Or expression doenst work

[lisa007]

is possible to use this expression

<?php if($tag=="home || about || contact"):?>

basically i what if tag equals home or about or contact is the way i'm trying valid

[Krik]

if($tag == "home" || $tag == "about" || $tag == "contact")

[dagon]

alternately, in_array()

$x=array('home','about','contact');

if(in_array($tag,$x)){

}

[laserlight]

If you do not actually need the array besides this check, I suggest:

if (in_array($tag, array('home','about','contact'))) {
    // ...
}

There is also the option of a switch, which may make sense if you are comparing $tag with many values to determine which of different actions should be done, rather than just checking whether or not to do a particular action.