PHP str_replace数组

Question

i had a problem about returning an array into a spesified string. so, this is my code that i had been try.

$setValues = array("test1", "test2", "testurl");
$change = join("','", $setValues);    
$done = str_replace("", "?", $change);

so, the $change variable will return an array something like this :

'test1', 'test2', 'testurl'

i want to change that array into something like this :

?, ?, ?

is it possible to doing this?

Answer 1

use array_map() with callback

    $setValues = array("test1", "test2", "testurl");
    $change = array_map(function($val) { return "?"; }, $setValues);
    $change = join(",", $change); 
    echo $change;// outputs => ?,?,?

Answer 2

This will work for you-

function myfunction($num)
{
   return '?';
}

$setValues = array("test1", "test2", "testurl");
$setValues = array_map("myfunction",$setValues);
$change = join("','", $setValues);    
$done = str_replace("", "?", $change);

Answer 3

Iterating with array_map seems way too overkill for this. You're basically trying to generate n questionmarks, given that n = count($array) . So why not just:

$questionmarks = join( "," , array_fill( 0, count( $array ), "?" ) );