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ircmaxell/gist:1966809

Created March 3, 2012 16:03
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Scalar Casting Patch, Version 3
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gistfile1.diff
Index: Zend/zend.h
===================================================================
--- Zend/zend.h (revision 323850)
+++ Zend/zend.h (working copy)
@@ -486,6 +486,10 @@
union _zend_function *__call;
union _zend_function *__callstatic;
union _zend_function *__tostring;
+ union _zend_function *__toint;
+ union _zend_function *__tofloat;
+ union _zend_function *__toarray;
+ union _zend_function *__toscalar;
union _zend_function *serialize_func;
union _zend_function *unserialize_func;
Index: Zend/zend_object_handlers.c
===================================================================
--- Zend/zend_object_handlers.c (revision 323850)
+++ Zend/zend_object_handlers.c (working copy)
@@ -1482,6 +1482,49 @@
}
/* }}} */
+ZEND_API int zend_std_cast_object(zval *readobj, zval *writeobj, int type TSRMLS_DC) /* {{{ */
+{
+ zend_class_entry *ce = Z_OBJCE_P(readobj);
+ zval *retval = NULL;
+ switch (type) {
+ case IS_LONG:
+ if (ce->__toint) {
+ zend_call_method_with_0_params(&readobj, ce, &ce->__toint, "__toint", &retval);
+ }
+ break;
+ case IS_DOUBLE:
+ if (ce->__tofloat) {
+ zend_call_method_with_0_params(&readobj, ce, &ce->__tofloat, "__tofloat", &retval);
+ }
+ break;
+ case IS_ARRAY:
+ if (ce->__toarray) {
+ zend_call_method_with_0_params(&readobj, ce, &ce->__toarray, "__toarray", &retval);
+ }
+ break;
+ }
+ if (retval) {
+ ZVAL_ZVAL(writeobj, retval, 1, 1);
+ return SUCCESS;
+ }
+ return zend_std_cast_object_tostring(readobj, writeobj, type TSRMLS_CC);
+
+}
+/* }}} */
+
+ZEND_API zval *zend_std_cast_object_get(zval *readobj TSRMLS_DC) /* {{{ */
+{
+ zval *retval;
+ zend_class_entry *ce = Z_OBJCE_P(readobj);
+ ALLOC_INIT_ZVAL(retval);
+ if (ce->__toscalar && zend_call_method_with_0_params(&readobj, ce, &ce->__toscalar, "__toscalar", &retval)) {
+ return retval;
+ }
+ ZVAL_NULL(retval);
+ return retval;
+}
+/* }}} */
+
ZEND_API int zend_std_cast_object_tostring(zval *readobj, zval *writeobj, int type TSRMLS_DC) /* {{{ */
{
zval *retval;
@@ -1589,7 +1632,7 @@
zend_std_read_dimension, /* read_dimension */
zend_std_write_dimension, /* write_dimension */
zend_std_get_property_ptr_ptr, /* get_property_ptr_ptr */
- NULL, /* get */
+ zend_std_cast_object_get, /* get */
NULL, /* set */
zend_std_has_property, /* has_property */
zend_std_unset_property, /* unset_property */
@@ -1602,7 +1645,7 @@
zend_std_object_get_class, /* get_class_entry */
zend_std_object_get_class_name, /* get_class_name */
zend_std_compare_objects, /* compare_objects */
- zend_std_cast_object_tostring, /* cast_object */
+ zend_std_cast_object, /* cast_object */
NULL, /* count_elements */
NULL, /* get_debug_info */
zend_std_get_closure, /* get_closure */
Index: Zend/zend_compile.c
===================================================================
--- Zend/zend_compile.c (revision 323850)
+++ Zend/zend_compile.c (working copy)
@@ -1617,6 +1617,22 @@
if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
zend_error(E_WARNING, "The magic method __toString() must have public visibility and cannot be static");
}
+ } else if ((name_len == sizeof(ZEND_TOINT_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOINT_FUNC_NAME, sizeof(ZEND_TOINT_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toInt() must have public visibility and cannot be static");
+ }
+ } else if ((name_len == sizeof(ZEND_TOFLOAT_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOFLOAT_FUNC_NAME, sizeof(ZEND_TOFLOAT_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toFloat() must have public visibility and cannot be static");
+ }
+ } else if ((name_len == sizeof(ZEND_TOARRAY_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOARRAY_FUNC_NAME, sizeof(ZEND_TOARRAY_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toArray() must have public visibility and cannot be static");
+ }
+ } else if ((name_len == sizeof(ZEND_TOSCALAR_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOSCALAR_FUNC_NAME, sizeof(ZEND_TOSCALAR_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toScalar() must have public visibility and cannot be static");
+ }
}
} else {
char *class_lcname;
@@ -1673,6 +1689,26 @@
zend_error(E_WARNING, "The magic method __toString() must have public visibility and cannot be static");
}
CG(active_class_entry)->__tostring = (zend_function *) CG(active_op_array);
+ } else if ((name_len == sizeof(ZEND_TOINT_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOINT_FUNC_NAME, sizeof(ZEND_TOINT_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toInt() must have public visibility and cannot be static");
+ }
+ CG(active_class_entry)->__toint = (zend_function *) CG(active_op_array);
+ } else if ((name_len == sizeof(ZEND_TOFLOAT_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOFLOAT_FUNC_NAME, sizeof(ZEND_TOFLOAT_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toFloat() must have public visibility and cannot be static");
+ }
+ CG(active_class_entry)->__tofloat = (zend_function *) CG(active_op_array);
+ } else if ((name_len == sizeof(ZEND_TOARRAY_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOARRAY_FUNC_NAME, sizeof(ZEND_TOARRAY_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toArray() must have public visibility and cannot be static");
+ }
+ CG(active_class_entry)->__toarray = (zend_function *) CG(active_op_array);
+ } else if ((name_len == sizeof(ZEND_TOSCALAR_FUNC_NAME)-1) && (!memcmp(lcname, ZEND_TOSCALAR_FUNC_NAME, sizeof(ZEND_TOSCALAR_FUNC_NAME)-1))) {
+ if (fn_flags & ((ZEND_ACC_PPP_MASK | ZEND_ACC_STATIC) ^ ZEND_ACC_PUBLIC)) {
+ zend_error(E_WARNING, "The magic method __toScalar() must have public visibility and cannot be static");
+ }
+ CG(active_class_entry)->__toscalar = (zend_function *) CG(active_op_array);
} else if (!(fn_flags & ZEND_ACC_STATIC)) {
CG(active_op_array)->fn_flags |= ZEND_ACC_ALLOW_STATIC;
}
@@ -2839,6 +2875,18 @@
if (!ce->__tostring) {
ce->__tostring = ce->parent->__tostring;
}
+ if (!ce->__toint) {
+ ce->__toint = ce->parent->__toint;
+ }
+ if (!ce->__tofloat) {
+ ce->__tofloat = ce->parent->__tofloat;
+ }
+ if (!ce->__toarray) {
+ ce->__toarray = ce->parent->__toarray;
+ }
+ if (!ce->__toscalar) {
+ ce->__toscalar = ce->parent->__toscalar;
+ }
if (!ce->clone) {
ce->clone = ce->parent->clone;
}
@@ -3734,6 +3782,14 @@
ce->__callstatic = fe;
} else if (!strncmp(mname, ZEND_TOSTRING_FUNC_NAME, mname_len)) {
ce->__tostring = fe;
+ } else if (!strncmp(mname, ZEND_TOINT_FUNC_NAME, mname_len)) {
+ ce->__toint = fe;
+ } else if (!strncmp(mname, ZEND_TOFLOAT_FUNC_NAME, mname_len)) {
+ ce->__tofloat = fe;
+ } else if (!strncmp(mname, ZEND_TOARRAY_FUNC_NAME, mname_len)) {
+ ce->__toarray = fe;
+ } else if (!strncmp(mname, ZEND_TOSCALAR_FUNC_NAME, mname_len)) {
+ ce->__toscalar = fe;
} else if (ce->name_length + 1 == mname_len) {
char *lowercase_name = emalloc(ce->name_length + 1);
zend_str_tolower_copy(lowercase_name, ce->name, ce->name_length);
@@ -6742,6 +6798,10 @@
ce->__call = NULL;
ce->__callstatic = NULL;
ce->__tostring = NULL;
+ ce->__toint = NULL;
+ ce->__tofloat = NULL;
+ ce->__toarray = NULL;
+ ce->__toscalar = NULL;
ce->create_object = NULL;
ce->get_iterator = NULL;
ce->iterator_funcs.funcs = NULL;
Index: Zend/zend_object_handlers.h
===================================================================
--- Zend/zend_object_handlers.h (revision 323850)
+++ Zend/zend_object_handlers.h (working copy)
@@ -154,6 +154,8 @@
ZEND_API struct _zend_property_info *zend_get_property_info(zend_class_entry *ce, zval *member, int silent TSRMLS_DC);
ZEND_API HashTable *zend_std_get_properties(zval *object TSRMLS_DC);
ZEND_API HashTable *zend_std_get_debug_info(zval *object, int *is_temp TSRMLS_DC);
+ZEND_API zval *zend_std_cast_object_get(zval *readobj TSRMLS_DC);
+ZEND_API int zend_std_cast_object(zval *readobj, zval *writeobj, int type TSRMLS_DC);
ZEND_API int zend_std_cast_object_tostring(zval *readobj, zval *writeobj, int type TSRMLS_DC);
ZEND_API void zend_std_write_property(zval *object, zval *member, zval *value, const struct _zend_literal *key TSRMLS_DC);
ZEND_API void rebuild_object_properties(zend_object *zobj);
Index: Zend/zend_compile.h
===================================================================
--- Zend/zend_compile.h (revision 323850)
+++ Zend/zend_compile.h (working copy)
@@ -829,6 +829,10 @@
#define ZEND_CALL_FUNC_NAME "__call"
#define ZEND_CALLSTATIC_FUNC_NAME "__callstatic"
#define ZEND_TOSTRING_FUNC_NAME "__tostring"
+#define ZEND_TOINT_FUNC_NAME "__toint"
+#define ZEND_TOFLOAT_FUNC_NAME "__tofloat"
+#define ZEND_TOARRAY_FUNC_NAME "__toarray"
+#define ZEND_TOSCALAR_FUNC_NAME "__toscalar"
#define ZEND_AUTOLOAD_FUNC_NAME "__autoload"
/* The following constants may be combined in CG(compiler_options)
Index: Zend/zend_API.c
===================================================================
--- Zend/zend_API.c (revision 323850)
+++ Zend/zend_API.c (working copy)
@@ -27,6 +27,7 @@
#include "zend_constants.h"
#include "zend_exceptions.h"
#include "zend_closures.h"
+#include "zend_interfaces.h"
#ifdef HAVE_STDARG_H
#include <stdarg.h>
@@ -368,9 +369,25 @@
convert_to_long_ex(arg);
*p = Z_LVAL_PP(arg);
break;
-
+ case IS_OBJECT:
+ {
+ zend_class_entry *ce = Z_OBJCE_PP(arg);
+ zval *tmp = NULL;
+ if (ce->__toint) {
+ if (Z_ISREF_PP(arg)) {
+ zend_spprintf(error, 0, "to be an int, cannot cast referenced parameter from object");
+ return "long";
+ }
+ zend_call_method_with_0_params(arg, ce, &ce->__toint, "__toint", &tmp);
+ if (tmp && Z_TYPE_P(tmp) == IS_LONG) {
+ *p = Z_LVAL_P(tmp);
+ zval_ptr_dtor(&tmp);
+ break;
+ }
+ }
+ }
+ /* Fall through intentional */
case IS_ARRAY:
- case IS_OBJECT:
case IS_RESOURCE:
default:
return "long";
@@ -402,9 +419,25 @@
convert_to_double_ex(arg);
*p = Z_DVAL_PP(arg);
break;
-
+ case IS_OBJECT:
+ {
+ zend_class_entry *ce = Z_OBJCE_PP(arg);
+ zval *tmp = NULL;
+ if (ce->__tofloat) {
+ if (Z_ISREF_PP(arg)) {
+ zend_spprintf(error, 0, "to be a float, cannot cast referenced parameter from object");
+ return "double";
+ }
+ zend_call_method_with_0_params(arg, ce, &ce->__tofloat, "__tofloat", &tmp);
+ if (tmp && Z_TYPE_P(tmp) == IS_DOUBLE) {
+ *p = Z_DVAL_P(tmp);
+ zval_ptr_dtor(&tmp);
+ break;
+ }
+ }
+ }
+ /* Fall through intentional */
case IS_ARRAY:
- case IS_OBJECT:
case IS_RESOURCE:
default:
return "double";
@@ -506,6 +539,23 @@
}
if (Z_TYPE_PP(arg) == IS_ARRAY || (c == 'A' && Z_TYPE_PP(arg) == IS_OBJECT)) {
*p = *arg;
+ } else if (Z_TYPE_PP(arg) == IS_OBJECT) {
+ zend_class_entry *ce = Z_OBJCE_PP(arg);
+ zval *tmp = NULL;
+ if (ce->__toarray) {
+ if (Z_ISREF_PP(arg)) {
+ zend_spprintf(error, 0, "to be an array, cannot cast referenced parameter from object");
+ return "array";
+ }
+ zend_call_method_with_0_params(arg, ce, &ce->__toarray, "__toarray", &tmp);
+ if (tmp && Z_TYPE_P(tmp) == IS_ARRAY) {
+ SEPARATE_ZVAL_IF_NOT_REF(arg);
+ ZVAL_ZVAL(*arg, tmp, 1, 1) ;
+ *p = *arg;
+ break;
+ }
+ }
+ return "array";
} else {
return "array";
}
@@ -526,6 +576,19 @@
if(*p == NULL) {
return "array";
}
+ } else if (Z_TYPE_PP(arg) == IS_OBJECT) {
+ zend_class_entry *ce = Z_OBJCE_PP(arg);
+ zval *tmp = NULL;
+ if (ce->__toarray) {
+ zend_call_method_with_0_params(arg, ce, &ce->__toarray, "__toarray", &tmp);
+ if (tmp && Z_TYPE_P(tmp) == IS_ARRAY) {
+ SEPARATE_ZVAL_IF_NOT_REF(arg);
+ ZVAL_ZVAL(*arg, tmp, 1, 1);
+ *p = HASH_OF(*arg);
+ break;
+ }
+ }
+ return "array";
} else {
return "array";
}
@@ -1930,7 +1993,7 @@
int count=0, unload=0, result=0;
HashTable *target_function_table = function_table;
int error_type;
- zend_function *ctor = NULL, *dtor = NULL, *clone = NULL, *__get = NULL, *__set = NULL, *__unset = NULL, *__isset = NULL, *__call = NULL, *__callstatic = NULL, *__tostring = NULL;
+ zend_function *ctor = NULL, *dtor = NULL, *clone = NULL, *__get = NULL, *__set = NULL, *__unset = NULL, *__isset = NULL, *__call = NULL, *__callstatic = NULL, *__tostring = NULL, *__toint = NULL, *__tofloat = NULL, *__toarray = NULL, *__toscalar = NULL;
const char *lowercase_name;
int fname_len;
const char *lc_class_name = NULL;
@@ -2065,6 +2128,14 @@
__callstatic = reg_function;
} else if ((fname_len == sizeof(ZEND_TOSTRING_FUNC_NAME)-1) && !memcmp(lowercase_name, ZEND_TOSTRING_FUNC_NAME, sizeof(ZEND_TOSTRING_FUNC_NAME))) {
__tostring = reg_function;
+ } else if ((fname_len == sizeof(ZEND_TOINT_FUNC_NAME)-1) && !memcmp(lowercase_name, ZEND_TOINT_FUNC_NAME, sizeof(ZEND_TOINT_FUNC_NAME))) {
+ __toint = reg_function;
+ } else if ((fname_len == sizeof(ZEND_TOFLOAT_FUNC_NAME)-1) && !memcmp(lowercase_name, ZEND_TOFLOAT_FUNC_NAME, sizeof(ZEND_TOFLOAT_FUNC_NAME))) {
+ __tofloat = reg_function;
+ } else if ((fname_len == sizeof(ZEND_TOARRAY_FUNC_NAME)-1) && !memcmp(lowercase_name, ZEND_TOARRAY_FUNC_NAME, sizeof(ZEND_TOARRAY_FUNC_NAME))) {
+ __toarray = reg_function;
+ } else if ((fname_len == sizeof(ZEND_TOSCALAR_FUNC_NAME)-1) && !memcmp(lowercase_name, ZEND_TOSCALAR_FUNC_NAME, sizeof(ZEND_TOSCALAR_FUNC_NAME))) {
+ __toscalar = reg_function;
} else if ((fname_len == sizeof(ZEND_GET_FUNC_NAME)-1) && !memcmp(lowercase_name, ZEND_GET_FUNC_NAME, sizeof(ZEND_GET_FUNC_NAME))) {
__get = reg_function;
} else if ((fname_len == sizeof(ZEND_SET_FUNC_NAME)-1) && !memcmp(lowercase_name, ZEND_SET_FUNC_NAME, sizeof(ZEND_SET_FUNC_NAME))) {
@@ -2107,6 +2178,10 @@
scope->__call = __call;
scope->__callstatic = __callstatic;
scope->__tostring = __tostring;
+ scope->__toint = __toint;
+ scope->__tofloat = __tofloat;
+ scope->__toarray = __toarray;
+ scope->__toscalar = __toscalar;
scope->__get = __get;
scope->__set = __set;
scope->__unset = __unset;
@@ -2150,6 +2225,30 @@
}
__tostring->common.fn_flags &= ~ZEND_ACC_ALLOW_STATIC;
}
+ if (__toint) {
+ if (__toint->common.fn_flags & ZEND_ACC_STATIC) {
+ zend_error(error_type, "Method %s::%s() cannot be static", scope->name, __toint->common.function_name);
+ }
+ __toint->common.fn_flags &= ~ZEND_ACC_ALLOW_STATIC;
+ }
+ if (__tofloat) {
+ if (__tofloat->common.fn_flags & ZEND_ACC_STATIC) {
+ zend_error(error_type, "Method %s::%s() cannot be static", scope->name, __tofloat->common.function_name);
+ }
+ __tofloat->common.fn_flags &= ~ZEND_ACC_ALLOW_STATIC;
+ }
+ if (__toarray) {
+ if (__toarray->common.fn_flags & ZEND_ACC_STATIC) {
+ zend_error(error_type, "Method %s::%s() cannot be static", scope->name, __toarray->common.function_name);
+ }
+ __toarray->common.fn_flags &= ~ZEND_ACC_ALLOW_STATIC;
+ }
+ if (__toscalar) {
+ if (__toscalar->common.fn_flags & ZEND_ACC_STATIC) {
+ zend_error(error_type, "Method %s::%s() cannot be static", scope->name, __toscalar->common.function_name);
+ }
+ __toscalar->common.fn_flags &= ~ZEND_ACC_ALLOW_STATIC;
+ }
if (__get) {
if (__get->common.fn_flags & ZEND_ACC_STATIC) {
zend_error(error_type, "Method %s::%s() cannot be static", scope->name, __get->common.function_name);
Index: Zend/zend_operators.c
===================================================================
--- Zend/zend_operators.c (revision 323850)
+++ Zend/zend_operators.c (working copy)
@@ -30,6 +30,7 @@
#include "zend_strtod.h"
#include "zend_exceptions.h"
#include "zend_closures.h"
+#include "zend_interfaces.h"
#if ZEND_USE_TOLOWER_L
#include <locale.h>
@@ -640,6 +641,7 @@
case IS_OBJECT:
{
zval *tmp;
+ zend_class_entry *ce = Z_OBJCE_P(op);
HashTable *ht;
ALLOC_HASHTABLE(ht);
@@ -651,6 +653,15 @@
FREE_HASHTABLE(ht);
return;
}
+ } else if (ce->__toarray) {
+ zend_call_method_with_0_params(&op, ce, &ce->__toarray, "__toarray", &tmp);
+ if (tmp && Z_TYPE_P(tmp) == IS_ARRAY) {
+ ZVAL_ZVAL(op, tmp, 1, 1);
+ zend_hash_destroy(ht);
+ FREE_HASHTABLE(ht);
+ return;
+ }
+ zend_error(E_WARNING, "%s::__toArray() must return an array", ce->name);
} else if (Z_OBJ_HT_P(op)->get_properties) {
HashTable *obj_ht = Z_OBJ_HT_P(op)->get_properties(op TSRMLS_CC);
if (obj_ht) {
Index: Zend/zend_API.h
===================================================================
--- Zend/zend_API.h (revision 323850)
+++ Zend/zend_API.h (working copy)
@@ -186,6 +186,10 @@
class_container.__call = handle_fcall; \
class_container.__callstatic = NULL; \
class_container.__tostring = NULL; \
+ class_container.__toint = NULL; \
+ class_container.__tofloat = NULL; \
+ class_container.__toarray = NULL; \
+ class_container.__toscalar = NULL; \
class_container.__get = handle_propget; \
class_container.__set = handle_propset; \
class_container.__unset = handle_propunset; \
@dotnull
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dotnull commented Jan 4, 2019

Cool for now, but i'm also interested in __toBool and a __toClass or __toObject magic to perform object-to-object casts, something like:

class A {
  public $test = '';
  public __construct($test) {
    $this->test = $test;
  }
  function someFunction() {
    echo $this->test;
  }
}
class B {
  protected $test = '123';
  function __toObject($class) {
    // it is possible to convert to A
    if ($class == 'A') {
      return new A($this->test, $this);
    }
    // throw an error
  }
}
$b = new $B;
$a = (A) $b;
echo $a->test; // should be 123
$x = ((A) $b)->someFunction(); // should also be 123

Same should be possible for parameters in functions/methods like:

public function _(Photo $i) // Implies that $i must be object of class Photo
public function _((Photo) $i) // Implies that $i can be converted to an Photo and must therefor be convertable

I think much more sexy is using angle brackets, in my opinien... See:

$a = <A> $b;
$x = (<A> $b)->someFunction();
public function _(<Photo> $i);

@daniert
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daniert commented May 16, 2020

I'm interested in this too. I think it is the perfect moment for this to be included in PHP core.

@olleharstedt
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olleharstedt commented Jul 20, 2021 •
edited
Loading

Why would you choose a separate function for each class instead of a more general __toType(string $type)?

@kripper
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kripper commented Apr 29, 2024

Please release.

When doing $obj + 123, $obj shouldn't be treated as a string. Adding __toscalar is handy for solving this.

@kripper
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kripper commented Apr 29, 2024

I created php/php-src#14073
Please vote.

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