<?php

	/***  
	* Configuration:  
	*
	*	$CONFIG = array(
	*		'warning' => 15, 	-> number of running processes as threshold for status warning
	*		'critical' => 20,	-> number of running processes as threshold for status critical
	*		'process' => 'apache'	-> label of the process to match within the 'ps -efa' command output
	*	);
	*/


	$CONFIG = array(
		'warning' => 15,
		'critical' => 20,
		'process' => 'apache'
	);

	
	// exec command
	$command = "ps -efa | grep ". $CONFIG['process'] ." | wc -l";
	exec($command, $output);

	// output result
	$count = trim($output[0]);

	if ($CONFIG['critical'] > 0 and $count >= $CONFIG['critical']) {
		echo 'FAILURE: '. $count .' '. $PROCESS .' processes|performance:'. $count;
	}
	elseif ($CONFIG['warning'] > 0 and $count >= $CONFIG['warning']) {
		echo 'WARNING: '. $count .' '. $CONFIG['process'] .' processes|performance:'. $count;
	}
	else {
		echo 'OK: '. $count .' '. $CONFIG['process'] .' processes|performance:'. $count;
	}

?>