PHP to rust FFI example

php-to-rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "php-to-rust"
+version = "0.1.0"
+authors = ["Nicolas Far <nicofff@gmail.com>"]
+
+[lib]
+name = "double_input"
+crate-type = ["dylib"]

php-to-rust/Makefile

@@ -0,0 +1,14 @@
+ifeq ($(shell uname),Darwin)
+    EXT := dylib
+else
+    EXT := so
+endif
+
+all: target/debug/libdouble_input.$(EXT)
+	php src/ffi.php
+
+target/debug/libdouble_input.$(EXT): src/lib.rs Cargo.toml
+	cargo build
+
+clean:
+	rm -rf target

php-to-rust/README.md

@@ -0,0 +1,5 @@
+PHP 7.4 is needed
+
+At time of writing, that means [compiling from source](https://github.com/php/php-src#building-php-source-code). 
+
+Make sure to pass --with-ffi as a parameter to ./configure

php-to-rust/src/ffi.php

@@ -0,0 +1,9 @@
+<?php
+
+$libExtension = (PHP_OS_FAMILY == "Darwin" ? 'dylib' : 'so');
+
+$ffi = FFI::cdef(
+    "int32_t double_input(int32_t input);",
+    "target/debug/libdouble_input.$libExtension");
+var_dump($ffi->double_input(3));
+?>

php-to-rust/src/lib.rs

@@ -0,0 +1,5 @@
+#[no_mangle]
+pub extern fn double_input(input: i32) -> i32 {
+    input * 2
+}
+