I'm looking for the name of the PHP function to build a query string from an array of key value pairs. Please note, I am looking for the built in PHP function to do this, not a homebrew one (that's all a google search seems to return). There is one, I just can't remember its name or find it on php.net. IIRC its name isn't that intuitive.
asked Dec 30, 2008 at 16:49
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5 Answers
4
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This is a quite new function, available from PHP 5.Calmarius– Calmarius07/04/2012 18:32:37Commented Jul 4, 2012 at 18:32
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16Be careful with this function! It will omit any key-value pair where the value is NULL.
echo http_build_query(array("foo"=>"bar","bar"=>null))will produce onlyfoo=barcb0– cb008/13/2014 13:06:34Commented Aug 13, 2014 at 13:06 -
@cb0 this works similar to form submits in a browser, an empty input field will not be included in the submitted query.TJ L– TJ L08/05/2016 17:28:01Commented Aug 5, 2016 at 17:28
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1@ceejayoz Well you've known it for a long time now... Your wish has come true?Andrew– Andrew11/30/2016 19:56:30Commented Nov 30, 2016 at 19:56
Here's a simple php4-friendly implementation:
/**
* Builds an http query string.
* @param array $query // of key value pairs to be used in the query
* @return string // http query string.
**/
function build_http_query( $query ){
$query_array = array();
foreach( $query as $key => $key_value ){
$query_array[] = urlencode( $key ) . '=' . urlencode( $key_value );
}
return implode( '&', $query_array );
}
answered May 13, 2011 at 19:54
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1When doing its decoding, PHP appears to percent-decode the key as well. Possibly worth doing that here?cloudfeet– cloudfeet08/01/2013 15:38:26Commented Aug 1, 2013 at 15:38
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@cloudfeet seems reasonable to do so. Thanks for pointing it out.0x6A75616E– 0x6A75616E08/01/2013 17:35:06Commented Aug 1, 2013 at 17:35
Just as addition to @thatjuan's answer.
More compatible PHP4 version of this:
if (!function_exists('http_build_query')) {
if (!defined('PHP_QUERY_RFC1738')) {
define('PHP_QUERY_RFC1738', 1);
}
if (!defined('PHP_QUERY_RFC3986')) {
define('PHP_QUERY_RFC3986', 2);
}
function http_build_query($query_data, $numeric_prefix = '', $arg_separator = '&', $enc_type = PHP_QUERY_RFC1738)
{
$data = array();
foreach ($query_data as $key => $value) {
if (is_numeric($key)) {
$key = $numeric_prefix . $key;
}
if (is_scalar($value)) {
$k = $enc_type == PHP_QUERY_RFC3986 ? urlencode($key) : rawurlencode($key);
$v = $enc_type == PHP_QUERY_RFC3986 ? urlencode($value) : rawurlencode($value);
$data[] = "$k=$v";
} else {
foreach ($value as $sub_k => $val) {
$k = "$key[$sub_k]";
$k = $enc_type == PHP_QUERY_RFC3986 ? urlencode($k) : rawurlencode($k);
$v = $enc_type == PHP_QUERY_RFC3986 ? urlencode($val) : rawurlencode($val);
$data[] = "$k=$v";
}
}
}
return implode($arg_separator, $data);
}
}
there's no need to do that
GuzzleClient($config)->Request($method , $uri , [ 'json'=>[...] , 'query'=> $your_query_array ])
query will fill up your uri-query
from 2023 :D
Implode will combine an array into a string for you, but to make an SQL query out a kay/value pair you'll have to write your own function.
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Tried that but it won't work. I'm trying to build an http query string which requires both the keys and the values from the array, implode can't do this.Robin Barnes– Robin Barnes12/30/2008 17:00:21Commented Dec 30, 2008 at 17:00
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2I see, wasn't sure if you meant an SQL query string or a http query string.Ali– Ali12/30/2008 21:05:50Commented Dec 30, 2008 at 21:05
