Php drop array keys

PHP Array Remove Keys and Keep Values Example

In this small post, i want to show you how to remove keys and keep values in php array basically how to reindex array start from 0 index in php. we can make it done using array_values function of php array.

array_values() will re-create array with new keys so basically array_values function will create new array with new key like default 0 1 2 etc. if you want to delete keys and keep values with new array then in php.

See bellow simple example with output so, it will help you to make better sanes.

$myArray = [

‘paresh’ => ‘Paresh’,

‘hardik’ => ‘Hardik’,

‘vimal’ => ‘Vimal’,

‘harshad’ => ‘Harshad’

];

$reCreateArray = array_values($myArray);

print_r($reCreateArray);

Array

(

[0] => Paresh [1] => Hardik [2] => Vimal [3] => Harshad

)

Hardik Savani

I’m a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Laravel, Angular, Vue, Node, Javascript, JQuery, Codeigniter and Bootstrap from the early stage. I believe in Hardworking and Consistency.

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Removing Keys from an Array in PHP

Removing one or more keys from an array in PHP seems like something that should be easy to do. Yet out of the 70+ array functions in PHP, there is no single function to do it. But here’s the easy way:

Use array_diff_key()

PHP has a function called array_diff_key($array1, $array2) that returns an array with all of the keys (and their values) from $array1 that don’t also occur in $array2. We can use this to quickly cobble together a solution:

 function array_remove_keys($array, $keys) { // array_diff_key() expected an associative array. $assocKeys = array(); foreach($keys as $key) { $assocKeys[$key] = true; } return array_diff_key($array, $assocKeys); } // Example: $data = array( 'name' => 'Brian', 'address1' => '98 Market St.', 'address2' => 'N/A' ); // Output before array_remove_keys() var_dump($data); // Remove address2 key. $data = array_remove_keys($data, array('address2')); // Output after array_remove_keys() var_dump($data); /* Output: array(3) < ["name"]=>string(5) "Brian" ["address1"]=> string(13) "98 Market St." ["address2"]=> string(3) "N/A" > array(2) < ["name"]=>string(5) "Brian" ["address1"]=> string(13) "98 Market St." > */

return array_diff_key($array, $assocKeys); > // Example: $data = array( ‘name’ => ‘Brian’, ‘address1′ => ’98 Market St.’, ‘address2’ => ‘N/A’ ); // Output before array_remove_keys() var_dump($data); // Remove address2 key. $data = array_remove_keys($data, array(‘address2’)); // Output after array_remove_keys() var_dump($data); /* Output: array(3) < ["name"]=>string(5) «Brian» [«address1»]=> string(13) «98 Market St.» [«address2»]=> string(3) «N/A» > array(2) < ["name"]=>string(5) «Brian» [«address1»]=> string(13) «98 Market St.» > */

Works great! But it’s not quite complete. There is absolutely no error checking, and passing an array as the second parameter isn’t the most convenient way to operate. Let’s give the caller the option of passing either an array, or a comma-separated list of keys to delete.

 function array_remove_keys($array, $keys = array())  // If array is empty or not an array at all, don't bother // doing anything else. if(empty($array)  // If $keys is a comma-separated list, convert to an array. if(is_string($keys)) { $keys = explode(',', $keys); } // At this point if $keys is not an array, we can't do anything with it. if(! is_array($keys)) { return $array; } // array_diff_key() expected an associative array. $assocKeys = array(); foreach($keys as $key) { $assocKeys[$key] = true; } return array_diff_key($array, $assocKeys); } // Example: $data = array( 'name' => 'Brian', 'address1' => '98 Market St.', 'address2' => 'N/A' ); // Output before array_remove_keys() var_dump($data); // Remove address2 key. $data = array_remove_keys($data, 'address2'); // Output after array_remove_keys() var_dump($data); /* Output: array(3) < ["name"]=>string(5) "Brian" ["address1"]=> string(13) "98 Market St." ["address2"]=> string(3) "N/A" > array(2) < ["name"]=>string(5) "Brian" ["address1"]=> string(13) "98 Market St." > */

// If $keys is a comma-separated list, convert to an array. if(is_string($keys)) < $keys = explode(',', $keys); >// At this point if $keys is not an array, we can’t do anything with it. if(! is_array($keys)) < return $array; >// array_diff_key() expected an associative array. $assocKeys = array(); foreach($keys as $key) < $assocKeys[$key] = true; >return array_diff_key($array, $assocKeys); > // Example: $data = array( ‘name’ => ‘Brian’, ‘address1′ => ’98 Market St.’, ‘address2’ => ‘N/A’ ); // Output before array_remove_keys() var_dump($data); // Remove address2 key. $data = array_remove_keys($data, ‘address2’); // Output after array_remove_keys() var_dump($data); /* Output: array(3) < ["name"]=>string(5) «Brian» [«address1»]=> string(13) «98 Market St.» [«address2»]=> string(3) «N/A» > array(2) < ["name"]=>string(5) «Brian» [«address1»]=> string(13) «98 Market St.» > */

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/wp-content/uploads/2019/09/reich-web-consulting-logo-o.svg 0 0 Brian Reich /wp-content/uploads/2019/09/reich-web-consulting-logo-o.svg Brian Reich 2010-12-15 14:03:52 2019-07-30 22:19:16 Removing Keys from an Array in PHP

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Remove keys from an associative array in PHP

Today we’ll write a short article on how to remove keys from an associative array in PHP and get an array without keys to return a new reindex array which starts with index 0.

Ways to remove keys from associative array

1. Using built-in function

We have built-in array_values() function to remove the keys and re-create the array with new keys starting from 0. It returns an indexed array of values.

It required only a single parameter that specifies the array. Refer to the following example.

2. Using custom function

We can also remove the keys and get an array values using foreach loop with custom function.

That’s it for today.
Thank you for reading. Happy Coding.

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