PYTHON array_intersect_key

is this article helpful?
|
Python replacement for PHP's array_intersect_key [ edit | history ]
def dict_intersect_keys(dict1, *dicts):
    '''
    returns an dict containing all the entries of dict1 which have keys that are present in all other dicts.

    :param dict1: dict with master keys to check
    :type dict1: dict
    :param \*dicts: dicts to compare keys against
    :type \*dicts: dict
    :return: dict containing all the entries of dict1 which have keys that are present in all other dicts
    :rtype: dict
    '''
    keys = dict1.viewkeys()
    for dict in dicts:
        keys &= dict.viewkeys()

    return {k: dict1[k] for k in keys}

PHP array_intersect_key

PHP original manual for array_intersect_key [ show | php.net ]

array_intersect_key

(PHP 5 >= 5.1.0)

array_intersect_keyComputes the intersection of arrays using keys for comparison

Description

array array_intersect_key ( array $array1 , array $array2 [, array $ ... ] )

array_intersect_key() returns an array containing all the values of array1 which have matching keys that are present in all the arguments.

Parameters

array1

The array with master keys to check.

array2

An array to compare keys against.

array

A variable list of arrays to compare.

Return Values

Returns an associative array containing all the values of array1 which have matching keys that are present in all arguments.

Examples

Example #1 array_intersect_key() example

<?php
$array1 
= array('blue'  => 1'red'  => 2'green'  => 3'purple' => 4);
$array2 = array('green' => 5'blue' => 6'yellow' => 7'cyan'   => 8);

var_dump(array_intersect_key($array1$array2));
?>

The above example will output:

array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
}

In our example you see that only the keys 'blue' and 'green' are present in both arrays and thus returned. Also notice that the values for the keys 'blue' and 'green' differ between the two arrays. A match still occurs because only the keys are checked. The values returned are those of array1 .

The two keys from the key => value pairs are considered equal only if (string) $key1 === (string) $key2 . In other words a strict type check is executed so the string representation must be the same.

See Also

  • array_diff() - Computes the difference of arrays
  • array_udiff() - Computes the difference of arrays by using a callback function for data comparison
  • array_diff_assoc() - Computes the difference of arrays with additional index check
  • array_diff_uassoc() - Computes the difference of arrays with additional index check which is performed by a user supplied callback function
  • array_udiff_assoc() - Computes the difference of arrays with additional index check, compares data by a callback function
  • array_udiff_uassoc() - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
  • array_diff_key() - Computes the difference of arrays using keys for comparison
  • array_diff_ukey() - Computes the difference of arrays using a callback function on the keys for comparison
  • array_intersect() - Computes the intersection of arrays
  • array_intersect_assoc() - Computes the intersection of arrays with additional index check
  • array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
  • array_intersect_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison