++ bug or unexpected behaviour

I think "$t++" and "$t=$t+1" should produces the same results, shouldn´t they? 1) This does not work as expected, $t is not converted to an integer, although it does not contain any character. <?php $t=''; // $t=0; will help... $t++; print $t; ?> 2) This does work. $t++ replaced with $t=$t+1; <?php $t=''; $t=$t+1; print $t; ?> regards -- o----------0-¬---------O-·---¬----o---®-----o o O ° . | http://www.kiffen.de | pRoteçt y0ur bRaín |0 O ° ¤ ° · 0°·³°²'²³-¹'³´³°^°³~³²³°'³²²¨³²^³¹³²°²³`³º³°Þ ° o © ° . · | psychedelic experience | gott@kiffen.de | O ° o ° o-¬--o--0-----©-·--O-----o-----0-¤----------o 0 ° · ° . ¤ ·