Ask a question to judge the $_post pass parameter, cannot fetch the number

There is a new/modified feature on the Web page, a
if (Isset ($_post[' id ')) && isset ($_post[' uname ']) &&!empty ($_post[' id ')) &&!empty ($_post[') Uname '])) {
$id = $_post[' id '];
$uname = $_post[' uname ');
if ($pid ==0) {
New User---------------------If the value passed in is 0, the statement is not executed, and if the value is 00, the statement is executed.
}else{
Modify User
}
}
Cleanparameters ($_get);
Cleanparameters ($_post);
?>

Reply to discussion (solution)

Because
So
if (Isset ($_post[' id ')) && isset ($_post[' uname ']) &&!empty ($_post[' id ')) &&!empty ($_post[') Uname ']))
Because the part of the set broken is not established, will not enter the branch

Because
So
if (Isset ($_post[' id ')) && isset ($_post[' uname ']) &&!empty ($_post[' id ')) &&!empty ($_post[') Uname ']))
Because the part of the set broken is not established, will not enter the branch

Why would id=0 be considered empty? 0 at least it's a value! It's not empty.

$a = ' 0 '; Var_dump (! empty ($a));//bool (false)

You can see the description of empty

Rules are for you to obey, maybe a little passable.

if ($pid ==0) {There is also a problem here, $pid no value, $pid = $_post[' id ')

Empty? Checks if a variable is empty
BOOL Empty (mixed $var)
That's the way the rules are.
If Var is a non-null or nonzero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any properties will be considered empty and return TRUE if Var is empty.

If you want to determine that 0 is non-null, you can write this.
if (Isset ($_post[' id ') && isset ($_post[' uname ']) &&! (Empty ($_post[' id ') && $_post[' id ']!=0) &&!empty ($_post[' uname '])) {

Determine if a form submission requires only
if ($_server[' request_method '] = = "POST")
A little bit more simple is
if ($_post)

The submitted data is always a string, so determine if the ID control is 0
if ($_post[' id ') = = = ' 0 ')
Can

Of course
if ($_post[' id ') = = ' 0 ')
if (Empty ($_post[' id ')))
It's all right, but you can't tell whether it's a blank or a 0.

if ($_post) {    $id = $_post[' id '];    $uname = $_post[' uname ');    if ($id ==0) {      New user---------------------If the value passed in is 0, the statement is not executed, and if the value is 00, the statement is executed.    }else{      Modify user    }}

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