PHP determines linux program problems

Sometimes when writing some scripts on the server, they often need to be put into crontab to run regularly. After a long time, there will be a problem, that is, the repeated running of the program consumes too many resources. How to deal with it? Puyu wrote two methods below.
Original address: http://www.pooy.net/php-linux-grep.html

//Pooy Blog
// www.pooy.net
// Welcome to communicate and discuss!
//Sometimes when writing some scripts on the server, they often need to be put into crontab to run regularly. After a long time, there will be a problem, that is, the repeated operation of the program consumes too many resources. How to deal with it? Puyu wrote two methods below:
//The first one: use regular matching in Linux

function ifrun($clsname,$bf = 0)
{
 //Detect below, if there is a process running , it will not run
 $str=shell_exec("/bin/ps ax > /home/root/".$clsname."_run.txt");
 $str=shell_exec("/bin/grep -c '" .$clsname.".php' /home/root/".$clsname."_run.txt");

 if($bf >0)
 {
 if($str >=$bf)
 {
 return 1;
 }
 else
 {
 return 0;
 }
 }
 else
 {
 if ($str>=2)
 {
 return 1;
 }
 else
 {
 return 0;
 }
 }
}

//Call:

if (ifrun('pooy',5))
{
 die("pooy is running");
}


//Remarks: pooy is the program pooy.php name!

//The second method: write the process into the file, then use the file function to read and match the string

system('ps -ef |grep wget > /root/pooy.txt');
 $arr=file('/root/pooy.txt');
$total=count($arr);
for($i=0;$i<$total;$i++){
 $count=array() ;
 if(stristr($arr[$i],'www/pooy') !== FALSE) {
 //echo '"earth" not found in string';
 $count[]='no';
 break;
 }

}

if(count($count) >= 1 )
{
 echo "A same programs are running";
 exit();
}else
{
 echo "start________________________________________________";
 }


//Note: "www/pooy" is the string contained in the program!

//Is the PHP program running much more smoothly now on Linux?

//Download address: http://www.pooy.net/php-linux-grep.html