PHP can't open file in thread running context - php

Question

i' m working on a monitor for a structure composed by a lot of computers. I develop it in PHP and i want to ping all the structure by the quickest way.
For this i use the multi-thread inherited from pthread enter link description here So i follow some tutorials and finally i have one class (extended from Thread) and a caller in an other script :
The class :
class Ping extends Thread{
public $id;
public $name;
public function __construct($id, $name){
$this->id = $id;
$this->name = $name;
}
public function run(){
$ping = exec("ping -n 1 -w 80 " . $this->name);
$h = fopen("ping.json", 'w');
if(preg_match("#perte 100#", $ping)){
fwrite($h,'d');
}
else {
fwrite($h,'c');
}
fclose($h);
}
}
The caller :
$p = array();
foreach($array_computer as $comp){
array_push($p, new Ping(array_search ($comp , $array_computer), $comp->{'name'}));
}
foreach ($p as $p_t){
$p_t->start(PTHREADS_INHERIT_ALL);
}
So i have two problems :
1 . When i want to echo $id or $name, nothing is display
2 . I can't open 'ping.json' because : "failed to open stream: Permission denied"
If i replace
$p_t->start(PTHREADS_INHERIT_ALL);
by
$p_t->run();
The call works but i lose the interest of multithread :P

Answer 1

Could it be var $p_t that is an instance of Ping?
foreach ($p as $p_t)
Also try checking for instance ie.
if ($p_t instanceof Ping) {
$p_t->start();
}

Answer 2

Some question/remarks to help you along:
you are writing something to a file based on a computername, but has
this name a value? Otherwise the output file will be empty and you
won't get a result.
Within the foreach, echo the parameters you want to store in $p so
you know you are putting something in there.
where does the start method come from? Is $p an array of objects
object? Is so, where is the method declared?
$comp->{'name'} looks odd to me; why not use $comp->name if it's an
object or $comp['name'] if it's an array?
you are not storing any resulting values in your public variables; therefore
when an input value is blank, it wil stay blank.

Answer 3

Thanks for answers,
i found an other solution by storing data results in a database into the run() function.
I think that some conflicts appeared when i want to write the json file at the same time, and lock the file with flock() wasn't efficient.
I put the Ping class and the caller in the same file and ordinate the thread excution like this :
$i = 0;
foreach ($p as $p_t){
while($i > 15){}
$i++;
$p_t->start();
if($p_t->join())$i--;
}