Михаил Р.

<?php

$file = fopen("./file.txt", "r");

$arr = [];

while(!feof($file))
{
  $buffer = fgets($file);

  preg_match('/\d+\s?\d+/', $buffer, $match);

  $arr[] = $match;
}

fclose($file);

print_r($arr);

curl_setopt($ch, CURLOPT_POSTFIELDS, ['file1' => new CurlFile($file_path)]);

onchange = script [CT]
The onchange event occurs when a control loses the input focus and its value has been modified since gaining focus. This attribute applies to the following elements: INPUT, SELECT, and TEXTAREA.

if ("createEvent" in document) {
    var evt = document.createEvent("HTMLEvents");
    evt.initEvent("change", false, true);
    element.dispatchEvent(evt);
}
else
    element.fireEvent("onchange");