PHP and logical operators? -


i writing own permission class forum , i've run small problem can understand.

i have following function:

function edittopic($perm_edit_topic, $id, $user_id, $my_id, $permission){    if($perm_edit_topic == true && $user_id == $my_id or $permission == 0 xor $permission == 1){           echo '<a href="/forum/newtopic.php?edit='.$id.'" class="buttonpro" data-toggle="tooltip" data-placement="top" title="edit"><i class="fa fa-pencil-square-o fa-fw"></i></a>';     }   }

i want if statement following:

if $perm_edit_topic set true , $user_id (which stored user_id topic) user id of viewing user or permission id either 0 or 1 (where 0 admin , 1 moderator).

this works okay. owner of topic , admin , mods can edit. if set $perm_edit_topic false moderator, can still edit it.

did wrong in if statement?

replace condition this:

$perm_edit_topic && ($user_id == $my_id || $permission == 0 || $permission == 1)

  • $perm_edit_topic == true has exact same meaning $perm_edit_topic

  • wrap of other conditions inside of parenthesis control short circuiting, quite unintuitive how works combination of and'ing, or'ing, , xor'ing. if not familiar short circuiting try running example: does php have short-circuit evaluation?

  • inside parenthesis of conditions being true enough entire expression true. both $permission == 0 , $permission == 1 cannot true, not make sense xor them


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