Prefixing array keys with a string (:) in PHP

Question

Quick one; I know a solution, but I\'m looking for something more elegant if it exists.

I\'m using PDO for prepeared statements:

$sql = \"INSERT INTO         


        

Answer 1

$source->execute($sql, array(
    'foo' => $foo,
    'bar' => $bar,
    'baz' => $baz
));

This is presuming the above calls PDOStatement::execute() under the hood, with the above array as its argument.¹

:)

---

^{1) Tested with version 5.2.17 and 5.3.8 here, and working as expected.}

Answer 2

One liner...

$array = array('test'=>'55','yest'=>'66');

$array = array_flip(array_map(function($v){return ':' . $v;},array_flip($array)));

// array(':test'=>'55',':yest'=>'66');

However this isn't safe as array_flip relies on all values being unique.

So one of the looping solutions is probably the best, or alternatively array_keys with array_combine.

Answer 3

use the php map-function: http://php.net/manual/en/function.array-map.php

function reduce($key)
{
if(strpos($key,":")===0)
return substr($key,1);
return $key;
}

$array = array_map("reduce",$array);

Answer 4

It has already been answered but this is what I came up with anyway.

$arr = array('foo'=>1,'bar'=>2);

$arr = array_flip($arr);

array_walk($arr,create_function('&$v,$k', '$v = ":$v";'));

$arr = array_flip($arr);

print_r($arr);