function exec_callback($command, $callback){
$array = array();
exec($command, $array, $ret);
if(!empty($array)){
foreach ($array as $line){
call_user_func($callback, $line);
}
}
}
// example to use
function print_lines($line){
echo "> $line\n";
}
exec_callback("ping -c 10 www.baidu.com 2>&1 &", 'print_lines');
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