Top "Isset" questions

In where shall I use isset() and !empty()

I read somewhere that the isset() function treats an empty string as TRUE, therefore isset() is not an effective way …

php isset

If isset $_SESSION goto this page?

Ok, having trouble here: I created a login script, so after a person logs in then they will get direted …

php session isset

PHP check if False or Null

I also get confused how to check if a variable is false/null when returned from a function. When to …

php isset

PHP: Check if variable exist but also if has a value equal to something

I have (or not) a variable $_GET['myvar'] coming from my query string and I want to check if this …

php variables if-statement isset

Check if value isset and null

I need to check if value is defined as anything, including null. isset treats null values as undefined and returns …

php null isset

PHP - Checking if array index exist or is null

Is there a way to check if an array index exists or is null? isset() doesn't tell you whether the …

php arrays null indexing isset

What does the exclamation point mean in PHP?

Possible Duplicate: Reference - What does this symbol mean in PHP? Getting confused with empty, isset, !empty, !isset In PHP …

php if-statement isset

How do I check if a $_GET parameter exists but has no value?

I want to check if the app parameter exists in the URL, but has no value. Example: my_url.php?…

php get isset is-empty

Check if array value isset and is null

How to check if array variable $a = array('a'=>1, 'c'=>null); is set and is null. function check($…

php arrays isset isnull

How to check if input type button is pressed in PHP?

The isset() function can be used to check if the input type submit is pressed, but is there a way …

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