Comparing PHP functions: empty(), is_null(), isset().

#php #laravel

It seems like there might be a few typos in your question, but I'll assume you're asking about comparing three PHP functions: empty(), is_null(), and isset(). These functions are used to check the status and value of variables in PHP. Let's discuss each function and their differences:

In summary:

Use empty() to check if a variable is considered empty, including null.

$var1 = "";      // Empty string  // empty($var1) => true
$var1 = "0";     // Empty string  // empty($var1) => true
$var2 = null;    // Null value    //  empty($var2) => true
$var3 = 0;       // Numeric zero  // empty($var3) => true
$var4 = array(); // Empty array   // empty($var4) => true

Use is_null() to specifically check if a variable is null.

$var = null;  // is_null($var) => true
$var = 0;  // is_null($var) => false
$var = array();  // is_null($var) => false

Use isset() to check if a variable is set and not null.

$var = null; // isset($var) => false
$var = "Hello"; // isset($var) => true
$var = 0;      // isset($var) => true
$var = array();  // isset($var) => true