How to explode URL parameter list string into paired [key] => [value] Array? [duplicate]

问题

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Closed 7 years ago.

Possible Duplicate:
Parse query string into an array

How can I explode a string such as:

a=1&b=2&c=3

So that it becomes:

Array {
 [a] => 1
 [b] => 2
 [c] => 3
}

Using the regular explode() function delimited on the & will separate the parameters but not in [key] => [value] pairs.

Thanks.

回答1:

Use PHP's parse_str function.

$str = 'a=1&b=2&c=3';
$exploded = array();
parse_str($str, $exploded);
$exploded['a']; // 1

I wonder where you get this string from? If it's part of the URL after the question mark (the query string of an URL), you can already access it via the superglobal $_GET array:

# in script requested with http://example.com/script.php?a=1&b=2&c=3
$_GET['a']; // 1
var_dump($_GET); // array(3) { ['a'] => string(1) '1', ['b'] => string(1) '2', ['c'] => string(1) '3' )

回答2:

Try to use the parse_str() function:

$str = "first=value&arr[]=foo+bar&arr[]=baz";
parse_str($str, $output);
echo $output['first'];  // value
echo $output['arr'][0]; // foo bar
echo $output['arr'][1]; // baz

回答3:

Something like this will work

$str = "a=1&b=2&c=3"
$array = array();
$elems = explode("&", $str);
foreach($elems as $elem){
    $items = explode("=", $elem);
    $array[$items[0]] = $items[1];
}

来源：https://stackoverflow.com/questions/9046279/how-to-explode-url-parameter-list-string-into-paired-key-value-array