Php judges linux program problems-php Tutorial

Php judges linux program problems

Sometimes, when writing some scripts on the server, it is often necessary to put them in the crontab for regular operation. After a long time, there is a problem, that is, repeated running of the program consumes too much resources. how can this problem be solved? The following two methods are provided. Address: http://www.pooy.net/php-linux-grep.html // Pooy blog // Www.pooy.net // Welcome to the discussion! // Sometimes, when writing scripts on the server, it is often necessary to put them in crontab for regular operation. After a long time, there is a problem, that is, the program repeatedly consumes too much resources. how can this problem be solved? The following two methods are provided: // Method 1: use the regular expression matching in linux Function ifrun ($ clsname, $ bf = 0) { // Perform the following Check. if a process is running, it does 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 ('poo', 5 )) { Die ("pooy is running "); } // Note: pooy is the name of the program pooy. php! // Type 2: write the process to the file, 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 a string contained in the program! // Is the php program running more smoothly in linux? // Http://www.pooy.net/php-linux-grep.html