isset and _get explain to me how this works? (Example)

if((isset($_GET[username]))&&(isset($_GET[password]))). print您的帳號 ... phpmethod=get>. 帳號:<input type=text name=username maxlength=8 size ...

2021年8月13日 — I know how to do something if a specific parameter exists : <?php if(isset($_GET['name'])) : ?>.

2016年10月25日 — I'm trying to wrap my head around this $_GET function. 1) If you add a question mark at the end of a URL e.g. ?category=books - the word ...

2021年3月6日 — if (isset($_GET)) parameter not working as expected PHP ... I am trying to check if $_GET[name_product] is present with if, but it seems not to ...

Determine if a variable is considered set, this means if a variable is declared and is different than null . If a variable has been unset with the unset() ...

2015年5月20日 — It's checking two different things to check if they're true. But, there's an error with the AND part, that should be &&. <?php if ( ...

2012年8月25日 — It's commonly referred to as 'shorthand' or the Ternary Operator. $test = isset($_GET['something']) ? $_GET['something'] : '';. means

In PHP, isset() is a function that determines whether a variable is set and is not NULL. The syntax for using isset() is isset(var) , where var is the name ...

The isset() function checks whether a variable is set, which means that it has to be declared and is not NULL. This function returns true if the variable exists ...

2021年6月22日 — I have a web site (test) that has a menu where you click an item, then text is displayed - or it would if I could solve some issues.