$$ 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

0 vote228 views1 answer
Location php ini mac os
PHP
1 vote214 views4 answers
Generate random color php
PHP
19 votes207 views6 answers
Laravel Route Group
PHP
0 vote248 views1 answer
Php storm can't write
PHP
0 vote212 views1 answer
Laravel env asset_url
PHP
0 vote207 views1 answer
Drupal 9 Get taxonomy term objects by vocabulary machine name vid
PHP
4 votes190 views3 answers
How to hide .php in url
PHP
0 vote214 views1 answer
Mamp change php version
PHP
0 vote200 views1 answer
Encode string for csv
PHP
1 vote324 views1 answer
Symfony convert entity to array
PHP Symfony