I’m trying to write a script that when a user uploads a file and does not enter a name an error is returned. I’ve tried using is_null, empty, and isset and they all do not work. Eg, below, is_null returns an error even when a name is entered. Can anyone help?
$caption = $_REQUEST[$name_input_name]; if(is_null($caption)) { $file->error = 'Please Enter a Title'; return false; }
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Answer
isset()
will check if the variable is set, ie
<?php echo isset($var); // false $var = 'hello';
empty()
will check if the variable is empty, ie
<?php $emptyString = ''; echo empty($emptyString); // true
is_null()
will check for NULL
which is different from empty, because it’s set to NULL
not an empty string. (NULL might be a confusing concept)
Since your title is a string, I think you want to be using empty()
if (!isset($_REQUEST[$name_input_name]) || empty($_REQUEST[$name_input_name])) { $file->error = 'Please Enter a Title'; return false; }