$$ in php

$x = "abc";  
$$x = 200;  
echo $x."<br/>";  
echo $$x."<br/>";  
echo $abc; 

// output:
abc
200
200

?? ' ' in php

// Null Coalesce Operator - $statement ?? ''
$categoryName = $category->name ?? 'Not Available';

// The above Statement is identical to this if/else statement
if (isset($category->name)) {
    $categoryName = $category->name;
} else {
    $categoryName  = 'Not Available';
}

-2

Similar codes

1 vote297 views2 answers
Get the unique rows from table laravel
PHP
2 votes296 views2 answers
Twig ternary
PHP
15 votes268 views3 answers
Pass data to blade laravel
PHP
0 vote295 views1 answer
Update button
PHP
0 vote357 views2 answers
Mysqli_fetch_all() expects parameter 1 to be mysqli_result, boolean given in C:\xampp\htdocs\complete-blog-php\admin\includes\post_functions.php on line 31
PHP
1 vote309 views2 answers
Php http errorcode
PHP
15 votes305 views3 answers
Alert js in php
PHP
2 votes290 views2 answers
How to do laravel in sidebar active menu dynamic blade
PHP
0 vote315 views2 answers
How to rollback if one table in laravel didn't save data successfully
PHP Laravel
0 vote314 views3 answers
Laravel postgres deadlock
PHP