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101 lines
2.3 KiB
101 lines
2.3 KiB
3 years ago
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<?php
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/**
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* 首字母头像
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* @param $text
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* @return string
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* 原作者：http://t.zoukankan.com/ccw869476711-p-13596791.html
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*/
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function letter_avatar($text)
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{
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$total = unpack('L', hash('adler32', $text, true))[1];
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$hue = $total % 360;
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list($r, $g, $b) = hsv2rgb($hue / 360, 0.3, 0.9);
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$bg = "rgb({$r},{$g},{$b})";
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$color = "#ffffff";
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$first = mb_strtoupper(mb_substr($text, 0, 1));
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$src = '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" height="100" width="100"><rect fill="' . $bg . '" x="0" y="0" width="100" height="100"></rect><text x="50" y="50" font-size="50" text-copy="fast" fill="' . $color . '" text-anchor="middle" text-rights="admin" alignment-baseline="central">' . $first . '</text></svg>';
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//$value = 'data:image/svg+xml;base64,' . $src;
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$value = $src;
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return $value;
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}
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function hsv2rgb($h, $s, $v)
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{
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$r = $g = $b = 0;
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$i = floor($h * 6);
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$f = $h * 6 - $i;
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$p = $v * (1 - $s);
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$q = $v * (1 - $f * $s);
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$t = $v * (1 - (1 - $f) * $s);
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switch ($i % 6) {
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case 0:
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$r = $v;
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$g = $t;
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$b = $p;
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break;
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case 1:
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$r = $q;
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$g = $v;
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$b = $p;
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break;
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case 2:
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$r = $p;
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$g = $v;
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$b = $t;
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break;
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case 3:
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$r = $p;
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$g = $q;
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$b = $v;
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break;
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case 4:
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$r = $t;
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$g = $p;
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$b = $v;
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break;
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case 5:
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$r = $v;
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$g = $p;
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$b = $q;
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break;
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}
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return [
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floor($r * 255),
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floor($g * 255),
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floor($b * 255)
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];
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}
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/**
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* 输出svg图像
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*/
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function output_ico() {
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//获取文字
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$text = @trim($_GET['text']);
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$text = empty($text) ? '空' : $text;
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//获取当前主机名
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$host = $_SERVER['HTTP_HOST'];
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//获取reffrer
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$referer = $_SERVER['HTTP_REFERER'];
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//如果referer和主机名不匹配，则禁止调用
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if ( ( !empty($referer) ) && ( !strstr($referer,$host) ) ) {
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exit('调用失败');
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}
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else{
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header('Cache-Control: max-age=604800');
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header('Content-Type:image/svg+xml');
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echo letter_avatar($text);
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}
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}
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//调用ico输出函数
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output_ico();
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