<?php
$content = <<<CONTENT
M18.r_16981 = {
"ltt": '2018/06/21 11:43',
"np": '0.050',
"iep": '0.000',
"iev": '0',
"ltp": '0.050',
"vol": '940000',
"tvr": '49860',
"dyh": '0.060',
"dyl": '0.049'
};
CONTENT;
preg_match("/(?<=vol\": ').*(?=',\s*\"tvr)/", $content, $output_array);
print_r(array_values($output_array));
preferences:
25.56 ms | 406 KiB | 5 Q