PHP: Array_merge by value, or array merge by values and keys

gistfile1.aw

/**
L. Sauer,2011
license: public domain
http://xhr2.blogspot.com/2011/09/php-arraymerge-by-value-or-array-merge.html
*/

	function array_merge_values_explode(){
		$args = func_get_args();
		$elem = array();
		$delim = strlen(end($args))<=2 ? array_pop($args) : ',';
		for($i=0; $i<count($args); $i++){
			$elem += array_flip(explode($delim, $args[$i]));
		}
		
		//sort and reorder keys
		$elem = array_combine(  range( 0,(-1+count($elem))), array_keys($elem) ); //combine( arr $keys, arr $values)
		return	$elem;
	}
	function array_merge_values($arr1, $arr2){
		$merge = array_merge(
					array_flip($arr1),
					array_flip($arr2)
				);
		return	
			array_combine(
				range( 0,count($merge)-1, array_keys($merge) )
			 ); //array_flip would eliminate same-valued(->indexed) pairs 
	}

//Example
$httpvar_loadwsdl = "kegg,pathexplorer,metabol";
defined('RPC_DEFAULT_CACHED_SERVICE')
	|| define('RPC_DEFAULT_CACHED_SERVICE', 'pubchem,kegg');
//notice the defaults are intentionally rightmost as they take precedence
print_r( 
	array_merge_values_explode($httpvar_loadwsdl, RPC_DEFAULT_CACHED_SERVICE) 
);



Array
(
    [0] => kegg
    [1] => pathexplorer
    [2] => metabol
    [3] => pubchem
)

php array merge by value

/**
L. Sauer,2011
license: public domain
http://xhr2.blogspot.com/2011/09/php-arraymerge-by-value-or-array-merge.html
*/

	function array_merge_values_explode(){
		$args = func_get_args();
		$elem = array();
		$delim = strlen(end($args))<=2 ? array_pop($args) : ',';
		for($i=0; $i<count($args); $i++){
			$elem += array_flip(explode($delim, $args[$i]));
		}
		
		//sort and reorder keys
		$elem = array_combine(  range( 0,(-1+count($elem))), array_keys($elem) ); //combine( arr $keys, arr $values)
		return	$elem;
	}
	function array_merge_values($arr1, $arr2){
		$merge = array_merge(
					array_flip($arr1),
					array_flip($arr2)
				);
		return	
			array_combine(
				range( 0,count($merge)-1, array_keys($merge) )
			 ); //array_flip would eliminate same-valued(->indexed) pairs 
	}

//Example
$httpvar_loadwsdl = "kegg,pathexplorer,metabol";
defined('RPC_DEFAULT_CACHED_SERVICE')
	|| define('RPC_DEFAULT_CACHED_SERVICE', 'pubchem,kegg');
//notice the defaults are intentionally rightmost as they take precedence
print_r( 
	array_merge_values_explode($httpvar_loadwsdl, RPC_DEFAULT_CACHED_SERVICE) 
);



Array
(
    [0] => kegg
    [1] => pathexplorer
    [2] => metabol
    [3] => pubchem
)

phparraymergebyvalue

/**
L. Sauer,2011
license: public domain
http://xhr2.blogspot.com/2011/09/php-arraymerge-by-value-or-array-merge.html
*/

	function array_merge_values_explode(){
		$args = func_get_args();
		$elem = array();
		$delim = strlen(end($args))<=2 ? array_pop($args) : ',';
		for($i=0; $i<count($args); $i++){
			$elem += array_flip(explode($delim, $args[$i]));
		}
		
		//sort and reorder keys
		$elem = array_combine(  range( 0,(-1+count($elem))), array_keys($elem) ); //combine( arr $keys, arr $values)
		return	$elem;
	}
	function array_merge_values($arr1, $arr2){
		$merge = array_merge(
					array_flip($arr1),
					array_flip($arr2)
				);
		return	
			array_combine(
				range( 0,count($merge)-1, array_keys($merge) )
			 ); //array_flip would eliminate same-valued(->indexed) pairs 
	}

//Example
$httpvar_loadwsdl = "kegg,pathexplorer,metabol";
defined('RPC_DEFAULT_CACHED_SERVICE')
	|| define('RPC_DEFAULT_CACHED_SERVICE', 'pubchem,kegg');
//notice the defaults are intentionally rightmost as they take precedence
print_r( 
	array_merge_values_explode($httpvar_loadwsdl, RPC_DEFAULT_CACHED_SERVICE) 
);



Array
(
    [0] => kegg
    [1] => pathexplorer
    [2] => metabol
    [3] => pubchem
)

The union Array operator could be used as well, instead of array_merge: $Array1 + $Array2 + $Array3
A difference is, that array_merge is more convenient for implementing a well-performing generic function with an undefined number of parameters.