In my php code, two ways,
('#201707',$cont_array[$i],'N') or ('#201707','$cont_array[$i]','N') failed during insert into table hpc_review
$transmit_next="<input value='allDel' type='button'><br>John<br>snow<br>stack<br>";
$cont_array = explode("<br>", $transmit_next);
for($i=1;$i<count($cont_array);$i++)
{
$query="insert into hpc_review (sysnum,handler,stat) values ('#201707',$cont_array[$i],'N');";
$stat = $conn->query($query);
}