Add ability to show PHP warnings (etc)

I don't believe there's a way for extensions to trigger PHP notices or warnings currently. This is done using the `php_error_docref` function. I've placed a function in `ext_php_rs::php_error()` however, there might be a better place?

allowed_bindings.rs

@@ -46,6 +46,7 @@ bind! {
     // ext_php_rs_is_kown_valid_utf8,
     // ext_php_rs_set_kown_valid_utf8,
     object_properties_init,
+    php_error_docref,
     php_info_print_table_end,
     php_info_print_table_header,
     php_info_print_table_row,
@@ -113,6 +114,21 @@ bind! {
     CONST_DEPRECATED,
     CONST_NO_FILE_CACHE,
     CONST_PERSISTENT,
+    E_ERROR,
+    E_WARNING,
+    E_PARSE,
+    E_NOTICE,
+    E_CORE_ERROR,
+    E_CORE_WARNING,
+    E_COMPILE_ERROR,
+    E_COMPILE_WARNING,
+    E_USER_ERROR,
+    E_USER_WARNING,
+    E_USER_NOTICE,
+    E_STRICT,
+    E_RECOVERABLE_ERROR,
+    E_DEPRECATED,
+    E_USER_DEPRECATED,
     HT_MIN_SIZE,
     IS_ARRAY,
     IS_ARRAY_EX,

docsrs_bindings.rs

@@ -31,6 +31,21 @@ pub const IS_OBJECT_EX: u32 = 776;
 pub const IS_RESOURCE_EX: u32 = 265;
 pub const IS_REFERENCE_EX: u32 = 266;
 pub const IS_CONSTANT_AST_EX: u32 = 267;
+pub const E_ERROR: u32 = 1;
+pub const E_WARNING: u32 = 2;
+pub const E_PARSE: u32 = 4;
+pub const E_NOTICE: u32 = 8;
+pub const E_CORE_ERROR: u32 = 16;
+pub const E_CORE_WARNING: u32 = 32;
+pub const E_COMPILE_ERROR: u32 = 64;
+pub const E_COMPILE_WARNING: u32 = 128;
+pub const E_USER_ERROR: u32 = 256;
+pub const E_USER_WARNING: u32 = 512;
+pub const E_USER_NOTICE: u32 = 1024;
+pub const E_STRICT: u32 = 2048;
+pub const E_RECOVERABLE_ERROR: u32 = 4096;
+pub const E_DEPRECATED: u32 = 8192;
+pub const E_USER_DEPRECATED: u32 = 16384;
 pub const ZEND_PROPERTY_ISSET: u32 = 0;
 pub const ZEND_PROPERTY_EXISTS: u32 = 2;
 pub const ZEND_ACC_PUBLIC: u32 = 1;
@@ -1329,6 +1344,14 @@ extern "C" {
 extern "C" {
     pub fn php_printf(format: *const ::std::os::raw::c_char, ...) -> usize;
 }
+extern "C" {
+    pub fn php_error_docref(
+        docref: *const ::std::os::raw::c_char,
+        type_: ::std::os::raw::c_int,
+        format: *const ::std::os::raw::c_char,
+        ...
+    );
+}
 #[repr(C)]
 #[derive(Debug, Copy, Clone)]
 pub struct _zend_ini_entry {

src/error.rs

@@ -1,11 +1,16 @@
 //! Error and result types returned from the library functions.
 
-use std::{error::Error as ErrorTrait, ffi::NulError, fmt::Display};
+use std::{
+    error::Error as ErrorTrait,
+    ffi::{CString, NulError},
+    fmt::Display,
+};
 
 use crate::{
     boxed::ZBox,
     exception::PhpException,
-    flags::{ClassFlags, DataType, ZvalTypeFlags},
+    ffi::php_error_docref,
+    flags::{ClassFlags, DataType, ErrorType, ZvalTypeFlags},
     types::ZendObject,
 };
 
@@ -108,3 +113,18 @@ impl From<Error> for PhpException {
         Self::default(err.to_string())
     }
 }
+
+/// Trigger an error that is reported in PHP the same way `trigger_error()` is.
+///
+/// See specific error type descriptions at https://www.php.net/manual/en/errorfunc.constants.php.
+///
+pub fn php_error(type_: ErrorType, message: &str) {
+    let c_string = match CString::new(message) {
+        Ok(string) => string,
+        Err(_) => {
+            return ();
+        }
+    };
+
+    unsafe { php_error_docref(std::ptr::null(), type_.bits() as _, c_string.as_ptr()) }
+}

src/flags.rs

@@ -5,14 +5,16 @@ use bitflags::bitflags;
 #[cfg(not(php82))]
 use crate::ffi::ZEND_ACC_REUSE_GET_ITERATOR;
 use crate::ffi::{
-    CONST_CS, CONST_DEPRECATED, CONST_NO_FILE_CACHE, CONST_PERSISTENT, IS_ARRAY, IS_CALLABLE,
-    IS_CONSTANT_AST, IS_DOUBLE, IS_FALSE, IS_LONG, IS_MIXED, IS_NULL, IS_OBJECT, IS_PTR,
-    IS_REFERENCE, IS_RESOURCE, IS_STRING, IS_TRUE, IS_TYPE_COLLECTABLE, IS_TYPE_REFCOUNTED,
-    IS_UNDEF, IS_VOID, ZEND_ACC_ABSTRACT, ZEND_ACC_ANON_CLASS, ZEND_ACC_CALL_VIA_TRAMPOLINE,
-    ZEND_ACC_CHANGED, ZEND_ACC_CLOSURE, ZEND_ACC_CONSTANTS_UPDATED, ZEND_ACC_CTOR,
-    ZEND_ACC_DEPRECATED, ZEND_ACC_DONE_PASS_TWO, ZEND_ACC_EARLY_BINDING, ZEND_ACC_FAKE_CLOSURE,
-    ZEND_ACC_FINAL, ZEND_ACC_GENERATOR, ZEND_ACC_HAS_FINALLY_BLOCK, ZEND_ACC_HAS_RETURN_TYPE,
-    ZEND_ACC_HAS_TYPE_HINTS, ZEND_ACC_HEAP_RT_CACHE, ZEND_ACC_IMMUTABLE,
+    CONST_CS, CONST_DEPRECATED, CONST_NO_FILE_CACHE, CONST_PERSISTENT, E_COMPILE_ERROR,
+    E_COMPILE_WARNING, E_CORE_ERROR, E_CORE_WARNING, E_DEPRECATED, E_ERROR, E_NOTICE, E_PARSE,
+    E_RECOVERABLE_ERROR, E_STRICT, E_USER_DEPRECATED, E_USER_ERROR, E_USER_NOTICE, E_USER_WARNING,
+    E_WARNING, IS_ARRAY, IS_CALLABLE, IS_CONSTANT_AST, IS_DOUBLE, IS_FALSE, IS_LONG, IS_MIXED,
+    IS_NULL, IS_OBJECT, IS_PTR, IS_REFERENCE, IS_RESOURCE, IS_STRING, IS_TRUE, IS_TYPE_COLLECTABLE,
+    IS_TYPE_REFCOUNTED, IS_UNDEF, IS_VOID, ZEND_ACC_ABSTRACT, ZEND_ACC_ANON_CLASS,
+    ZEND_ACC_CALL_VIA_TRAMPOLINE, ZEND_ACC_CHANGED, ZEND_ACC_CLOSURE, ZEND_ACC_CONSTANTS_UPDATED,
+    ZEND_ACC_CTOR, ZEND_ACC_DEPRECATED, ZEND_ACC_DONE_PASS_TWO, ZEND_ACC_EARLY_BINDING,
+    ZEND_ACC_FAKE_CLOSURE, ZEND_ACC_FINAL, ZEND_ACC_GENERATOR, ZEND_ACC_HAS_FINALLY_BLOCK,
+    ZEND_ACC_HAS_RETURN_TYPE, ZEND_ACC_HAS_TYPE_HINTS, ZEND_ACC_HEAP_RT_CACHE, ZEND_ACC_IMMUTABLE,
     ZEND_ACC_IMPLICIT_ABSTRACT_CLASS, ZEND_ACC_INTERFACE, ZEND_ACC_LINKED, ZEND_ACC_NEARLY_LINKED,
     ZEND_ACC_NEVER_CACHE, ZEND_ACC_NO_DYNAMIC_PROPERTIES, ZEND_ACC_PRELOADED, ZEND_ACC_PRIVATE,
     ZEND_ACC_PROMOTED, ZEND_ACC_PROTECTED, ZEND_ACC_PUBLIC, ZEND_ACC_RESOLVED_INTERFACES,
@@ -164,6 +166,27 @@ bitflags! {
     }
 }
 
+bitflags! {
+    /// Represents error types when used via php_error_docref for example.
+    pub struct ErrorType: u32 {
+        const Error = E_ERROR;
+        const Warning = E_WARNING;
+        const Parse = E_PARSE;
+        const Notice = E_NOTICE;
+        const CoreError = E_CORE_ERROR;
+        const CoreWarning = E_CORE_WARNING;
+        const CompileError = E_COMPILE_ERROR;
+        const CompileWarning = E_COMPILE_WARNING;
+        const UserError = E_USER_ERROR;
+        const UserWarning = E_USER_WARNING;
+        const UserNotice = E_USER_NOTICE;
+        const Strict = E_STRICT;
+        const RecoverableError = E_RECOVERABLE_ERROR;
+        const Deprecated = E_DEPRECATED;
+        const UserDeprecated = E_USER_DEPRECATED;
+    }
+}
+
 /// Valid data types for PHP.
 #[repr(C, u8)]
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]