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Explain the difference between isset() and empty() functions in PHP
The isset() function in PHP is used to determine whether a variable is set and is not NULL. It returns true if the variable is set and has a non-null value, and false otherwise. On the other hand, the empty() function is used to check if a variable has an empty value, such as an empty string, 0, false, null, or an empty array. It returns true if the variable is empty, and false if it contains a non-empty value.
Examples of when to use isset() and empty() functions:
isset() function:
Use the isset() function to check if a variable has been set before using it in a piece of code:
$name = "John";
if (isset($name)) {
echo "The variable 'name' is set.";
} else {
echo "The variable 'name' is not set.";
}
empty() function:
Use the empty() function to check if a variable contains an empty value:
$name = "";
if (empty($name)) {
echo "The variable 'name' is empty.";
} else {
echo "The variable 'name' is not empty.";
}
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