Actually there's plenty of modules for PHP; many of them are distributed as part of the PHP core. For example, the cURL extension. Compile PHP with the --with-curl option and you get cURL; otherwise you don't.
The difference is that PHP extensions tend to vomit their entire API into the global namespace.
The embedded Perl interpreter for PHP I mentioned earlier is a compiled PHP extension module. It happens to be one that is not bundled with PHP itself, and also a rare example of an object-oriented one, which manages to avoid polluting the global namespace much.
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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