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copied!<p><strong>Just because I had nothing better to do and I always like a challenge:</strong></p> <pre><code><?php // A few constants. define('DOWN', 0); define('LEFT', 3); define('RIGHT', 1); define('UP', 2); // Dictates the size of the spiral. $size = 11; // The initial number. $number = 0; // The initial direction. $direction = RIGHT; // The distance and number of points remaining before switching direction. $remain = $distance = 1; // The initial "x" and "y" point. $y = $x = round($size / 2); // The dimension of the spiral. $dimension = $size * $size; // Loop for ( $count = 0; $count < $dimension; $count++ ) { // Add the current number to the "x" and "y" coordinates. $spiral[$x][$y] = $number; // Depending on the direction, set the "x" or "y" value. switch ( $direction ) { case LEFT: $y--; break; case UP: $x--; break; case DOWN: $x++; break; case RIGHT: $y++; break; } // If the distance remaining is "0", switch direction. if ( --$remain == 0 ) { switch ( $direction ) { case DOWN: $direction = LEFT; $distance++; break; case UP: $distance++; default: $direction--; break; } // Reset the distance remaining. $remain = $distance; } // Increment the number or reset it to 0 if the number is 9. if ( $number < 9 ) $number++; else $number = 0; } // Sort by "x" numerically. ksort($spiral, SORT_NUMERIC); foreach ( $spiral as &$x ) { // Sort by "y" numerically. ksort($x, SORT_NUMERIC); foreach ( $x as $ykey => $y ) // Output the number. echo $y . ' '; // Skip a line. echo PHP_EOL; } </code></pre> <p><strong>Outputs:</strong></p> <pre><code>0 1 2 3 4 5 6 7 8 9 0 9 2 3 4 5 6 7 8 9 0 1 8 1 2 3 4 5 6 7 8 9 2 7 0 1 0 1 2 3 4 5 0 3 6 9 0 9 6 7 8 9 6 1 4 5 8 9 8 5 0 1 0 7 2 5 4 7 8 7 4 3 2 1 8 3 6 3 6 7 6 5 4 3 2 9 4 7 2 5 6 5 4 3 2 1 0 5 8 1 4 3 2 1 0 9 8 7 6 9 0 9 8 7 6 5 4 3 2 1 0 </code></pre>

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