java - 哪位大哥帮忙翻译成PHP?

哪位大哥帮忙翻译成PHP? JAVA不懂, 对方没有PHP SDK 谢谢了.

<code class="lang-java">/**
   * 签名算法
   * 
   * @return
   * @throws Exception
   */
   public static String createSign(String param) throws Exception {
       StringBuffer result = new StringBuffer();
       MessageDigest md5 = MessageDigest.getInstance("MD5");
       md5.update(param.getBytes("UTF-8"));
       byte[] b = md5.digest();
       for(int i=0;i>>4;
           int l = x&0x0F;
           result.append((char)(h+((h</code>

回复内容：

哪位大哥帮忙翻译成PHP? JAVA不懂, 对方没有PHP SDK 谢谢了.

<code class="lang-java">/**
   * 签名算法
   * 
   * @return
   * @throws Exception
   */
   public static String createSign(String param) throws Exception {
       StringBuffer result = new StringBuffer();
       MessageDigest md5 = MessageDigest.getInstance("MD5");
       md5.update(param.getBytes("UTF-8"));
       byte[] b = md5.digest();
       for(int i=0;i>>4;
           int l = x&0x0F;
           result.append((char)(h+((h</code>

<code class="lang-php">function create_sign($src){
    return substr(md5($src), 8, 16);
}
</code>