What are some common pitfalls when trying to define line colors in PHP code?

One common pitfall when trying to define line colors in PHP code is not using the correct syntax for specifying colors. To define line colors in PHP, you need to use the hexadecimal color code preceded by a hash symbol (#). Another pitfall is not properly escaping the color code if it contains special characters. To avoid these pitfalls, make sure to use the correct syntax and escape any special characters in the color code.

// Incorrect way of defining line color
$lineColor = "red"; // This will not work

// Correct way of defining line color
$lineColor = "#ff0000"; // Hexadecimal color code for red

// Escaping special characters in color code
$lineColor = "#ff00ff"; // Hexadecimal color code for magenta