PHP从MYSQL数据库中随机读取若干条数据，并将数据合并为一条数据，在赋值给一个变量。要怎么实现

你要随机，表里就给有一个ID

function rands($num,$max){

for($i=0$i<$num$i++){

$a[]=rand(0,$max)

}

return $a

}

$a=implode(',',$a)

$sql="select * from tablename where id in($a)"

$rl=mysql_query($sql)

while($r=mysql_fetch_array($rl)){

$str.=$r['title']

}

echo $str

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