详解PHP如何把16进制的图片数据显示到网页

<?php

// 从数据库读出来的：图片的十六进制形式字符串
$icon_hex = &#39;89504e470d0a1a0a0000000d494844520000001c00000012010300000072c92ca&#39;
    .&#39;700000006504c5445000000ffffffa5d99fdd0000003f49444154089963603e6f60c000266cce1&#39;
    .&#39;b1f8010cc07406220c2febcf10724e2ffe7ff7082f90303e76466062061ccc0603999d90048d81&#39;
    .&#39;b30d809f3400800c0921ea36f9b656d0000000049454e44ae426082&#39;;
$imgdata = base64_encode(pack(&#39;H*&#39;,$icon_hex));
echo &#39;<img src="data:image/png;base64,&#39;. $imgdata .&#39;" />&#39;;

?>