While I like SplWeekRef and the somewhat proposed SplWeekRefList, you’ll
find attached a patch that exposes a simple function „refcount“ having
this signature:
int refcount(mixed value)
So if you would like to play around with it, have fun. It would be
interesting to see if there are any other use cases besides destroying a
reference.
An idea for a userland implementation of SplWeekRefList with auto cleanup:
let SplWeekRefList register a ticket function which executes cleanup with
a certain propability. Something along the lines of this:
<?php
declare(ticks=1);
class WeekRefList extends SplObjectStorage
{
public function __construct()
{
register_tick_function(array($this, 'cleanup'));
}
public function cleanup()
{
if (rand(1, 10) === 1) {
foreach ($this as $entry) {
// First ref is in ObjectStorage, second is $entry var
if (refcount($entry) === 2) {
unset($this[$entry]);
}
}
}
}
}
With regards,
Lars
Am 18.07.11 10:28 schrieb "Lars Schultz" unter <lars.schu...@toolpark.com>:
>Am 18.07.2011 10:15, schrieb Ferenc Kovacs:
>> I think that having to know and care about refcounts and zvals are
>> more complicated than having an Spl class, which can hold a reference
>> for a variable what can be destroyed to free memory.
>> and there is a chance that people are familiar with the Weak
>> references from other languages, while the zval approach only familiar
>> for those that knows about php internals.
>> so I think that from the userland POV, weak references are easier to
>>grasp.
>
>You're right for users who indeed have this problem. But I am worried
>about those users, which do not have the problem, but still have to know
>what WeakReferences are...but I should wait for the RFC.
>
>
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>
Index: Zend/zend_builtin_functions.c
===================================================================
--- Zend/zend_builtin_functions.c (revision 313122)
+++ Zend/zend_builtin_functions.c (working copy)
@@ -94,6 +94,7 @@
static ZEND_FUNCTION(gc_enabled);
static ZEND_FUNCTION(gc_enable);
static ZEND_FUNCTION(gc_disable);
+static ZEND_FUNCTION(refcount);
/* {{{ arginfo */
ZEND_BEGIN_ARG_INFO(arginfo_zend__void, 0)
@@ -237,6 +238,10 @@
ZEND_BEGIN_ARG_INFO_EX(arginfo_extension_loaded, 0, 0, 1)
ZEND_ARG_INFO(0, extension_name)
ZEND_END_ARG_INFO()
+
+ZEND_BEGIN_ARG_INFO_EX(arginfo_refcount, 0, 0, 0)
+ ZEND_ARG_INFO(0, object)
+ZEND_END_ARG_INFO()
/* }}} */
static const zend_function_entry builtin_functions[] = { /* {{{ */
@@ -306,6 +311,7 @@
ZEND_FE(gc_enabled, arginfo_zend__void)
ZEND_FE(gc_enable, arginfo_zend__void)
ZEND_FE(gc_disable, arginfo_zend__void)
+ ZEND_FE(refcount, arginfo_refcount)
{ NULL, NULL, NULL }
};
/* }}} */
@@ -385,6 +391,19 @@
}
/* }}} */
+/* {{{ proto int refcount(mixed value)
+ Returns the refcount for the passed object */
+ZEND_FUNCTION(refcount)
+{
+ zval *value;
+
+ if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &value) ==
FAILURE) {
+ return;
+ }
+
+ RETURN_LONG(Z_REFCOUNT_P(value) - 1);
+}
+
/* {{{ proto int func_num_args(void)
Get the number of arguments that were passed to the function */
ZEND_FUNCTION(func_num_args)
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