php - check if variable empty - Stack Overflow
Jan 8, 2012 · Its worth noting - and I only found this out after nearly 9 years of PHP coding that the best way of checking any variable exists is using the empty() function. This is because it doesn't generate errors and even though you turn them off - PHP still generates them! empty() however won't return errors if the variable doesn't exist.
PHP - If variable is not empty, echo some html code
Mar 7, 2012 · @deceze It has been a while but you're right: empty does seem to absorb/suppress all notices/errors, avoiding the "Undefined offset/index" notice to be thrown due to a non-existing key in the array (even in PHP v4.4.9, just tested :). I …
PHP best way to check whether a string is empty or not
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Best way to initialize (empty) array in PHP - Stack Overflow
To be clear, the empty square brackets syntax for appending to an array is simply a way of telling PHP to assign the indexes to each value automatically, rather than YOU assigning the indexes. Under the covers, PHP is actually doing this:
php - isset () and empty () - what to use - Stack Overflow
As mentioned in the comments the lack of warning is also important with empty() PHP Manual says. empty() is the opposite of (boolean) var, except that no warning is generated when the variable is not set. Regarding isset. PHP Manual says. isset() will return FALSE if testing a variable that has been set to NULL
PHP short-ternary ("Elvis") operator vs null coalescing operator
Very good explanation, but don't miss this line: Note: ?: will throw PHP NOTICE on undefined (unset or !isset()) variables, you will still have to use !empty() or isset() (depending on the behaviour you need) if you cannot guarantee that a variable (specially an …
php - Remove empty array elements - Stack Overflow
Sep 7, 2010 · And if PHP's definition of empty isn't quite the same as your definition, then you can fill in the callback option with an anonymous function that throws out unwanted elements. Apparently you must have php 5.3 or later to use anonymous call backs.
How to check whether an array is empty using PHP?
This will be empty, ie PHP will return TRUE when using if empty() on the above. So if your array has keys - either by eg a form's input names or if you assign them manually (ie create an array with database column names as the keys but no values/data from the database), then the array will NOT be empty().
if statement - PHP: if !empty & empty - Stack Overflow
Jan 25, 2013 · PHP if empty condition is ignored. 0. Use of empty() and "or" in if statement PHP. 0. PHP check if a ...
What's the difference between 'isset()' and '!empty()' in PHP?
In other words, it checks to see if the variable is any value except NULL or not assigned a value. ISSET returns TRUE if the variable exists and has a value other than NULL. That means variables assigned a "", 0, "0", or FALSE are set, and therefore are TRUE for ISSET. EMPTY checks to see if a variable is empty.