Missing some chars like german umlauts after use of htmlspecialchars? That's because the third param encoding has changed it's default value in PHP 5.4 from ISO-8859-1 to UTF-8.
Possible solution #1:
Change your code from this ...
<?php htmlspecialchars( 'äöü' ); ?>
... to this:
<?php htmlspecialchars ( 'äöü' , ENT_COMPAT | ENT_HTML401 , 'ISO-8859-1' ); ?>
Possible solution #2:
Create a wrapper function and replace htmlspecialchars( to i.e. isohtmlspecialchars( with your IDE/editor/shell...
Example of a wrapper function:
<?php
function isohtmlspecialchars( $str ){
return htmlspecialchars ( $str , ENT_COMPAT | ENT_HTML401 , 'ISO-8859-1' );
}
?>