Php Generate Key Value Array
There are three types of array in PHP. Numeric Arrays, Associative Arrays, and Multidimensional Arrays. An associative array is in the form of key-value pair, where the key is the index of the array and value is the element of the array. Here the key can be user-defined. Jul 16, 2011 Hi Lotte, you make an array filled with the numbers 1.12 and swap randomly pairs. I have chosen for generating the pairs to take the index i, but you could also generate 2 random numbers and swap those. How to get all the keys of an associative array in PHP. Topic: PHP / MySQL Prev Next Answer: Use the PHP arraykeys function. You can use the PHP arraykeys function to get all the keys out of an associative array. Let's try out an example to understand how this function works.
Nov 15, 2017 Arrays in PHP is a type of data structure that allows us to store multiple elements of similar data type under a single variable thereby saving us the effort of creating a different variable for every data. The arrays are helpful to create a list of elements of similar types, which can be accessed using their index or key.
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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.
There are three different kind of arrays and each array value is accessed using an ID c which is called array index.
Numeric array − An array with a numeric index. Values are stored and accessed in linear fashion.
Associative array − An array with strings as index. Quake 3 arena steam key generator. 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
In this example we create a two dimensional array to store marks of three students in three subjects −
This example is an associative array, you can create numeric array in the same fashion.
This will produce the following result −
(PHP 5 >= 5.2.0, PHP 7)
array_fill_keys — Fill an array with values, specifying keys
Description
$keys , mixed$value ) : array Fills an array with the value of the value parameter, using the values of the keys array as keys.
Parameters
keysArray of values that will be used as keys. Illegal values for key will be converted to string.
value/duke-nukem-forever-cd-key-generator.html. 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);
?>See Also
- array_fill() - Fill an array with values
- array_combine() - Creates an array by using one array for keys and another for its values
<?php
$a = array('1');
var_dump(array_fill_keys($a, 'test'));
?>
array(1) {
[1]=>
string(4) 'test'
}
now string key '1' become an integer value 1, be careful.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
)
)This function does the same as:
<?php
$array = array_combine($keys,array_fill(0,count($keys),$value));
?>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, $arr2);
returns:
abc => 452, def =>128Scratchy's version still doesn't work like the definition describes. Here's one that can take a mixed variable as the second parameter, defaulting to an empty string if it's not specified. Don't know if this is exactly how the function works in later versions but it's at least a lot closer.
function array_fill_keys($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] =>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 $arraydisplay;
}To remove arbitrary keys from an associative array:
<?php
function nuke_keys($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, $array));
?>
The above snippet will return:
Array
(
[blue] => 1
[green] => 3
)$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
)Generate Key Code
Create Key Value Array In Php
- Array Functions
- Deprecated