CODEWITHSUNDEEP
phpsymfonynamespaces
will
will

Reputation: 91

Why add namespace into inner function in php?

In Symfony, some functions have a root namespace and some functiona do not, why?

For example: 

// code from symfony 
if (file_exists($cache->getPath()) && \is_object($this->container = include $cache->getPath())) {
     $this->container->set('kernel', $this);
     $oldContainer = $this->container;
     $fresh = true;
 }

file_exists does not have a namespace, but \is_object does.

I've noticed that this sort of difference occurs throughout the whole Symfony project.

Upvotes: 4

Views: 349

Answers (1)

VaaChar
VaaChar

Reputation: 688

This could most likely be to get the performance improvements that were introduced to some functions in PHP 7.0 where some functions where replaced by opcodes. In order to get these improvements these functions have to be referenced to by the root namespace.

This issue on the PHP-CS-Fixer GitHub repository includes a comment with a list of functions that use this. file_exists has not been improved in this manner so it will yield no performance improvement to reference it by the root namespace. This issue was also referenced many times by PRs for the Symfony GitHub repository.

Here is a link to the PHP source code where you can also find the list of functions with this behaviour.

Upvotes: 2

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