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Posted By

ikimozu on 04/27/09


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is_null

 / Published in: PHP
 

null -> true 0 -> false '0' -> false '' -> true

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  1. <?php
  2. function is_null(&$var){
  3. 	if(!isset($var)){
  4. 		return true;
  5. 	}
  6. 	$var=(!is_array($var)) ? trim($var) : $var;
  7. 	if(gettype($var)=='string' && $var==='0'){
  8. 		return false;
  9. 	}else if(gettype($var)=='integer' && $var===0){
  10. 		return false;
  11. 	}else if(gettype($var)=='string' && $var===''){
  12. 		return true;
  13. 	}else if(gettype($var)=='NULL'){
  14. 		return true;
  15. 	}
  16. 	return false;
  17. }
  18. ?>

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