Php Generate Key Value Array

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PHP offers us a special type of array called an Associative Array that allows us to create an array with Key-Value pairs. Generate link and share the link here.

(PHP 5 >= 5.2.0, PHP 7)

array_fill_keys — Fill an array with values, specifying keys

Array: Required. Specifies an array: value: Optional. You can specify a value, then only the keys with this value are returned: strict: Optional. Used with the value parameter. Possible values: true - Returns the keys with the specified value, depending on type: the number 5 is not the same as the string '5'. False - Default value.
Nov 21, 2019 php search multidimensional array by key and value. Here we will learn how to search in the multidimensional array for value and return key. Also learn how to search multidimensional array for key and return value. Sometimes we need to search in an array or multidimensional array by key or value without using any function.

Description

array_fill_keys ( array$keys , mixed$value ) : array

Fills an array with the value of the value parameter, using the values of the keys array as keys.

Parameters

keys

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

value

Value to use for filling

Examples

Example #1 array_fill_keys() example

<?php
$keys = array('foo', 5, 10, 'bar');
$a = array_fill_keys($keys, 'banana');
print_r($a);
?>

If an associative array is used as the second parameter of array_fill_keys, then the associative array will be appended in all the values of the first array. 
e.g. 
<?php 
$array1 = array( 
'a' => 'first', 
'b' => 'second', 
'c' => 'something', 
'red' 
); 
$array2 = array( 
'a' => 'first', 
'b' => 'something', 
'letsc' 
); 
print_r(array_fill_keys($array1, $array2)); 
?> 

The output will be 
Array( 
 [first] => Array( 
 [a] => first, 
 [b] => something, 
 [0] => letsc 
 ), 
 [second] => Array( 
 [a] => first, 
 [b] => something, 
 [0] => letsc 
 ), 
 [something] => Array( 
 [a] => first, 
 [b] => something, 
 [0] => letsc 
 ), 
 [red] => Array( 
 [a] => first, 
 [b] => something, 
 [0] => letsc 
 ) 
)

matrebatre ¶

11 years ago

This function does the same as:
<?php
$array = array_combine($keys,array_fill(0,count($keys),$value));
?>

Scratchy ¶

11 years ago

RE: bananasims at hotmail dot com
I also needed a work around to not having a new version of PHP and wanting my own keys. bananasims code doesn't like having an array as the second parameter..
Here's a slightly modified version than can handle 2 arrays as inputs:
//we want these values to be keys
$arr1 = (0 => 'abc', 1 => 'def');
/we want these values to be values
$arr2 = (0 => 452, 1 => 128);
function array_fill_keys($keyArray, $valueArray) {
 if(is_array($keyArray)) {
 foreach($keyArray as $key => $value) {
 $filledArray[$value] = $valueArray[$key];
 }
 }
 return $filledArray;
}
array_fill_keys($arr1, $arr2);
returns:
abc => 452, def =>128

phydeaux ¶

11 years ago

Scratchy's version still doesn't work like the definition describes. Here's one that can take a mixed variable as the second parameter, defaulting to an empty string if it's not specified. Don't know if this is exactly how the function works in later versions but it's at least a lot closer.
function array_fill_keys($target, $value = ') {
 if(is_array($target)) {
 foreach($target as $key => $val) {
 $filledArray[$val] = is_array($value) ? $value[$key] : $value;
 }
 }
 return $filledArray;
}
This works for either strings or numerics, so if we have
$arr1 = array(0 => 'abc', 1 => 'def');
$arr2 = array(0 => 452, 1 => 128);
$arr3 = array(0 => 'foo', 1 => 'bar');
then
array_fill_keys($arr1,$arr2)
returns: [abc] => 452, [def] => 128
array_fill_keys($arr1,0)
returns: [abc] => 0, [def] => 0
array_fill_keys($arr2,$arr3)
returns: [452] => foo, [128] => bar
array_fill_keys($arr3,'BLAH')
returns: [foo] => BLAH, [bar] => BLAH
and array_fill_keys($arr1)
returns: [abc] =>, [def] =>

bananasims at hotmail dot com ¶

13 years ago

Some of the versions do not have this function.
I try to write it myself.
You may refer to my script below
function array_fill_keys($array, $values) {
 if(is_array($array)) {
 foreach($array as $key => $value) {
 $arraydisplay[$array[$key]] = $values;
 }
 }
 return $arraydisplay;
}

ntd at entidi dot it ¶

4 years ago

To remove arbitrary keys from an associative array:
<?php
function nuke_keys($keys, $array) {
 return array_diff_key($array, array_fill_keys($keys, 0));
}
$array = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$keys = array('red', 'purple');
print_r(nuke_keys($keys, $array));
?>

The above snippet will return:
Array
(
 [blue] => 1
 [green] => 3
)

taylanaktepe at yahoo dot com ¶

5 years ago

$keys = array(1, 2, 3);
// Fill it with value.
$keys = array_fill_keys($keys, 'banana');
print_r($keys); 
// Fill it different value.
$apples = array_fill_keys(array_keys($keys), 'apple');
print_r($apples); 
// Output:
Array ( 
 [1] => banana 
 [2] => banana 
 [3] => banana 
)
Array ( 
 [1] => apple 
 [2] => apple 
 [3] => apple
)

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An array is a data structure that stores one or more similar type of values in a single value. For example if you want to store 100 numbers then instead of defining 100 variables its easy to define an array of 100 length.

Php Create Key Value Array

There are three different kind of arrays and each array value is accessed using an ID c which is called array index. Office 2011 mac serial key generator.

Php Array Push Key Value

Numeric array − An array with a numeric index. Values are stored and accessed in linear fashion.
Associative array − An array with strings as index. This stores element values in association with key values rather than in a strict linear index order.
Multidimensional array − An array containing one or more arrays and values are accessed using multiple indices

NOTE − Built-in array functions is given in function reference PHP Array Functions

Numeric Array

These arrays can store numbers, strings and any object but their index will be represented by numbers. By default array index starts from zero.

Example

Following is the example showing how to create and access numeric arrays.

Here we have used array() function to create array. This function is explained in function reference.

This will produce the following result −

Associative Arrays

The associative arrays are very similar to numeric arrays in term of functionality but they are different in terms of their index. Associative array will have their index as string so that you can establish a strong association between key and values.

To store the salaries of employees in an array, a numerically indexed array would not be the best choice. Instead, we could use the employees names as the keys in our associative array, and the value would be their respective salary.

NOTE − Don't keep associative array inside double quote while printing otherwise it would not return any value.

Example

This will produce the following result −

Multidimensional Arrays

A multi-dimensional array each element in the main array can also be an array. And each element in the sub-array can be an array, and so on. Values in the multi-dimensional array are accessed using multiple index.

Example