Check if the Email's Gravatar is exist. 檢測指定郵箱的Gravatar是否存在

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Check if the Email’s Gravatar is exist.
檢測指定郵箱的Gravatar是否存在
Example:
<pre><code>if(validate_gravatar("name@domain.com")){
 echo "This Email have Gravatar!";
}else{
 echo "This Email do not have Gravatar!";
}
</code></pre>

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