$$ 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

4 votes168 views2 answers
Get permalink by id wordpress
PHP
0 vote222 views1 answer
Laravel Dropzone Attachment Required is not working as expected
PHP Laravel
0 vote202 views1 answer
Php remove characters not numbers or letters
PHP
-1 vote170 views2 answers
Php how to connect to db using PDO
PHP
5 votes191 views2 answers
Check session in blade laravel
PHP Laravel
0 vote162 views1 answer
Get the matched value from 2 array in php
PHP
7 votes194 views1 answer
Eloquent run seeder
PHP
1 vote203 views1 answer
How to get current location in laravel
PHP Laravel
0 vote206 views1 answer
Get datetime of excel cell in codeigniter
PHP CodeIgniter
0 vote184 views1 answer
Laravel role
PHP Laravel