php cron jobs overlapping

Hi I wrote few months back a script in perl for checking overlapping of jobs

use Fcntl ':flock';
INIT {
    my $waitcount=12; # possible attemtps to run script
    my $waitseconds=300; # wait for $waitseconds each attempt
    my $lockstatus=0;#no lock was attained
    while ($waitcount > 0){
          if (open LH, $0){
                while ($waitcount > 0){
                   if (flock LH, LOCK_EX|LOCK_NB){
                       $waitcount=0;#signal end of waiting
                       $lockstatus=1;#lock was attained
                   }
                   else{
                       --$waitcount;#decrement waitcount
                       print "waiting to be able to lock $0\n";
                       sleep $waitseconds;
                   }#end else
                }#end while
          }#end if
          else{
              --$waitcount;#decrement waitcount
              print "waiting to be able to open $0\n";
开发者_如何学Python              sleep $waitseconds;
          }#end else
    }#end while
    if ($lockstatus == 0){
         die "no lock was attained\n";
    }#end if
}

I wanted to know if we can do similar thing in php ..

How to integrate with your current php code which is running a part of php jobs?

Of course you can. The only specific feature which you use is "flock" and thats available also in php (see flock doc).

The other steps are pretty similar:

• replace "my" with "$"
• init block with a while(1) loop
• die with exit
• and the if cases to php representation