php生成uuid(guid) 

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<?php
function  uuid()  
{  
$chars = md5(uniqid(mt_rand(), true));  
$uuid = substr ( $chars, 0, 8 ) . '-'
        . substr ( $chars, 8, 4 ) . '-' 
        . substr ( $chars, 12, 4 ) . '-'
        . substr ( $chars, 16, 4 ) . '-'
        . substr ( $chars, 20, 12 );  
return $uuid ;  
}  
echo  uuid();
//生成后格式82796f26-ee3c-f32d-997f-42479f66f8ff
?>

另一种生成方法：

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function guid(){
if (function_exists('com_create_guid')){
    return com_create_guid();
}else{
    mt_srand((double)microtime()*10000);//optional for php 4.2.0 and up.
    $charid = strtoupper(md5(uniqid(rand(), true)));
    $hyphen = chr(45);// "-"
    $uuid =// chr(123)
            substr($charid, 0, 8).$hyphen
            .substr($charid, 8, 4).$hyphen
            .substr($charid,12, 4).$hyphen
            .substr($charid,16, 4).$hyphen
            .substr($charid,20,12);
            //.chr(125);
    return $uuid;
}
}
echo guid();

🔰本文标题： php生成uuid(guid)

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