I want to create a specific-sized random "key" for every row in the database table. For example, for the "id" or row (auto-increment ID) "20", the column "key" will have "xEd456" and for row 21, it will be e.g. "rYU875". However, I also want to make sure there is no way there is a duplicate "key" in the table. I prefer to have 6-char "key". How do I achieve this?
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- dsfgdsjfd78773 2013-03-11 06:58关注
That means you need a alphanumeric key, see the code
while(true) { $str=""; for($i=0;$i<6;$i++) { $rnd=rand(1,16); if(intval(fmod($rnd, 2))) $a=rand(48,57); else $a=rand(65,90); $str .= chr($a); } // skipping the mysql connection functions $sql=mysql_query(“select user_id from user_master_table where user_id_alias='".$str."'"); $rs=mysql_fetch_array($sql); if($rs["user_id"]=="") break; }
You are free to change the loop value and random number range.
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