Description:
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Server: Win XP pro, Apache 2.0.49/ PHP 4.3.7

The following string is misread and replaced by PHP with "". There was no such problem in PHP up to 4.3.4 but was noticed since PHP 4.3.5

Reproduce code:
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Following will be rendered as $blank = ""; by PHP.
$blank = '<img src="images/blank.gif" width="1" height="1" alt="" />';

There is no error and the out put is simply nothing.
Example:
echo $blank; # would out put nothing


However, the followings would work fine:
$blank = '<img src="images/blank.gif" width="2" height="1" alt="" />';
$blank = '<img src="images/blank.gif" width="1" height="2" alt="" />';
$blank = '<img src="images/blank.gif" height="1" alt="" />';
$blank = '<img src="images/blank.gif" width="1" alt="" />';

The problem seems to be the combination of (width="1" height="1").