<?php
$array = [
[ 'company_name' => 'Tata' ],
[ 'company_name' => 'reliance' ],
[ 'company_name' => 'nisan' ],
[ 'company_name' => 'lg' ],
];
$newArray = array_map(function ($item) { return $item['company_name']; }, $array);
PD9waHAKCiRhcnJheSA9IFsKCVsgJ2NvbXBhbnlfbmFtZScgPT4gJ1RhdGEnIF0sCglbICdjb21wYW55X25hbWUnID0+ICdyZWxpYW5jZScgXSwKCVsgJ2NvbXBhbnlfbmFtZScgPT4gJ25pc2FuJyBdLAoJWyAnY29tcGFueV9uYW1lJyA9PiAnbGcnIF0sCl07CgokbmV3QXJyYXkgPSBhcnJheV9tYXAoZnVuY3Rpb24gKCRpdGVtKSB7IHJldHVybiAkaXRlbVsnY29tcGFueV9uYW1lJ107IH0sICRhcnJheSk7Cgp2YXJfZHVtcCgkbmV3QXJyYXkpOw==