Php get values from array by keys

Question

❮ PHP Array Reference

Table of Contents Show

Definition and Usage
Parameter Values
Technical Details
More Examples
PHP: Return all the keys of an array
PHP: Tips of the Day
Description
Return Values
How get key from value in array in PHP?
How can we get particular data from array in PHP?
What is array_keys () used for?
What is $Key in PHP?

Example

Return an array containing the keys:

<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");
print_r(array_keys($a));
?>

Try it Yourself »

Definition and Usage

The array_keys() function returns an array containing the keys.

Syntax

array_keys(array, value, strict)

Parameter Values

Parameter	Description
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. Not depending on type, the number 5 is the same as the string "5".

Technical Details

Return Value:	Returns an array containing the keys
PHP Version:	4+
Changelog:	The strict parameter was added in PHP 5.0

More Examples

Example

Using the value parameter:

<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");
print_r(array_keys($a,"Highlander"));
?>

Try it Yourself »

Example

Using the strict parameter, false:

<?php
$a=array(10,20,30,"10");
print_r(array_keys($a,"10",false));
?>

Try it Yourself »

Example

Using the strict parameter, true:

<?php
$a=array(10,20,30,"10");
print_r(array_keys($a,"10",true));
?>

Try it Yourself »

❮ PHP Array Reference

Last update on August 19 2022 21:50:39 (UTC/GMT +8 hours)

PHP: Return all the keys of an array

The array_keys() function is used to get all the keys or a subset of the keys of an array.

Version:

(PHP 4 and above)

Syntax:

array_keys(input_array, search_key_value, strict)

Note: If the optional search_key_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned.

Parameters:

Name	Description	Required / Optional	Type
input_array	Specified array.	Required	Array
search_key_value	Value to be checked.	Optional	Array
strict	As of PHP 5, this parameter determines if strict comparison (===) should be used during the search.	Optional	Boolean

Return value:

An array of all the keys of input_arrray.

Value Type: Array

Example - 1:

<?php
$array1=array("Orange" => 100, "Apple" => 200, "Banana" => 300, "Cherry" => 400);
print_r(array_keys($array1));
?>

Output:

Array ( [0] => Orange [1] => Apple [2] => Banana [3] => Cherry )

Pictorial Presentation:

View the example in the browser

Example - 2 :

<?php
$array1=array("Orange","Apple","Banana","Apple");
print_r(array_keys($array1,"Apple"));
?>

Output :

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

View the example in the browser

Practice here online :

See also

PHP Function Reference

Previous:array_key_exists
Next: array_map

PHP: Tips of the Day

PHP: Javascript Equivalent to PHP Explode()

This is a direct conversion from your PHP code:

//Loading the variable
var mystr = '0000000020C90037:TEMP:data';

//Splitting it with : as the separator
var myarr = mystr.split(":");

//Then read the values from the array where 0 is the first
//Since we skipped the first element in the array, we start at 1
var myvar = myarr[1] + ":" + myarr[2];

// Show the resulting value
console.log(myvar);
// 'TEMP:data'

Ref : https://bit.ly/3hSDp4q

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

array_fill_keys — Fill an array with values, specifying keys

Description

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

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

Return Values

Returns the filled array

Examples

Example #1 array_fill_keys() example

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

The above example will output:

Array
(
    [foo] => banana
    [5] => banana
    [10] => banana
    [bar] => banana
)

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 ) )

ray.paseur sometimes uses gmail ¶

5 months ago

Get an associative array of zeros for counting letter frequency

<?php $ltrs = array_fill_keys( range('a', 'z'), 0 );

Scratchy ¶

14 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

manavchugh988 at gmail dot com ¶

3 months ago

see array_fill_keys are basically used to make a new array from a pre-existing array in a form that the value of the pre-existing array will now be the key of the new Array .And there value will be same That we had given in the 2nd parameter . Example Below---->>>

<?php //pre existing array $a = array("a","b","c","d","e");//new array with a single same value $newArray = array_fill_keys($a, "Testing");//printing the array echo "<pre>"; print_r($newArray); echo "</pre>"; ?> output; Array ( [a] => Testing [b] => Testing [c] => Testing [d] => Testing [e] => Testing )

bananasims at hotmail dot com ¶

15 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; }

matrebatre ¶

14 years ago

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

phydeaux ¶

14 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] =>

ntd at entidi dot it ¶

6 years ago

To remove arbitrary keys from an associative array:

<?phpfunction 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 ¶

8 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 )

How get key from value in array in PHP?

PHP: array_keys() function The array_keys() function is used to get all the keys or a subset of the keys of an array. Note: If the optional search_key_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned. Specified array.

How can we get particular data from array in PHP?

Answer: Use the Array Key or Index If you want to access an individual value form an indexed, associative or multidimensional array you can either do it through using the array index or key.

What is array_keys () used for?

The array_keys() is a built-in function in PHP and is used to return either all the keys of and array or the subset of the keys. Parameters: The function takes three parameters out of which one is mandatory and other two are optional.

What is $Key in PHP?

Return Values ¶ The key() function simply returns the key of the array element that's currently being pointed to by the internal pointer. It does not move the pointer in any way. If the internal pointer points beyond the end of the elements list or the array is empty, key() returns null .

kode php Search in array Array push PHP Undefined array key