How to write to named Linux pipe from PHP? -

i have following bash script:

server_control_pipe="/var/custom_pipe_file_name" init_script="/usr/sbin/service [somedaemon]"  mkfifo -m 666 "$server_control_pipe"  while read line <"$server_control_pipe"    echo "received $line"   if [[ "$line" == 'stop' ]];     $init_script stop   elif [[ "$line" == 'start' ]];     $init_script start   elif [[ "$line" == 'stoppipe' ]];     break   fi   echo "waiting..." done  echo "end" 

...and following php script:

<?php define('server_control_pipe', "/var/custom_pipe_file_name");  if(false === file_put_contents(server_control_pipe, "start\n", file_append))     throw new exception("could not write server control pipe"); 

when running php script, loop in bash script seems terminate , bash script outputs end.

to try find out why that, replaced php script code:

<?php define('server_control_pipe', "/var/custom_pipe_file_name");  $f = fopen(server_control_pipe, 'w'); if(false === $f)     throw new exception("could not open server control pipe");  $ret = fwrite($f, 'start\n'); if(false === $ret)     throw new exception("could not write server control pipe");  fclose($f); 

i found out bash script loop terminates whenever fopen called.

so question boils down to: how have open pipe in php in order not break bash script loop?

if want script run time should have while true instead of while read line, eg:

while :     echo "press [ctrl+c] stop.."     sleep 1 done 

if read line read file contents of file @ state , finish execution.