(PHP 5 >= 5.2.0, PHP 7, PHP 8)
array_fill_keys —Fill an array with values, specifying keys
Fills an array with the value of thevalue parameter, using the values of thekeys array as keys.
keysArray of values that will be used as keys. Illegal values for key will be converted tostring.
valueValue to use for filling
Returns the filled array
Example #1array_fill_keys() example
<?php
$keys= array('foo',5,10,'bar');
$a=array_fill_keys($keys,'banana');
print_r($a);
?>The above example will output:
Array( [foo] => banana [5] => banana [10] => banana [bar] => banana)
<?php$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,$array2));?>The output will beArray( [first] => Array( [a] => first, [b] => something, [0] => letsc ), [second] => Array( [a] => first, [b] => something, [0] => letsc ), [something] => Array( [a] => first, [b] => something, [0] => letsc ), [red] => Array( [a] => first, [b] => something, [0] => letsc ))Get an associative array of zeros for counting letter frequency<?php$ltrs=array_fill_keys(range('a','z'),0);RE: bananasims at hotmail dot comI 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, $arr2);returns:abc => 452, def =>128Some of the versions do not have this function.I try to write it myself.You may refer to my script belowfunction array_fill_keys($array, $values) { if(is_array($array)) { foreach($array as $key => $value) { $arraydisplay[$array[$key]] = $values; } } return $arraydisplay;}see array_fill_keys are basically used to make a new array from a pre-existing array in a form that the value of the pre-existing array will now be the key of the new Array .And there value will be same That we had given in the 2nd parameter . Example Below---->>><?php//pre existing array$a= array("a","b","c","d","e");//new array with a single same value$newArray=array_fill_keys($a,"Testing");//printing the arrayecho"<pre>";print_r($newArray); echo"</pre>";?>output; Array( [a] => Testing [b] => Testing [c] => Testing [d] => Testing [e] => Testing)