<?php
function modifyQuery($url, $query) {
	// Convert query string to array
	if (! is_array($query)) {
		parse_str($query, $query);
	}
	
	// Extract the components in a url string
	$components = parse_url($url);
	
	if (! isset($components['query'])) {
		$components['query'] = '';
	}
	parse_str($components['query'], $components['query']);
	
	// Combine the queries
	$components['query'] = array_merge($components['query'], $query);
	
	// Put the components together
	$url = isset($components['host']) 
		? "{$components['scheme']}://{$components['host']}"
		: '/';
	$url .= isset($components['path']) ? $components['path'] : '/';
	$url .= empty($components['query']) ? '' : '?'.http_build_query($components['query']);
	$url .= isset($components['fragment']) ? "#{$components['fragment']}" : '';
	
	return $url;
}
?>

php

1

Dynamically change URL query string.

<?php
function modifyQuery($url, $query) {
	// Convert query string to array
	if (! is_array($query)) {
		parse_str($query, $query);
	}
	
	// Extract the components in a url string
	$components = parse_url($url);
	
	if (! isset($components['query'])) {
		$components['query'] = '';
	}
	parse_str($components['query'], $components['query']);
	
	// Combine the queries
	$components['query'] = array_merge($components['query'], $query);
	
	// Put the components together
	$url = isset($components['host']) 
		? "{$components['scheme']}://{$components['host']}"
		: '/';
	$url .= isset($components['path']) ? $components['path'] : '/';
	$url .= empty($components['query']) ? '' : '?'.http_build_query($components['query']);
	$url .= isset($components['fragment']) ? "#{$components['fragment']}" : '';
	
	return $url;
}
?>

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• get, 
• http, 
• http_build_query, 
• parse_string, 
• php, 
• query, 
• url