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PHP / array_intersect — DevDocs

array_intersect

(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)

array_intersect Computes the intersection of arrays

Description

array_intersect(array $array, array ...$arrays): array

array_intersect() returns an array containing all the values of array that are present in all the arguments. Note that keys are preserved.

Parameters

array

The array with master values to check.

arrays

Arrays to compare values against.

Return Values

Returns an array containing all of the values in array whose values exist in all of the parameters.

Changelog

Version Description
8.0.0 This function can now be called with only one parameter. Formerly, at least two parameters have been required.

Examples

Example #1 array_intersect() example

<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
print_r($result);
?>

The above example will output:

Array
(
    [a] => green
    [0] => red
)

Notes

Note : Two elements are considered equal if and only if (string) $elem1 === (string) $elem2 . In words: when the string representation is the same.

See Also

  • array_intersect_assoc() - Computes the intersection of arrays with additional index check
  • array_diff() - Computes the difference of arrays
  • array_diff_assoc() - Computes the difference of arrays with additional index check
PHP / array_intersect_assoc — DevDocs

array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)

array_intersect_assoc Computes the intersection of arrays with additional index check

Description

array_intersect_assoc(array $array, array ...$arrays): array

array_intersect_assoc() returns an array containing all the values of array that are present in all the arguments. Note that the keys are also used in the comparison unlike in array_intersect() .

Parameters

array

The array with master values to check.

arrays

Arrays to compare values against.

Return Values

Returns an associative array containing all the values in array that are present in all of the arguments.

Changelog

Version Description
8.0.0 This function can now be called with only one parameter. Formerly, at least two parameters have been required.

Examples

Example #1 array_intersect_assoc() example

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "b" => "yellow", "blue", "red");
$result_array = array_intersect_assoc($array1, $array2);
print_r($result_array);
?>

The above example will output:

Array
(
    [a] => green
)

In our example you see that only the pair "a" => "green" is present in both arrays and thus is returned. The value "red" is not returned because in $array1 its key is 0 while the key of "red" in $array2 is 1 , and the key "b" is not returned because its values are different in each array.

The two values from the key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict type check is executed so the string representation must be the same.

See Also

  • array_intersect() - Computes the intersection of arrays
  • array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
  • array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
  • array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by separate callback functions
  • array_diff() - Computes the difference of arrays
  • array_diff_assoc() - Computes the difference of arrays with additional index check
Read article
PHP / array_intersect_key — DevDocs

array_intersect_key

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

array_intersect_key Computes the intersection of arrays using keys for comparison

Description

array_intersect_key(array $array, array ...$arrays): array

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

Parameters

array

The array with master keys to check.

arrays

Arrays to compare keys against.

Return Values

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

Changelog

Version Description
8.0.0 This function can now be called with only one parameter. Formerly, at least two parameters have been required.

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 array .

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
Read article
PHP / array_intersect_uassoc — DevDocs

array_intersect_uassoc

(PHP 5, PHP 7, PHP 8)

array_intersect_uassoc Computes the intersection of arrays with additional index check, compares indexes by a callback function

Description

array_intersect_uassoc(array $array, array ...$arrays, callable $key_compare_func): array

array_intersect_uassoc() returns an array containing all the values of array that are present in all the arguments. Note that the keys are used in the comparison unlike in array_intersect() .

Parameters

array

Initial array for comparison of the arrays.

arrays

Arrays to compare keys against.

key_compare_func

The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

callback(mixed $a, mixed $b): int

Return Values

Returns the values of array whose values exist in all of the arguments.

Examples

Example #1 array_intersect_uassoc() example

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");

print_r(array_intersect_uassoc($array1, $array2, "strcasecmp"));
?>

The above example will output:

Array
(
    [b] => brown
)

See Also

  • array_intersect() - Computes the intersection of arrays
  • array_intersect_assoc() - Computes the intersection of arrays with additional index check
  • array_uintersect_assoc() - Computes the intersection of arrays with additional index check, compares data by a callback function
  • array_uintersect_uassoc() - Computes the intersection of arrays with additional index check, compares data and indexes by separate callback functions
  • array_intersect_key() - Computes the intersection of arrays using keys for comparison
  • array_intersect_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison
Read article
PHP / array_intersect_ukey — DevDocs

array_intersect_ukey

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

array_intersect_ukey Computes the intersection of arrays using a callback function on the keys for comparison

Description

array_intersect_ukey(array $array, array ...$arrays, callable $key_compare_func): array

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

Parameters

array

Initial array for comparison of the arrays.

arrays

Arrays to compare keys against.

key_compare_func

The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

callback(mixed $a, mixed $b): int

Return Values

Returns the values of array whose keys exist in all the arguments.

Examples

Example #1 array_intersect_ukey() example

<?php
function key_compare_func($key1, $key2)
{
    if ($key1 == $key2)
        return 0;
    else if ($key1 > $key2)
        return 1;
    else
        return -1;
}

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

var_dump(array_intersect_ukey($array1, $array2, 'key_compare_func'));
?>

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 array .

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_key() - Computes the intersection of arrays using keys for comparison
Read article
PHP / array_is_list — DevDocs

array_is_list

(PHP 8 >= 8.1.0)

array_is_list Checks whether a given array is a list

Description

array_is_list(array $array): bool

Determines if the given array is a list. An array is considered a list if its keys consist of consecutive numbers from 0 to count($array)-1 .

Parameters

array

The array being evaluated.

Return Values

Returns true if array is a list, false otherwise.

Examples

Example #1 array_is_list() example

<?php

array_is_list([]); // true
array_is_list(['apple', 2, 3]); // true
array_is_list([0 => 'apple', 'orange']); // true

// The array does not start at 0
array_is_list([1 => 'apple', 'orange']); // false

// The keys are not in the correct order
array_is_list([1 => 'apple', 0 => 'orange']); // false

// Non-integer keys
array_is_list([0 => 'apple', 'foo' => 'bar']); // false

// Non-consecutive keys
array_is_list([0 => 'apple', 2 => 'bar']); // false
?>

Notes

Note :

This function returns true on empty arrays.

See Also

  • array_values() - Return all the values of an array
Read article

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