php 生成 guid

function guid( $opt = true ){       //  Set to true/false as your default way to do this.

    if( function_exists('com_create_guid') ){

        if( $opt ){ return com_create_guid(); }

            else { return trim( 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 );    // "-"

            $left_curly = $opt ? chr(123) : "";     //  "{"

            $right_curly = $opt ? chr(125) : "";    //  "}"

            $uuid = $left_curly

                . substr( $charid, 0, 8 ) . $hyphen

                . substr( $charid, 8, 4 ) . $hyphen

                . substr( $charid, 12, 4 ) . $hyphen

                . substr( $charid, 16, 4 ) . $hyphen

                . substr( $charid, 20, 12 )

                . $right_curly;

            return $uuid;

            }

}
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php 生成 guid

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