While I consider myself a fairly experienced PHP programmer, only
recently I've found the wonderful 'create_function' function which
creates an anonymous function that can be passed around as a variable
value.
This allowed me to write a class that helps working with arrays,
although it could be easily modified to work with any value type.
For example, you can use it to check for required input arguments:
if ( ! Enum::has($_GET, array('id','user')) ) die('Required arguments
are missing';
...or to make all strings in an array uppercase:
$array = Enum::collect($array, Enum::newFilter(' uppercase($value) '));
Personally, I love it :)
<?
/**
Enum class by Michal Tatarynowicz ([EMAIL PROTECTED])
Licenced as Public Domain
Usage:
$input = array(
'a' => '1',
'b' => '2',
'c' => '2',
'd' => '3'
);
$multiply_by_two = Enum::newFilter(' $value*2 ');
print_r( Enum::collect($input, $multiply_by_two) );
// Array ( [a] => 2 [b] => 4 [c] => 4 [d] => 6 )
$key_is_b = Enum::newFilter(' $key=="b" ');
print_r( Enum::find($input, $key_is_b) );
// 2
$pass_a_and_c_keys = Enum::newFilter(' in_array($key, array("a","c"))
');
print_r( Enum::filter($input, $pass_a_and_c_keys) );
// Array ( [a] => 1 [c] => 2 )
$pass_odd_values = Enum::newFilter(' $value%2 ');
print_r( Enum::filter($input, $pass_odd_values) );
// Array ( [a] => 1 [d] => 3 )
print_r( Enum::has($input, array('z')) );
// 0
*/
class Enum {
/** Create a new anonymous function to use as a filter */
function newFilter ($code) {
return create_function('$value,$key', "return $code;");
}
/** Return array of every element passed thru $func */
function collect ($array, $filter) {
$output = array();
foreach ($array as $key=>$value) {
$output[$key] = $filter($value, $key);
}
return $output;
}
/** Return value of first element that matches $func */
function find ($array, $selector, $default=false) {
foreach ($array as $key=>$value) {
if ($selector($value, $key)) return $value;
}
return $default;
}
/** Return array of all elements for which $selector returns true */
function filter ($array, $selector) {
$output = array();
foreach ($array as $key=>$value) {
if ($selector($value, $key)) $output[$key] = $value;
}
return $output;
}
/** Returns true if array has all keys in $keys */
function has ($array, $keys, $non_empty=false) {
foreach ($keys as $key) {
if (!isset($array[$key]) || ($non_empty && !$array[$key]))
return 0;
}
return true;
}
};
?>
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