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Web-PHP

PHP / array_combine — DevDocs

array_combine

(PHP 5, PHP 7, PHP 8)

array_combine — Creates an array by using one array for keys and another for its values

Description

array_combine(array $keys, array $values): array

Creates an array by using the values from the keys array as keys and the values from the values array as the corresponding values.

Parameters

keys: Array of keys to be used. Illegal values for key will be converted to string .
values: Array of values to be used

Return Values

Returns the combined array .

Errors/Exceptions

As of PHP 8.0.0, a ValueError is thrown if the number of elements in keys and values does not match. Prior to PHP 8.0.0, a E_WARNING was emitted instead.

Changelog

Version	Description
8.0.0	array_combine() will now throw a ValueError if the number of elements for each array is not equal; previously this function returned `false` instead.

Examples

Example #1 A simple array_combine() example

<?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);

print_r($c);
?>

The above example will output:

Array
(
    [green]  => avocado
    [red]    => apple
    [yellow] => banana
)

PHP / array_count_values — DevDocs

array_count_values

(PHP 4, PHP 5, PHP 7, PHP 8)

array_count_values — Counts all the values of an array

Description

array_count_values(array $array): array

array_count_values() returns an array using the values of array (which must be int s or string s) as keys and their frequency in array as values.

Parameters

array: The array of values to count

Return Values

Returns an associative array of values from array as keys and their count as value.

Errors/Exceptions

Throws E_WARNING for every element which is not string or int .

Examples

Example #1 array_count_values() example

<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

The above example will output:

Array
(
    [1] => 2
    [hello] => 2
    [world] => 1
)

PHP / array_diff — DevDocs

array_diff

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

array_diff — Computes the difference of arrays

Description

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

Compares array against one or more other arrays and returns the values in array that are not present in any of the other arrays.

Parameters

array: The array to compare from
arrays: Arrays to compare against

Return Values

Returns an array containing all the entries from array that are not present in any of the other arrays. Keys in the array array are preserved.

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_diff() example

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

print_r($result);
?>

Multiple occurrences in $array1 are all treated the same way. This will output :

Array
(
    [1] => blue
)

Example #2 array_diff() example with non-matching types

Two elements are considered equal if and only if (string) $elem1 === (string) $elem2 . That is, when the string representation is the same.

<?php
// This will generate a Notice that an array cannot be cast to a string.
$source = [1, 2, 3, 4];
$filter = [3, 4, [5], 6];
$result = array_diff($source, $filter);

// Whereas this is fine, since the objects can cast to a string.
class S {
  private $v;

  public function __construct(string $v) {
    $this->v = $v;
  }

  public function __toString() {
    return $this->v;
  }
}

$source = [new S('a'), new S('b'), new S('c')];
$filter = [new S('b'), new S('c'), new S('d')];

$result = array_diff($source, $filter);

// $result now contains one instance of S('a');
?>

To use an alternate comparison function, see array_udiff() .

Notes

Note :

This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff($array1[0], $array2[0]); .

PHP / array_diff_assoc — DevDocs

array_diff_assoc

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

array_diff_assoc — Computes the difference of arrays with additional index check

Description

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

Compares array against arrays and returns the difference. Unlike array_diff() the array keys are also used in the comparison.

Parameters

array: The array to compare from
arrays: Arrays to compare against

Return Values

Returns an array containing all the values from array that are not present in any of the other arrays.

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_diff_assoc() example

In this example you see the "a" => "green" pair is present in both arrays and thus it is not in the output from the function. Unlike this, the pair 0 => "red" is in the output because in the second argument "red" has key which is 1 .

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

The above example will output:

Array
(
    [b] => brown
    [c] => blue
    [0] => red
)

Example #2 array_diff_assoc() example

Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check takes place so the string representations must be the same.

<?php
$array1 = array(0, 1, 2);
$array2 = array("00", "01", "2");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>

The above example will output:

Array
(
    [0] => 0
    [1] => 1
)

Notes

Note : This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_diff_assoc($array1[0], $array2[0]); .

Note : Ensure you pass arguments in the correct order when comparing similar arrays with more keys. The new array should be the first in the list.

PHP / array_diff_key — DevDocs

array_diff_key

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

array_diff_key — Computes the difference of arrays using keys for comparison

Description

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

Compares the keys from array against the keys from arrays and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.

Parameters

array: The array to compare from
arrays: Arrays to compare against

Return Values

Returns an array containing all the entries from array whose keys are absent from all of the other arrays.

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_diff_key() example

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.

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

var_dump(array_diff_key($array1, $array2));
?>

The above example will output:

array(3) {
  ["blue"]=>
  int(1)
  ["red"]=>
  int(2)
  ["purple"]=>
  int(4)
}

<?php
$array1 = array('blue' => 1, 'red'  => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'yellow' => 7, 'cyan' => 8);
$array3 = array('blue' => 6, 'yellow' => 7, 'mauve' => 8);

var_dump(array_diff_key($array1, $array2, $array3));
?>

The above example will output:

array(2) {
  ["red"]=>
  int(2)
  ["purple"]=>
  int(4)
}

Notes

Note :

This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_key($array1[0], $array2[0]); .

PHP / array_diff_uassoc — DevDocs

array_diff_uassoc

(PHP 5, PHP 7, PHP 8)

array_diff_uassoc — Computes the difference of arrays with additional index check which is performed by a user supplied callback function

Description

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

Compares array against arrays and returns the difference. Unlike array_diff() the array keys are used in the comparison.

Unlike array_diff_assoc() a user supplied callback function is used for the indices comparison, not internal function.

Parameters

array

The array to compare from

arrays

Arrays to compare 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 an array containing all the entries from array that are not present in any of the other arrays.

Examples

Example #1 array_diff_uassoc() example

The "a" => "green" pair is present in both arrays and thus it is not in the output from the function. Unlike this, the pair 0 => "red" is in the output because in the second argument "red" has key which is 1 .

<?php
function key_compare_func($a, $b)
{
    if ($a === $b) {
        return 0;
    }
    return ($a > $b)? 1:-1;
}

$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_uassoc($array1, $array2, "key_compare_func");
print_r($result);
?>

The above example will output:

Array
(
    [b] => brown
    [c] => blue
    [0] => red
)

The equality of 2 indices is checked by the user supplied callback function.

Notes

Note :

This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_diff_uassoc($array1[0], $array2[0], "key_compare_func"); .

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Web-PHP

PHP / array_combine — DevDocs

array_combine

Description

Parameters

Return Values

Errors/Exceptions

Changelog

Examples

See Also

PHP / array_count_values — DevDocs

array_count_values

Description

Parameters

Return Values

Errors/Exceptions

Examples

See Also

PHP / array_diff — DevDocs

array_diff

Description

Parameters

Return Values

Changelog

Examples

Notes

See Also

PHP / array_diff_assoc — DevDocs

array_diff_assoc

Description

Parameters

Return Values

Changelog

Examples

Notes

See Also

PHP / array_diff_key — DevDocs

array_diff_key

Description

Parameters

Return Values

Changelog

Examples

Notes

See Also

PHP / array_diff_uassoc — DevDocs

array_diff_uassoc

Description

Parameters

Return Values

Examples

Notes

See Also