note 52662 added to function.is-null
| From: | disappear at dissolution dot ath dot cx | Date: | Mon, 09 May 2005 03:51:05 +0000 |
| Subject: | note 52662 added to function.is-null | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-89143@lists.php.net to get a copy of this message | ||
i wrote a small case study to compare is_null / == NULL / === NULL
Here's the code ::
<?php
$Array = array ( 0 , '' , FALSE , NULL ) ;
$ArrayCount = count ( $Array ) ;
$String .= '$Array = ' . "array ( 0 , '' , FALSE , NULL )
<br><br>" ;
for ( $i = 0 ; $i < $ArrayCount ; $i++ )
{
if ( $Array [ $i ] == NULL )
{
$String .= '$Array [ $i ] == NULL :: $Array [ ' . $i . ' ]
<br>' ;
}
if ( $Array [ $i ] === NULL )
{
$String .= '$Array [ $i ] === NULL :: $Array [ ' . $i . ' ]
<br>' ;
}
if ( is_null ( $Array [ $i ] ) )
{
$String .= 'is_null ( $Array [ $i ] ) :: $Array [ ' . $i . ' ]
<br>' ;
}
}
echo $String ;
?>
Here's the results i got ::
$Array = array ( 0 , '' , FALSE , NULL )
$Array [ $i ] == NULL :: $Array [ 0 ]
$Array [ $i ] == NULL :: $Array [ 1 ]
$Array [ $i ] == NULL :: $Array [ 2 ]
$Array [ $i ] == NULL :: $Array [ 3 ]
$Array [ $i ] === NULL :: $Array [ 3 ]
is_null ( $Array [ $i ] ) :: $Array [ 3 ]
----
Manual Page -- http://www.php.net/manual/en/function.is-null.php
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