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I need to take an array like I have below:
$subids = Array ( [s1] => one [s2] => two [s3] => three [s4] => four [s5] => five [s6] => six ) and generate a URL such as http://example.com?s1=one&s2=two&s3=three=&s4=four&s5=five&s6=six
All of the subids are not always defined, so sometimes s3 may not be defined, so it shouldn't be appended to the URL. Additionally, whatever the first subid is, it has to have the ? preceding it instead of the ampersand (&)
So if the array is just:
$subids = Array ( [s2] => two [s6] => six ) then the URL needs to be http://example.com?s2=two&s6=six
I have the following so far:
$url = 'http://example.com'
foreach ($subids AS $key => $value) { $result[$id]['url'] .= '&' . $key . '=' . $value; } However, I'm not sure what the best way would be to append the ? at the beginning of the first key/value pair.
I feel like there's a PHP function to help with this but I'm not finding much. I'm using Codeigniter if there's anything I can use that is provided by CI.
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You can use http_build_query to generate a URL-encoded querystring from an array in PHP. Whilst the resulting querystring will be expanded, you can decide on a unique separator you want as a parameter to the http_build_query method, so when it comes to decoding, you can check what separator was used.
Any word after the question mark (?) in a URL is considered to be a parameter which can hold values. The value for the corresponding parameter is given after the symbol "equals" (=). Multiple parameters can be passed through the URL by separating them with multiple "&".
We can also use urlencode() function with serialize() function to create an URL-encoded string. In the given example, first we have converted the array into its byte stream representation, which is a string using serialize() function. And then, we have created an URL-encoded string of that byte stream.
We can also pass an array with tuples or a query string. With that done, we now have an instance of the URLSearchParams class. We can get the string version of this by calling toString and append this to our URL.
All you need is http_build_query:
$final = $url . "?" . http_build_query($subids); You can use with http_build_query() function. Example from php.net:
<?php $data = array( 'foo' => 'bar', 'baz' => 'boom', 'cow' => 'milk', 'php' => 'hypertext processor', ); echo http_build_query( $data ) . "\n"; echo http_build_query( $data, '', '&' ); ?> And output this lines:
foo=bar&baz=boom&cow=milk&php=hypertext+processor foo=bar&baz=boom&cow=milk&php=hypertext+processor You can read from the source: http://www.php.net/manual/en/function.http-build-query.php
BTW, If you use with WordPress, you can this function: http://codex.wordpress.org/Function_Reference/add_query_arg
Have fun. :)
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