Code:
<?php
$myColor="0000ff";
?>
I have a variable named $myColor like the above.

I like to verify whether the value of $myColor is color code or not.

The following code doesn't work correctly, but I hope it shows what I want.
Code:
code1

<?php
$myColor="0000ff";

if ( is_colorCode($myColor) )
{echo yes;}
else
{ echo no;}
?>

result1

yes


Code:
code2

<?php
$myColor="0xy0000";

if ( is_colorCode($myColor) )
{echo yes;}
else
{ echo no;}
?>

result2

no