$$ 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 vote328 views2 answers
How to trim string in laravel
PHP
0 vote324 views1 answer
Activerecord yii2 select with limit(start,end) not working
PHP
2 votes322 views2 answers
Laravel date default now
PHP
98 votes368 views6 answers
Php check if string contains
PHP
3 votes308 views1 answer
Php proper function comments
PHP
4 votes321 views2 answers
Php array to console
PHP
0 vote335 views1 answer
Laravel 8 logout 419 page expired
PHP Laravel
4 votes323 views2 answers
Php add to existing associative array
PHP
1 vote300 views2 answers
Laravel make directory
PHP
9 votes302 views5 answers
Return view with variable laravel
PHP