array_map and append string to elements of an array

php arrays array-map
hd. picture hd. · Jan 14, 2012 · Viewed 8.5k times · Source

I have an array like this:

$a = array('aa', 'bb', 'cc', 'dd');

I want to add the 'rq' string at the beginning of all the elements of the array. Is it possible to do it by calling array_map() on this array?

Answer

deceze picture deceze · Jan 14, 2012 
$a = array_map(function ($str) { return "rq$str"; }, $a);

Related questions

array_map not working in classes

I am trying to create a class to handle arrays but I can't seem to get array_map() to work in it. <?php //Create the test array $array = array(1,2,3,4,5,6,7,8,9,10); //create the test class class test { //variable to save array …

Read More
How can I use array_map with keys and values, but return an array with the same indexes (not int)?

I have an array such as ['id' => 1, 'name' => 'Fred']. I want to call array_map on this array and also use the key inside the function. However, when I make a return, my keys will become int. Simple …

Read More
PHP error. Why is "variable undefined" inside array_map?

I am using array_map function in my php application. I defined the array_map function like this. $ratingID = $this->db->insert_id(); $rated_item_array = array_map(function ($a) { return $a + array('RatingID' => $ratingID); }, $rated_item_…

Read More