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empty vs isset
Difference between 
empty
and 
isset
$var = 0;

// Evaluates to true because $var is empty
if (empty($var)) {
    echo '$var is either 0, empty, or not set at all';
}

// Evaluates as true because $var is set
if (isset($var)) {
    echo '$var is set even though it is empty';
}
The following values are considered to be false: 
""
(an empty string) 
0
(0 as an integer) 
0.0
(0 as a float) 
"0"
(0 as a string) 
NULL
FALSE
array()
(an empty array)
by Valeri Tandilashvili
5 years ago
PHP
functions
Object Oriented PHP Tutorial
1
Pro tip: use ```triple backticks around text``` to write in code fences