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Web-PHP

PHP / array_column — DevDocs

array_column

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

array_column — Return the values from a single column in the input array

Description

array_column(array $array, int|string|null $column_key, int|string|null $index_key = null): array

array_column() returns the values from a single column of the array , identified by the column_key . Optionally, an index_key may be provided to index the values in the returned array by the values from the index_key column of the input array.

Parameters

array: A multi-dimensional array or an array of objects from which to pull a column of values from. If an array of objects is provided, then public properties can be directly pulled. In order for protected or private properties to be pulled, the class must implement both the __get() and __isset() magic methods.
column_key: The column of values to return. This value may be an integer key of the column you wish to retrieve, or it may be a string key name for an associative array or property name. It may also be null to return complete arrays or objects (this is useful together with index_key to reindex the array).
index_key: The column to use as the index/keys for the returned array. This value may be the integer key of the column, or it may be the string key name. The value is cast as usual for array keys (however, prior to PHP 8.0.0, objects supporting conversion to string were also allowed).

Return Values

Returns an array of values representing a single column from the input array.

Changelog

Version	Description
8.0.0	Objects in columns indicated by `index_key` parameter will no longer be cast to string and will now throw a TypeError instead.

Examples

Example #1 Get the column of first names from a recordset

<?php
// Array representing a possible record set returned from a database
$records = array(
    array(
        'id' => 2135,
        'first_name' => 'John',
        'last_name' => 'Doe',
    ),
    array(
        'id' => 3245,
        'first_name' => 'Sally',
        'last_name' => 'Smith',
    ),
    array(
        'id' => 5342,
        'first_name' => 'Jane',
        'last_name' => 'Jones',
    ),
    array(
        'id' => 5623,
        'first_name' => 'Peter',
        'last_name' => 'Doe',
    )
);
 
$first_names = array_column($records, 'first_name');
print_r($first_names);
?>

The above example will output:

Array
(
    [0] => John
    [1] => Sally
    [2] => Jane
    [3] => Peter
)

Example #2 Get the column of last names from a recordset, indexed by the "id" column

<?php
// Using the $records array from Example #1
$last_names = array_column($records, 'last_name', 'id');
print_r($last_names);
?>

The above example will output:

Array
(
    [2135] => Doe
    [3245] => Smith
    [5342] => Jones
    [5623] => Doe
)

Example #3 Get the column of usernames from the public "username" property of an object

<?php

class User
{
    public $username;

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

$users = [
    new User('user 1'),
    new User('user 2'),
    new User('user 3'),
];

print_r(array_column($users, 'username'));
?>

The above example will output:

Array
(
    [0] => user 1
    [1] => user 2
    [2] => user 3
)

Example #4 Get the column of names from the private "name" property of an object using the magic __get() method.

<?php

class Person
{
    private $name;

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

    public function __get($prop)
    {
        return $this->$prop;
    }

    public function __isset($prop) : bool
    {
        return isset($this->$prop);
    }
}

$people = [
    new Person('Fred'),
    new Person('Jane'),
    new Person('John'),
];

print_r(array_column($people, 'name'));
?>

The above example will output:

Array
(
    [0] => Fred
    [1] => Jane
    [2] => John
)

If __isset() is not provided, then an empty array will be returned.

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]); .

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Web-PHP

PHP / array_column — DevDocs

array_column

Description

Parameters

Return Values

Changelog

Examples

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