Flatten Multidimentional Arrays in PHP

array_flatten.php

<?php
function array_flatten($arrays) { 
	if ( !is_array($arrays) ) 
	{ 
		return false; 
	} 

	$result = array(); 
	foreach ( $arrays as $key => $value ) 
	{ 
		if ( is_array($value) ) 
		{ 
			$result = array_merge( $result, array_flatten($value) ); 
		} 
		else 
		{ 
			$result[$key] = $value; 
		} 
	} 
	return $result; 
}

// Example 
$array = array( 
	'a' => 'letter',
	'b' => array(
		'b1' => 'bb',
		'b2' => 'bb',
		'b3' => array(
			'bb1' => 'bbb'
		)
	)
);

// array_flatten($array)
echo '<pre>' . var_export(array_flatten($array), true) . '</pre>';

// Return
array (
  'a' => 'letter',
  'b1' => 'bb',
  'b2' => 'bb',
  'bb1' => 'bbb',
)