PHP / CSS onmouseover和onmouse out不适用于PHP echo

Question

Here I want to style my table with css. But when I try to add this events inside echo, it says,

Parse error: syntax error, unexpected 'this' (T_STRING), expecting ',' or ';' in E:\xampp\htdocs\Ceylon Aviation\Flights.php on line 146

As I'm a beginner to PHP, I can't figure out the exact error. Any helpful suggestions to edit my code? Thank You!

My Code:

echo "<tr onmouseover = /"this.style.backgroundColor = /'#ffff66' ; " onmouseout = /"this.style.backgroundColor = /'#d4e3e5';">";

Answer 1

This works too:

    echo "<tr onmouseover='this.style.backgroundColor=#ffff66' onmouseout='this.style.backgroundColor=#d4e3e5'>";