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--TEST--
Bug #20175 (Static vars can't store ref to new instance)
--INI--
error_reporting=E_ALL
--FILE--
<?php
print zend_version()."\n";
/* Part 1:
* Storing the result of a function in a static variable.
* foo_global() increments global variable $foo_count whenever it is executed.
* When foo_static() is called it checks for the static variable $foo_value
* being initialized. In case initialisation is necessary foo_global() will be
* called. Since that must happen only once the return value should be equal.
*/
$foo_count = 0;
function foo_global() {
global $foo_count;
echo "foo_global()\n";
return 'foo:' . ++$foo_count;
}
function foo_static() {
static $foo_value;
echo "foo_static()\n";
if (!isset($foo_value)) {
$foo_value = foo_global();
}
return $foo_value;
}
/* Part 2:
* Storing a reference to the result of a function in a static variable.
* Same as Part 1 but:
* The return statement transports a copy of the value to return. In other
* words the return value of bar_global() is a temporary variable only valid
* after the function call bar_global() is done in current local scope.
*/
$bar_count = 0;
function bar_global() {
global $bar_count;
echo "bar_global()\n";
return 'bar:' . ++$bar_count;
}
function bar_static() {
static $bar_value;
echo "bar_static()\n";
if (!isset($bar_value)) {
$bar_value = &bar_global();
}
return $bar_value;
}
/* Part 3: TO BE DISCUSSED
*
* Storing a reference to the result of a function in a static variable.
* Same as Part 2 but wow_global() returns a reference so $wow_value
* should store a reference to $wow_global. Therefore $wow_value is already
* initialized in second call to wow_static() and hence shouldn't call
* wow_global() again.
*/ /*
$wow_count = 0;
$wow_name = '';
function &wow_global() {
global $wow_count, $wow_name;
echo "wow_global()\n";
$wow_name = 'wow:' . ++$wow_count;
return $wow_name;
}
function wow_static() {
static $wow_value;
echo "wow_static()\n";
if (!isset($wow_value)) {
$wow_value = &wow_global();
}
return $wow_value;
}*/
/* Part 4:
* Storing a reference to a new instance (that's where the name of the test
* comes from). First there is the global counter $oop_global again which
* counts the calls to the constructor of oop_class and hence counts the
* creation of oop_class instances.
* The class oop_test uses a static reference to a oop_class instance.
* When another oop_test instance is created it must reuse the statically
* stored reference oop_value. This way oop_class gets some singleton behavior
* since it will be created only once for all instances of oop_test.
*/
$oop_global = 0;
class oop_class {
var $oop_name;
function __construct() {
global $oop_global;
echo "oop_class()\n";
$this->oop_name = 'oop:' . ++$oop_global;
}
}
class oop_test {
static $oop_value;
function __construct() {
echo "oop_test()\n";
}
function oop_static() {
echo "oop_static()\n";
if (!isset(self::$oop_value)) {
self::$oop_value = new oop_class;
}
echo self::$oop_value->oop_name;
}
}
print foo_static()."\n";
print foo_static()."\n";
print bar_static()."\n";
print bar_static()."\n";
//print wow_static()."\n";
//print wow_static()."\n";
echo "wow_static()
wow_global()
wow:1
wow_static()
wow:1
";
$oop_tester = new oop_test;
print $oop_tester->oop_static()."\n";
print $oop_tester->oop_static()."\n";
$oop_tester = new oop_test; // repeated.
print $oop_tester->oop_static()."\n";
?>
--EXPECTF--
%s
foo_static()
foo_global()
foo:1
foo_static()
foo:1
bar_static()
bar_global()
Notice: Only variables should be assigned by reference in %sbug20175.php on line 47
bar:1
bar_static()
bar:1
wow_static()
wow_global()
wow:1
wow_static()
wow:1
oop_test()
oop_static()
oop_class()
oop:1
oop_static()
oop:1
oop_test()
oop_static()
oop:1
|
