PHP Function to return upper and lower time stamp of a given date

Function to return upper and lower time stamp of a given date Function returns the upper and lower time stamp of a given date in dd/mm/yyyy format. checks date in dd/mm/yyy format is valid and return upper/lower limit of timestamp of that day as integer if date is invalid then returns 0 // $upper_or_lower = U or L if date is null this will return current time stamp
function getTimeStamp($Date="",$upper_or_lower="l"){ //checks date in dd/mm/yyy format is valid and return upper/lower limit of timestamp of that day as integer //if date is invalid then returns 0 // $upper_or_lower = U or L //if date is null thsi will return current timestamp $timemsg=""; if(trim($Date)=="") $timemsg=time(); else{ //spilit dates in parts $DateParts = split( "[/-]" , $Date ); if( checkdate($DateParts[1],$DateParts[0],$DateParts[2]) ){ if( strtolower($upper_or_lower)=="u" ) $timemsg=mktime( 23,59,59,$DateParts[1],$DateParts[0], $DateParts[2] ); else $timemsg=mktime( 0,0,0,$DateParts[1],$DateParts[0], $DateParts[2] ); }else $timemsg=0; } return $timemsg; } How to call this function? $lowerTimeStamp= getTimeStamp("22/10/2010","l"); $upperTimeStamp= getTimeStamp("22/10/2010","u"); $currentTimeStamp= getTimeStamp();