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    PHP Conditional Assignment Operators: Efficient Variable Assignments

    Rumman Ansari July 09, 2024 6,140 views
    PHP Conditional Assignment Operators: Efficient Variable Assignments

    The PHP conditional assignment operators are used to set a value depending on conditions:

    Operator Name Example Result
    ?: Ternary $x = expr1 ? expr2 : expr3 Returns the value of $x.
    The value of $x is expr2 if expr1 = TRUE.
    The value of $x is expr3 if expr1 = FALSE
    ?? Null coalescing $x = expr1 ?? expr2 Returns the value of $x.
    The value of $x is expr1 if expr1 exists, and is not NULL.
    If expr1 does not exist, or is NULL, the value of $x is expr2.
    Introduced in PHP 7

    Example: ?: Ternary

    Code: 

    
<!DOCTYPE html>
<html>
<body>

<?php
   // if empty($user) = TRUE, set $status = "unknown"
   echo $status = (empty($user)) ? "unknown" : "logged in";
   echo("<br>");

   $user = "Rambo Azmi";
   // if empty($user) = FALSE, set $status = "logged in"
   echo $status = (empty($user)) ? "unknown" : "logged in";
?>  

</body>
</html>

    Output:

    The above code will produce the following result-

    
unknown
logged in

    Example:

    Code: 

    
<!DOCTYPE html>
<html>
<body>

<?php
   // if empty($user) = TRUE, set $status = "unknown"
   echo $status = (empty($user)) ? "unknown" : "logged in";
   echo("<br>");

   $user = "Rambo Azmi";
   // if empty($user) = FALSE, set $status = "logged in"
   echo $status = (empty($user)) ? "unknown" : "logged in";
?>  

</body>
</html>

    Output:

    The above code will produce the following result-

    
unknown
logged in