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<?php

class A {
  function __construct () {
  $this->b = new B($this);
  }
  function __destruct () {
  $this->b->__destruct();
  }
}

class B {
  function __construct ($parent = NULL) {
  $this->parent = $parent;
  }
  function __destruct () {
  unset($this->parent);
  }
}

function test(){
for ($i = 0 ; $i < 10000 ; $i++) {
$a = new A();
//$a->__destruct(); // ¿´¿´ÕâÐÐ×¢ÊÍÓë²»×¢ÊÍÓкβ»Í¬
}
}

test();
echo number_format(memory_get_usage());


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phpʱ¼äÕýÔòÎÊÌâ - PHP / »ù´¡±à³Ì

PHP code:

$date = '2009-12-25';
$ptn = '/([\d]{4})[- \/](0?[\d]|1[0-2])[-\/ ](0?[\d]|[1-2][\d]|3[0-1])/';
if (preg_match($ptn,$date,$out))
{
print_r($out);exit();
}
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