1--TEST-- 2Bug #20175 (Static vars can't store ref to new instance) 3--INI-- 4error_reporting=E_ALL 5--FILE-- 6<?php 7print zend_version()."\n"; 8 9/* Part 1: 10 * Storing the result of a function in a static variable. 11 * foo_global() increments global variable $foo_count whenever it is executed. 12 * When foo_static() is called it checks for the static variable $foo_value 13 * being initialised. In case initialisation is necessary foo_global() will be 14 * called. Since that must happen only once the return value should be equal. 15 */ 16$foo_count = 0; 17 18function foo_global() { 19 global $foo_count; 20 echo "foo_global()\n"; 21 return 'foo:' . ++$foo_count; 22} 23 24function foo_static() { 25 static $foo_value; 26 echo "foo_static()\n"; 27 if (!isset($foo_value)) { 28 $foo_value = foo_global(); 29 } 30 return $foo_value; 31} 32 33/* Part 2: 34 * Storing a reference to the result of a function in a static variable. 35 * Same as Part 1 but: 36 * The return statement transports a copy of the value to return. In other 37 * words the return value of bar_global() is a temporary variable only valid 38 * after the function call bar_global() is done in current local scope. 39 */ 40$bar_count = 0; 41 42function bar_global() { 43 global $bar_count; 44 echo "bar_global()\n"; 45 return 'bar:' . ++$bar_count; 46} 47 48function bar_static() { 49 static $bar_value; 50 echo "bar_static()\n"; 51 if (!isset($bar_value)) { 52 $bar_value = &bar_global(); 53 } 54 return $bar_value; 55} 56 57/* Part 3: TO BE DISCUSSED 58 * 59 * Storing a reference to the result of a function in a static variable. 60 * Same as Part 2 but wow_global() returns a reference so $wow_value 61 * should store a reference to $wow_global. Therefor $wow_value is already 62 * initialised in second call to wow_static() and hence shouldn't call 63 * wow_global() again. 64 */ /* 65$wow_count = 0; 66$wow_name = ''; 67 68function &wow_global() { 69 global $wow_count, $wow_name; 70 echo "wow_global()\n"; 71 $wow_name = 'wow:' . ++$wow_count; 72 return $wow_name; 73} 74 75function wow_static() { 76 static $wow_value; 77 echo "wow_static()\n"; 78 if (!isset($wow_value)) { 79 $wow_value = &wow_global(); 80 } 81 return $wow_value; 82}*/ 83 84/* Part 4: 85 * Storing a reference to a new instance (that's where the name of the test 86 * comes from). First there is the global counter $oop_global again which 87 * counts the calls to the constructor of oop_class and hence counts the 88 * creation of oop_class instances. 89 * The class oop_test uses a static reference to a oop_class instance. 90 * When another oop_test instance is created it must reuse the statically 91 * stored reference oop_value. This way oop_class gets some singleton behavior 92 * since it will be created only once for all insatnces of oop_test. 93 */ 94$oop_global = 0; 95class oop_class { 96 var $oop_name; 97 98 function __construct() { 99 global $oop_global; 100 echo "oop_class()\n"; 101 $this->oop_name = 'oop:' . ++$oop_global; 102 } 103} 104 105class oop_test { 106 static $oop_value; 107 108 function __construct() { 109 echo "oop_test()\n"; 110 } 111 112 function oop_static() { 113 echo "oop_static()\n"; 114 if (!isset(self::$oop_value)) { 115 self::$oop_value = new oop_class; 116 } 117 echo self::$oop_value->oop_name; 118 } 119} 120 121print foo_static()."\n"; 122print foo_static()."\n"; 123print bar_static()."\n"; 124print bar_static()."\n"; 125//print wow_static()."\n"; 126//print wow_static()."\n"; 127echo "wow_static() 128wow_global() 129wow:1 130wow_static() 131wow:1 132"; 133$oop_tester = new oop_test; 134print $oop_tester->oop_static()."\n"; 135print $oop_tester->oop_static()."\n"; 136$oop_tester = new oop_test; // repeated. 137print $oop_tester->oop_static()."\n"; 138?> 139--EXPECTF-- 140%s 141foo_static() 142foo_global() 143foo:1 144foo_static() 145foo:1 146bar_static() 147bar_global() 148 149Notice: Only variables should be assigned by reference in %sbug20175.php on line 47 150bar:1 151bar_static() 152bar:1 153wow_static() 154wow_global() 155wow:1 156wow_static() 157wow:1 158oop_test() 159oop_static() 160oop_class() 161oop:1 162oop_static() 163oop:1 164oop_test() 165oop_static() 166oop:1 167
