PHP function to build query string from array

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[] = $key . '=' . urlencode( $key_value );

    }

    return implode( '&', $query_array );

}

I'm not aware of a builtin function, but there is the PECL class http://uk.php.net/manual/en/class.httpquerystring.php

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.

but for inverse this work, you can use :

void parse_str(str $input, array $output);
//for example:
$str = "first=value&arr[]=foo+bar&arr[]=baz";
parse_str($str);
echo $first;  // value
echo $arr[0]; // foo bar
echo $arr[1]; // baz

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

Good luck.