<?php

// aftab
echo "===== aftab =====\n";
$old = array ();

$t = array();
$t[] = 'Autos-Vehicles';
$t['channel_name'] = 'Autos-Vehicles';
$old[]=$t;

$t = array();
$t[] = 'Bollywood';
$t['channel_name'] = 'Bollywood';
$old[]=$t;

$t = array();
$t[] = 'Cartoons';
$t['channel_name'] = 'Cartoons';
$old[]=$t;

print_r($old);

// rycar
echo "===== rycar =====\n";

$a = array();
foreach ($old as $row)  {
                                        $a[$row[0]] = $row['channel_name'] ;
                                }
print_r($a);

// Cursarion
echo "===== Cursarion =====\n";

$new_array = array();
foreach($old as $key => $value)         {
                                                        $new_array[$key] = $value[0];
                                                }
print_r($new_array);






// OUTPUT

===== aftab =====
Array
(
    [0] => Array
        (
            [0] => Autos-Vehicles
            [channel_name] => Autos-Vehicles
        )

    [1] => Array
        (
            [0] => Bollywood
            [channel_name] => Bollywood
        )

    [2] => Array
        (
            [0] => Cartoons
            [channel_name] => Cartoons
        )

)
===== rycar =====
Array
(
    [Autos-Vehicles] => Autos-Vehicles
    [Bollywood] => Bollywood
    [Cartoons] => Cartoons
)
===== Cursarion =====
Array
(
    [0] => Autos-Vehicles
    [1] => Bollywood
    [2] => Cartoons
)