PHP - is_empty

Key differences:
- arrays containing empty values are empty
* this works recursively; sub arrays are checked as well
* if an array contains even one non-empty value, it is not empty
- numeric strings, with any amount of zeros, (like "0000000000.000") are empty
- the value being tested does not need to be a variable

Code:

<?php
 function is_empty($var) {
    if (is_null($var)) {
       return true;
    } elseif (is_bool($var)) {
       return !$var;
    } elseif (is_int($var)||is_float($var)||is_string($var)) {
       return preg_match("/^0*.?0*$/",$var);
    } elseif (is_array($var)) {
       foreach ($var as $val) {
          if (!is_empty($val)) {
             return false;
          }
       }
       return true;
    } elseif (is_object($var)||is_resource($var)) {
       return false;
    }
    return empty($var);
 }
?>

Example:
Code:

<?php
 // These should all be true:
 foreach (array(false,"",0,"0.0",array(),array(array())) as $var) {
    var_dump($var);
    echo "is empty: ".(is_empty($var)?"true":"false")."<br />n";
 }
 echo "---<br />\n";
 // These should all be false:
 foreach (array(true,"string",1,"1.0",array(0=>"value"),array(array("value"))) as $var) {
    var_dump($var);
    echo "is empty: ".(is_empty($var)?"true":"false")."<br />n";
 }
?>

Yields:

bool(false) is empty: true
string(0) "" is empty: true
int(0) is empty: true
string(3) "0.0" is empty: true
array(0) { } is empty: true
array(1) { [0]=> array(0) { } } is empty: true
---
bool(true) is empty: false
string(6) "string" is empty: false
int(1) is empty: false
string(3) "1.0" is empty: false
array(1) { [0]=> string(5) "value" } is empty: false
array(1) { [0]=> array(1) { [0]=> string(5) "value" } } is empty: false

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