Display the use of static to achieve the color of the table interlaced display
In practical programming applications, we often forget about static functions. Have a good reflection. ：）
We use PHP to query the data from the database, and output the results to the browser, if the results are many rows, the table bgcolor if all are monochrome, the viewer will not feel very comfortable. So how do you make the rows in the table different colors?
Please look below:
?
function GetColor ()
{
static $colorvalue;//define a statically variable
if ($colorvalue = = "#ffffff")
$colorvalue = "#000000";
else $colorvalue = "#ffffff";
return ($colorvalue);
}
Print ("<table border=1>n");//output 10 lines below
For ($i =0 $i <10; $i + +)
{$bcolor =getcolor ()//Change background color
Print ("<tr bgcolor= $bcolor >n");
Print ("<td> $i </td>n");
Print ("</tr>");
}
Print ("</table>n");
Description
A static variable is defined in this program $colorvalue meaning that after the function call ends, the
This variable $colorvalue also retains the value and does not disappear. When the GetColor () function is called again, the value of the variable $colorvalue is the $colorvalue value at the end of the last function call.
