The php function that compares the intersection of time period one and time period two

 
/* 
* Comparison period 1 With the time 2 Is there an intersection  
*/ 
function isMixTime($begintime1,$endtime1,$begintime2,$endtime2) 
{ 
$status = $begintime2 - $begintime1; 
if($status>0){ 
$status2 = $begintime2 - $endtime1; 
if($status2>0){ 
return false; 
}else{ 
return true; 
} 
}else{ 
$status2 = $begintime1 - $endtime2; 
if($status2>0){ 
return false; 
}else{ 
return true; 
} 
} 
}