PHP function to recursively implode multi-dimensional arrays.

PHP-Recursive-Implosion.php

<?php

/**
 * Recursively implodes an array with optional key inclusion
 * 
 * Example of $include_keys output: key, value, key, value, key, value
 * 
 * @access  public
 * @param   array   $array         multi-dimensional array to recursively implode
 * @param   string  $glue          value that glues elements together	
 * @param   bool    $include_keys  include keys before their values
 * @param   bool    $trim_all      trim ALL whitespace from string
 * @return  string  imploded array
 */ 
function recursive_implode(array $array, $glue = ',', $include_keys = false, $trim_all = true)
{
	$glued_string = '';

	// Recursively iterates array and adds key/value to glued string
	array_walk_recursive($array, function($value, $key) use ($glue, $include_keys, &$glued_string)
	{
		$include_keys and $glued_string .= $key.$glue;
		$glued_string .= $value.$glue;
	});

	// Removes last $glue from string
	strlen($glue) > 0 and $glued_string = substr($glued_string, 0, -strlen($glue));

	// Trim ALL whitespace
	$trim_all and $glued_string = preg_replace("/(\s)/ixsm", '', $glued_string);

	return (string) $glued_string;
}