asort
A quick way of compacting all local variables:
<?php
$localVariables = compact(array_keys(get_defined_vars()));
?>
This is useful if you want to return all local variables from a function/method or you want to pass all local variables to one. A valid example would be to use this with application hooks/events (if you want the called hook to be able to modify everything in the caller), but otherwise use with care (as methods should be used through their declared interface).
compact
(PHP 4, PHP 5)
compact — 변수와 그 값을 가지는 배열 생성
설명
변수와 그 값을 가지는 배열을 생성합니다.
이들 각각에 대해, compact() 는 현재 심볼 테이블에서 그 이름을 갖는 변수를 찾고, 그 변수명이 키가 되고 변수의 내용은 그 키에 대한 값이 될수 있도록 출력 배열에 추가한다. 짧게 말해서, 이 함수는 extract()과 반대이다.
선언되지 않은 모든 문자열은 단순히 무시합니다.
인수
- varname
-
compact()는 가변 인수를 가집니다. 각 인수는 변수명을 가지는 문자열이거나, 변수명의 배열일 수 있습니다. 배열은 그 안에 변수명을 가지는 다른 배열을 포함할 수 있습니다; compact()는 재귀적으로 다룹니다.
반환값
모든 변수를 추가한 결과 배열을 반환합니다.
예제
Example #1 compact() 예제
<?php
$city = "San Francisco";
$state = "CA";
$event = "SIGGRAPH";
$location_vars = array("city", "state");
$result = compact("event", "nothing_here", $location_vars);
?>
위 예제의 출력:
Array
(
[event] => SIGGRAPH
[city] => San Francisco
[state] => CA
)
add a note
User Contributed Notes
compact
piedone at pyrocenter dot hu
15-Apr-2011 06:00
Robc
19-Jan-2011 03:16
The description says that compact is the opposite of extract() but it is important to understand that it does not completely reverse extract(). In particluar compact() does not unset() the argument variables given to it (and that extract() may have created). If you want the individual variables to be unset after they are combined into an array then you have to do that yourself.
tatarynowicz at gmail dot com
10-Jan-2011 03:17
Please note that compact() will _not_ issue a warning if the specified variable name is undefined.
Anonymous
06-Apr-2009 03:41
Compact does not work with references, but there is a short way to resolve this:
<?php
//$foo=array();
foreach( array('apple','banana') as $v) $foo[$v] = &$v;
?>
packard_bell_nec at hotmail dot com
31-Jan-2008 09:46
You can check whether a variable is defined by using array_key_exists()!
First, you may ask that no reserved array (would be called $LOCALS) is predefined in function scope (contrast to reserved array $GLOBALS in global scope. To solve it, you can use compact().
Then, you may ask that why property_exists() cannot be used. This is because no reserved function is predefined to create OBJECT containing variables and their values, and no reserved function is predefined to import variables into the current symbol table from an OBJECT. In addition, property_exists() breaks the naming convention of reserved function.
Finally, I show how to check whether a variable is defined by using array_key_exists():
<?php
function too(){
$roo = array_key_exists('foo', compact('foo'));
echo ($roo?'1':'0').'<br/>';
$foo = null;
$roo = array_key_exists('foo', compact('foo'));
echo ($roo?'1':'0').'<br/>';
}
too();
?>
The output will be:
0<br/>
1<br/>
M Spreij
24-May-2007 06:10
Can also handy for debugging, to quickly show a bunch of variables and their values:
<?php
print_r(compact(explode(' ', 'count acw cols coldepth')));
?>
gives
Array
(
[count] => 70
[acw] => 9
[cols] => 7
[coldepth] => 10
)
mijllirg at wearethedotin dot com
17-Nov-2005 11:38
You might could think of it as ${$var}. So, if you variable is not accessible with the ${$var} it will not working with this function. Examples being inside of function or class where you variable is not present.
<?php
$foo = 'bar';
function blah()
{
// this will no work since the $foo is not in scope
$somthin = compact('foo'); // you get empty array
}
?>
PS: Sorry for my poor english...
hericklr at gmail dot com
13-Jun-2005 08:43
The compact function doesn't work inside the classes or functions.
I think its escope is local...
Above it is a code to help about it.
Comments & Suggestions are welcome.
PS: Sorry for my poor english...
<?php
function x_compact()
{ if(func_num_args()==0)
{ return false; }
$m=array();
function attach($val)
{ global $m;
if((!is_numeric($val)) && array_key_exists($val,$GLOBALS))
{ $m[$val]=$GLOBALS[$val];}
}
function sub($par)
{ global $m;
if(is_array($par))
{ foreach($par as $cel)
{ if(is_array($cel))
{ sub($cel); }
else
{ attach($cel); }
}
}
else
{ attach($par); }
return $m;
}
for($i=0;$i<func_num_args();$i++)
{ $arg=func_get_arg($i);
sub($arg);
}
return sub($arg);
}
?>
pillepop2003 at yahoo dot de
22-Nov-2004 12:26
Use the following piece of code if you want to insert a value into an array at a path that is extracted from a string.
Example:
You have a syntax like 'a|b|c|d' which represents the array structure, and you want to insert a value X into the array at the position $array['a']['b']['c']['d'] = X.
<?
function array_path_insert(&$array, $path, $value)
{
$path_el = split('\|', $path);
$arr_ref =& $array;
for($i = 0; $i < sizeof($path_el); $i++)
{
$arr_ref =& $arr_ref[$path_el[$i]];
}
$arr_ref = $value;
}
$array['a']['b']['f'] = 4;
$path = 'a|b|d|e';
$value = 'hallo';
array_path_insert($array, $path, $value);
/* var_dump($array) returns:
array(1) {
["a"]=>
&array(1) {
["b"]=>
&array(2) {
["f"]=>
int(4)
["d"]=>
&array(1) {
["e"]=>
string(5) "hallo"
}
}
}
*/
?>
Rock on
Philipp