Is it possible to access PID in linux from PHP?

Question

linux

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2788 root      15  -5     0    0    0 S  2.0  0.0 404:43.97 md3_raid1
 7961 root      20   0  5964 2528 1684 R  2.0  0.2   0:00.14 top
 6629 root      20   0  8612 2884 2096 S  0.7  0.3   0:00.96 dovecot-auth
   57 root      15  -5     0    0    0 S  0.3  0.0   4:36.10 kblockd/0
 8703 ulogd     20   0 17700 4216  656 S  0.3  0.4  87:23.98 ulogd
11336 ldap      20   0  394M  15M 8292 S  0.3  1.5   5:29.28 slapd
25757 ldap      20   0  394M  15M 8292 S  0.3  1.5   5:11.71 slapd

There is a task to check the php script for the presence or absence of a certain process in the system. Can this be done somehow?
Is there access from php to commands like kill the process, etc., for example kill 11336

Answer 1

exec(), shell_exec() & co are not suitable?

Answer 2

php.net/manual/ru/function.getmypid.php or, as already mentioned, exec() and execute ps -aux | grep "php"

Answer 3

If there is a dira /proc/<pid>.
For each running process in Linux, the above dira is created. Inside are files that contain a lot of interesting things. Look at the contents of the directory yourself - there is a storehouse of information about the process.
To send signals to processes, you can use the posix_kill function (see the description in the puff manual). If this function is not available, then use exec, system, shell_exec, etc.