static function Rx($phi, array &$r) {
      $s;
      $c;
      $a10;
      $a11;
      $a12;
      $a20;
      $a21;
      $a22;
  
      $s = sin($phi);
      $c = cos($phi);
  
      $a10 = $c * $r[1][0] + $s * $r[2][0];
      $a11 = $c * $r[1][1] + $s * $r[2][1];
      $a12 = $c * $r[1][2] + $s * $r[2][2];
      $a20 = - $s * $r[1][0] + $c * $r[2][0];
      $a21 = - $s * $r[1][1] + $c * $r[2][1];
      $a22 = - $s * $r[1][2] + $c * $r[2][2];
  
      $r[1][0] = $a10;
      $r[1][1] = $a11;
      $r[1][2] = $a12;
      $r[2][0] = $a20;
      $r[2][1] = $a21;
      $r[2][2] = $a22;
  
      return;
    }
code: public static function Rx($phi, array &$r) {
      $s;
      $c;
      $a10;
      $a11;
      $a12;
      $a20;
      $a21;
      $a22;
  
      $s = sin($phi);
      $c = cos($phi);
  
      $a10 = $c * $r[1][0] + $s * $r[2][0];
      $a11 = $c * $r[1][1] + $s * $r[2][1];
      $a12 = $c * $r[1][2] + $s * $r[2][2];
      $a20 = - $s * $r[1][0] + $c * $r[2][0];
      $a21 = - $s * $r[1][1] + $c * $r[2][1];
      $a22 = - $s * $r[1][2] + $c * $r[2][2];
  
      $r[1][0] = $a10;
      $r[1][1] = $a11;
      $r[1][2] = $a12;
      $r[2][0] = $a20;
      $r[2][1] = $a21;
      $r[2][2] = $a22;
  
      return;
    }
code_tokens: public static function Rx ( $ phi , array & $ r ) { $ s ; $ c ; $ a10 ; $ a11 ; $ a12 ; $ a20 ; $ a21 ; $ a22 ; $ s = sin ( $ phi ) ; $ c = cos ( $ phi ) ; $ a10 = $ c * $ r [ 1 ] [ 0 ] + $ s * $ r [ 2 ] [ 0 ] ; $ a11 = $ c * $ r [ 1 ] [ 1 ] + $ s * $ r [ 2 ] [ 1 ] ; $ a12 = $ c * $ r [ 1 ] [ 2 ] + $ s * $ r [ 2 ] [ 2 ] ; $ a20 = - $ s * $ r [ 1 ] [ 0 ] + $ c * $ r [ 2 ] [ 0 ] ; $ a21 = - $ s * $ r [ 1 ] [ 1 ] + $ c * $ r [ 2 ] [ 1 ] ; $ a22 = - $ s * $ r [ 1 ] [ 2 ] + $ c * $ r [ 2 ] [ 2 ] ; $ r [ 1 ] [ 0 ] = $ a10 ; $ r [ 1 ] [ 1 ] = $ a11 ; $ r [ 1 ] [ 2 ] = $ a12 ; $ r [ 2 ] [ 0 ] = $ a20 ; $ r [ 2 ] [ 1 ] = $ a21 ; $ r [ 2 ] [ 2 ] = $ a22 ; return ; }
docstring: - - - - - -
  i a u R x
  - - - - - -
  
  Rotate an r-matrix about the x-axis.
  
  This function is part of the International Astronomical Union's
  SOFA (Standards Of Fundamental Astronomy) software collection.
  
  Status:  vector/matrix support function.
  
  Given:
  phi    double          angle (radians)
  
  Given and returned:
  r      double[3][3]    r-matrix, rotated
  
  Notes:
  
  1) Calling this function with positive phi incorporates in the
  supplied r-matrix r an additional rotation, about the x-axis,
  anticlockwise as seen looking towards the origin from positive x.
  
  2) The additional rotation can be represented by this matrix:
  
  (  1        0            0      )
  (                               )
  (  0   + cos(phi)   + sin(phi)  )
  (                               )
  (  0   - sin(phi)   + cos(phi)  )
  
  This revision:  2013 June 18
  
  SOFA release 2015-02-09
  
  Copyright (C) 2015 IAU SOFA Board.  See notes at end.
docstring_tokens: - - - - - - i a u R x - - - - - -