```php var_dump( build_suffix_image(".MP3")); function build_suffix_image($suffix, $background = null) { $suffix = mb_substr(strtoupper($suffix), 0, 4); $total = unpack('L', hash('adler32', $suffix, true))[1]; $hue = $total % 360; list($r, $g, $b) = hsv2rgb($hue / 360, 0.3, 0.9); $background = $background ? $background : "rgb({$r},{$g},{$b})"; $icon = <<<EOT <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 512 512" style="enable-background:new 0 0 512 512;" xml:space="preserve"> <path style="fill:#E2E5E7;" d="M128,0c-17.6,0-32,14.4-32,32v448c0,17.6,14.4,32,32,32h320c17.6,0,32-14.4,32-32V128L352,0H128z"/> <path style="fill:#B0B7BD;" d="M384,128h96L352,0v96C352,113.6,366.4,128,384,128z"/> <polygon style="fill:#CAD1D8;" points="480,224 384,128 480,128 "/> <path style="fill:{$background};" d="M416,416c0,8.8-7.2,16-16,16H48c-8.8,0-16-7.2-16-16V256c0-8.8,7.2-16,16-16h352c8.8,0,16,7.2,16,16 V416z"/> <path style="fill:#CAD1D8;" d="M400,432H96v16h304c8.8,0,16-7.2,16-16v-16C416,424.8,408.8,432,400,432z"/> <g><text><tspan x="220" y="380" font-size="124" font-family="Verdana, Helvetica, Arial, sans-serif" fill="white" text-anchor="middle">{$suffix}</tspan></text></g> </svg> EOT; return $icon; } function hsv2rgb($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) ]; } ```