Update docs

Cargo.toml

@@ -18,9 +18,6 @@ cfg-if = "1.0"
 once_cell = "1.17"
 anyhow = { version = "1", optional = true }
 ext-php-rs-derive = { version = "=0.10.0", path = "./crates/macros" }
-tokio = { version = "1", features = ["full"] }
-lazy_static = "1.4.0"
-libc = "*"
 
 [dev-dependencies]
 skeptic = "0.13"

guide/src/SUMMARY.md

@@ -23,6 +23,7 @@
   - [Object](./types/object.md)
   - [Class Object](./types/class_object.md)
   - [Closure](./types/closure.md)
+  - [Functions & methods](./types/functions.md)
 - [Macros](./macros/index.md)
   - [Module](./macros/module.md)
   - [Module Startup Function](./macros/module_startup.md)

guide/src/types/functions.md

@@ -0,0 +1,30 @@
+# Functions & methods
+
+PHP functions and methods are represented by the `Function` struct.  
+
+You can use the `try_from_function` and `try_from_method` methods to obtain a Function struct corresponding to the passed function or static method name.  
+It's heavily recommended you reuse returned `Function` objects, to avoid the overhead of looking up the function/method name.  
+
+You may also use the infallible `from_function` and `from_method` variants, for example when working with native PHP functions/classes that are guaranteed to be always available.
+
+```rust,no_run
+# #![cfg_attr(windows, feature(abi_vectorcall))]
+# extern crate ext_php_rs;
+use ext_php_rs::prelude::*;
+
+use ext_php_rs::zend::Function;
+
+#[php_function]
+pub fn test_function() -> () {
+    let substr = Function::from_function("var_dump");
+    let _ = substr.try_call(vec!["abc"]);
+}
+
+#[php_function]
+pub fn test_method() -> () {
+    let f = Function::from_method("ClassName", "staticMethod");
+    let _ = f.try_call(vec!["abc"]);
+}
+
+# fn main() {}
+```

guide/src/types/object.md

@@ -15,6 +15,26 @@ object.
 
 ## Examples
 
+### Calling a method
+
+```rust,no_run
+# #![cfg_attr(windows, feature(abi_vectorcall))]
+# extern crate ext_php_rs;
+use ext_php_rs::{prelude::*, types::ZendObject};
+
+// Take an object reference and also return it.
+#[php_function]
+pub fn take_obj(obj: &mut ZendObject) -> &mut ZendObject {
+    let res = obj.try_call_method("hello", vec!["arg1", "arg2"]);
+    dbg!(res)
+}
+# #[php_module]
+# pub fn get_module(module: ModuleBuilder) -> ModuleBuilder {
+#     module
+# }
+# fn main() {}
+```
+
 ### Taking an object reference
 
 ```rust,no_run