' . $first . '';
//$value = 'data:image/svg+xml;base64,' . $src;
$value = $src;
return $value;
}
function hsv2rgb($h, $s, $v)
{
$r = $g = $b = 0;
$i = floor($h * 6);
$f = $h * 6 - $i;
$p = $v * (1 - $s);
$q = $v * (1 - $f * $s);
$t = $v * (1 - (1 - $f) * $s);
switch ($i % 6) {
case 0:
$r = $v;
$g = $t;
$b = $p;
break;
case 1:
$r = $q;
$g = $v;
$b = $p;
break;
case 2:
$r = $p;
$g = $v;
$b = $t;
break;
case 3:
$r = $p;
$g = $q;
$b = $v;
break;
case 4:
$r = $t;
$g = $p;
$b = $v;
break;
case 5:
$r = $v;
$g = $p;
$b = $q;
break;
}
return [
floor($r * 255),
floor($g * 255),
floor($b * 255)
];
}
/**
* 输出svg图像
*/
function output_ico() {
//获取文字
$text = @trim($_GET['text']);
$text = empty($text) ? '空' : $text;
//获取当前主机名
$host = $_SERVER['HTTP_HOST'];
//获取reffrer
$referer = $_SERVER['HTTP_REFERER'];
//如果referer和主机名不匹配，则禁止调用
if ( ( !empty($referer) ) && ( !strstr($referer,$host) ) ) {
exit('调用失败');
}
else{
header('Cache-Control: max-age=604800');
header('Content-Type:image/svg+xml');
echo letter_avatar($text);
}
}
//调用ico输出函数
output_ico();