PHP में Array Keys Reset करना

PHP में array के keys को reset करके 0 से शुरू होने वाले numeric keys बनाना।

विधि 1: array_values() (सबसे सरल)

<?php
$arr = ['p' => 150, 'q' => 100, 'r' => 120, 's' => 110];

echo "Before:\n";
var_dump($arr);
/*
array(4) {
  ["p"]=> string(3) "150"
  ["q"]=> string(3) "100"
  ["r"]=> string(3) "120"
  ["s"]=> string(3) "110"
}
*/

$reset = array_values($arr);

echo "After:\n";
var_dump($reset);
/*
array(4) {
  [0]=> string(3) "150"
  [1]=> string(3) "100"
  [2]=> string(3) "120"
  [3]=> string(3) "110"
}
*/

विधि 2: array_merge() (Side Effect)

<?php
$arr = [5 => 'a', 8 => 'b', 10 => 'c'];

// array_merge with empty array re-indexes numeric keys
$reset = array_merge($arr);
// या
$reset = array_merge([], $arr);

var_dump($reset); // [0 => 'a', 1 => 'b', 2 => 'c']

विधि 3: Custom Start Index के साथ

<?php
$arr = ['a' => 150, 'b' => 100, 'c' => 120];

// Start from index 10
$reset = array_combine(range(10, 10 + count($arr) - 1), array_values($arr));
var_dump($reset); // [10 => 150, 11 => 100, 12 => 120]

// Start from 'x' (alphabetic)
$reset = array_combine(
    range('x', chr(ord('x') + count($arr) - 1)), 
    array_values($arr)
);
var_dump($reset); // ['x' => 150, 'y' => 100, 'z' => 120]

विधि 4: foreach Loop (Manual Control)

<?php
$arr = [8 => 'Ben', 4 => 'Kevin', 7 => 'Mark', 3 => 'Hanks'];
$reset = [];
$index = 0;

foreach ($arr as $value) {
    $reset[$index++] = $value;
}

var_dump($reset); // [0 => 'Ben', 1 => 'Kevin', 2 => 'Mark', 3 => 'Hanks']

Multidimensional Arrays के लिए

<?php
$multi = [
    ['id' => 5, 'name' => 'A'],
    ['id' => 2, 'name' => 'B'],
    ['id' => 8, 'name' => 'C']
];

// केवल outer keys reset
$reset = array_values($multi);

// Deep reset (सभी levels)
function deepArrayValues($array) {
    $result = array_values($array);
    foreach ($result as &$value) {
        if (is_array($value)) {
            $value = deepArrayValues($value);
        }
    }
    return $result;
}

कब उपयोग करें

Performance Note

<?php
$large = array_fill(0, 100000, 'test');
$large = array_combine(range(100000, 199999), $large); // Non-sequential keys

$start = microtime(true);
$reset = array_values($large);
echo "Time: " . (microtime(true) - $start) * 1000 . "ms"; // ~1-2ms