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首字母头像


if (!function_exists('letter_avatar')) {
/**
* 首字母头像
* @param $text
* @return string
*/
function letter_avatar($text)
{
//unpack() 函数从二进制字符串对数据进行解包。
//hash() 生成哈希值
$total = unpack('L', hash('adler32', $text, true))[1];
$hue = $total % 360;
list($r, $g, $b) = hsv2rgb($hue / 360, 0.3, 0.9);

$bg = "rgb({$r},{$g},{$b})";
$color = "#ffffff";
//mb_substr截取
//mb_strtoupper 使字符串大写
$first = mb_strtoupper(mb_substr($text, 0, 1));
//base64_encode 64编码话
$src = base64_encode('<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>');
$value = 'data:image/svg+xml;base64,' . $src;
return $value;
}
}
//生成颜色
if (!function_exists('hsv2rgb')) {
function hsv2rgb($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)
];
}
}


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