What is the array_fill_keys() function in PHP?
Overview
The array_fill_keys() method will fill the same value for all the indicated keys of an array. Say we have an array, ＄keys = (3,"pin","tin"), and we want to use its values as a key for another array ＄fill = []. We can simply fill the keys with a new value like this:
$fill = array_fill_keys($keys,"value")
The above operation will produce an output like this:
(
3=>"value",
"pin"=>"value",
"tin"=>"value"
)
Note: The
array_fill_keys()method in PHP has support for PHP version 5 and later.
Syntax
array_fill_keys($keys, $value)
Parameters
-
＄keys: This is an array of values that will serve as the keys to the supplied values. The illegal members of this array will be converted to a string. -
＄value: This is the value that will be used to fill the keys with another value. That is, each key in the array＄keywill be given this value.
Example
<?php//declare variables$keys1 = array(1,2,3);$keys2 = ["byte","size", "shots"];$keys3 = [3,"play", 5,"laugh"];//save output of operation in a value$output1 = array_fill_keys($keys1,"codes");$output2 = array_fill_keys($keys2,"Edpresso");$output3 = array_fill_keys($keys3,"life");//print all outcome from operationprint_r($output1);print_r($output2);print_r($output3);?>
Explanation
- Lines 3–5: We declare arrays which will be used as
＄keyvalues. - Line 8: We use
array_fill_keys()to fill the keys in＄key1withcodesas a value and push the outcome to the variable＄output1. - Line 9: We use
array_fill_keys()to fill the keys in＄key2withEdpressoas a value and save the outcome to the variable＄output2. - Line 10: We use
array_fill_keys()to fill the keys in＄key3withlifeas a value and store the outcome to the variable＄output3. - Lines 13–15: We display the output variables to show the return value of the
array_fill_keys()method used earlier in the code.