PHP で URL のパラメータを http_build_query で作る

<?php
$query = array (
	'q'	=>	'foo & bar',
	'u'	=>	'薫',
	'page'	=>	1
);
echo http_build_query ($query) . PHP_EOL;
?>

% php http_build_query.php
q=foo+%26+bar&u=%E8%96%AB&page=1

値が null だと

<?php
$query = array (
	'q'	=>	'foo & bar',
	'u'	=>	null,
	'page'	=>	1
);
echo http_build_query ($query) . PHP_EOL;
?>

q=foo+%26+bar&page=1

ついでにシグネチャをつけてみる。

<?php
$query = array (
	'q'	=>	'foo & bar',
	'u'	=>	'薫',
	'page'	=>	1
);
function Sign ($q, $secret)
{
	ksort ($q);
	return (sha1 (implode ('', array_values ($q) ) . $secret) );
}
$secret = '47425e4490d1548713efea3b8a6f5d778e4b1766';
$query['sign'] = Sign ($query, $secret);
echo http_build_query ($query) . PHP_EOL;
?>