Passing arrays as url parameter
PhpArraysUrlPhp Problem Overview
What is the best way that I can pass an array as a url parameter? I was thinking if this is possible:
$aValues = array();
$url = 'http://www.example.com?aParam='.$aValues;
or how about this:
$url = 'http://www.example.com?aParam[]='.$aValues;
Ive read examples, but I find it messy:
$url = 'http://www.example.com?aParam[]=value1&aParam[]=value2&aParam[]=value3';
Php Solutions
Solution 1 - Php
There is a very simple solution: http_build_query()
. It takes your query parameters as an associative array:
$data = array(
1,
4,
'a' => 'b',
'c' => 'd'
);
$query = http_build_query(array('aParam' => $data));
will return
string(63) "aParam%5B0%5D=1&aParam%5B1%5D=4&aParam%5Ba%5D=b&aParam%5Bc%5D=d"
http_build_query()
handles all the necessary escaping for you (%5B
=> [
and %5D
=> ]
), so this string is equal to aParam[0]=1&aParam[1]=4&aParam[a]=b&aParam[c]=d
.
Solution 2 - Php
Edit: Don't miss Stefan's solution above, which uses the very handy http_build_query()
function: https://stackoverflow.com/a/1764199/179125
knittl is right on about escaping. However, there's a simpler way to do this:
$url = 'http://example.com/index.php?';
$url .= 'aValues[]=' . implode('&aValues[]=', array_map('urlencode', $aValues));
If you want to do this with an associative array, try this instead:
PHP 5.3+ (lambda function)
$url = 'http://example.com/index.php?';
$url .= implode('&', array_map(function($key, $val) {
return 'aValues[' . urlencode($key) . ']=' . urlencode($val);
},
array_keys($aValues), $aValues)
);
PHP <5.3 (callback)
function urlify($key, $val) {
return 'aValues[' . urlencode($key) . ']=' . urlencode($val);
}
$url = 'http://example.com/index.php?';
$url .= implode('&', array_map('urlify', array_keys($aValues), $aValues));
Solution 3 - Php
Easiest way would be to use the serialize
function.
It serializes any variable for storage or transfer. You can read about it in the php manual - serialize
The variable can be restored by using unserialize
So in the passing to the URL you use:
$url = urlencode(serialize($array))
and to restore the variable you use
$var = unserialize(urldecode($_GET['array']))
Be careful here though. The maximum size of a GET request is limited to 4k, which you can easily exceed by passing arrays in a URL.
Also, its really not quite the safest way to pass data! You should probably look into using sessions instead.
Solution 4 - Php
please escape your variables when outputting (urlencode
).
and you can’t just print an array, you have to build your url using a loop in some way
$url = 'http://example.com/index.php?'
$first = true;
foreach($aValues as $key => $value) {
if(!$first) $url .= '&';
else $first = false;
$url .= 'aValues['.urlencode($key).']='.urlencode($value);
}
Solution 5 - Php
<?php
$array["a"] = "Thusitha";
$array["b"] = "Sumanadasa";
$array["c"] = "Lakmal";
$array["d"] = "Nanayakkara";
$str = serialize($array);
$strenc = urlencode($str);
print $str . "\n";
print $strenc . "\n";
?>
print $str . "\n";
gives a:4:{s:1:"a";s:8:"Thusitha";s:1:"b";s:10:"Sumanadasa";s:1:"c";s:6:"Lakmal";s:1:"d";s:11:"Nanayakkara";}
and
print $strenc . "\n";
gives
a%3A4%3A%7Bs%3A1%3A%22a%22%3Bs%3A8%3A%22Thusitha%22%3Bs%3A1%3A%22b%22%3Bs%3A10%3A%22Sumanadasa%22%3Bs%3A1%3A%22c%22%3Bs%3A6%3A%22Lakmal%22%3Bs%3A1%3A%22d%22%3Bs%3A11%3A%22Nanayakkara%22%3B%7D
So if you want to pass this $array
through URL to page_no_2.php
,
ex:-
$url ='http://page_no_2.php?data=".$strenc."';
To return back to the original array, it needs to be urldecode()
, then unserialize()
, like this in page_no_2.php:
<?php
$strenc2= $_GET['data'];
$arr = unserialize(urldecode($strenc2));
var_dump($arr);
?>
gives
array(4) {
["a"]=>
string(8) "Thusitha"
["b"]=>
string(10) "Sumanadasa"
["c"]=>
string(6) "Lakmal"
["d"]=>
string(11) "Nanayakkara"
}
again :D
Solution 6 - Php
I do this with serialized data base64 encoded. Best and smallest way, i guess. urlencode is to much wasting space and you have only 4k.
Solution 7 - Php
This isn't a direct answer as this has already been answered, but everyone was talking about sending the data, but nobody really said what you do when it gets there, and it took me a good half an hour to work it out. So I thought I would help out here.
I will repeat this bit
$data = array(
'cat' => 'moggy',
'dog' => 'mutt'
);
$query = http_build_query(array('mydata' => $data));
$query=urlencode($query);
Obviously you would format it better than this www.someurl.com?x=$query
And to get the data back
parse_str($_GET['x']);
echo $mydata['dog'];
echo $mydata['cat'];
Solution 8 - Php
**in create url page**
$data = array(
'car' => 'Suzuki',
'Model' => '1976'
);
$query = http_build_query(array('myArray' => $data));
$url=urlencode($query);
echo" <p><a href=\"index2.php?data=".$url."\"> Send </a><br /> </p>";
**in received page**
parse_str($_GET['data']);
echo $myArray['car'];
echo '<br/>';
echo $myArray['model'];
Solution 9 - Php
in the received page you can use:
parse_str($str, $array); var_dump($array);
Solution 10 - Php
You can combine urlencoded with json_encode
Exemple:
<?php
$cars = array
(
[0] => array
(
[color] => "red",
[name] => "mustang",
[years] => 1969
),
[1] => array
(
[color] => "gray",
[name] => "audi TT",
[years] => 1998
)
)
echo "<img src='your_api_url.php?cars=" . urlencode(json_encode($cars)) . "'/>"
?>
Good luck !
Solution 11 - Php
Very easy to send an array as a parameter.
User serialize
function as explained below
$url = www.example.com
$array = array("a" => 1, "b" => 2, "c" => 3);
To send array as a parameter
$url?array=urlencode(serialize($array));
To get parameter in the function or other side use unserialize
$param = unserialize(urldecode($_GET['array']));
echo '<pre>';
print_r($param);
echo '</pre>';
Array
(
[a] => 1
[b] => 2
[c] => 3
)