Think about the L() function in PHP. What is its main function? It feels like it is rarely used?

$rules = array(
array('verify','require',L('VERIFY_CODE_MUST')), array('name','',L('ACCOUNT_EXISTS'),0,'unique',1), );

L('VERIFY_CODE_MUST')//The L function called here, what is the use of the L function?

Reply content:

$rules = array(
array('verify','require',L('VERIFY_CODE_MUST')), array('name','',L('ACCOUNT_EXISTS'),0,'unique',1), );

L('VERIFY_CODE_MUST')//The L function called here, what is the use of the L function?

Get and set language definition;
You can view the source code to learn more;

I feel that it is rarely used because domestic projects are developed using thinkphp;
There are not many multi-language supports;

One more thing; if you are not developing a website that requires multiple languages, it is indeed rarely used;