Online PHP editor | output for 0sU7o

<?php class a{ function __construct(){ echo 'class a __construct'."\n"; } function a1(){ echo 'a1'."\n"; } function a2(){ echo 'a2'."\n"; } function a3(){ echo 'a3'."\n"; } } class b{ protected $cache; function __construct(){ echo 'class b __construct'."\n"; } function b1($tags='tags'){ return new a(); } function b2($tags='tags'){ static $cache=[]; if(isset($cache[$tags])) return $cache[$tags]; return $cache[$tags]=new a(); } function b3($tags='tags'){ if(isset($this->cache[$tags])) return $this->cache[$tags]; return $this->cache[$tags]=new a(); } } /*内存计算*/ $start = memory_get_usage(); $b=new b(); $b->b1()->a1(); $b->b1()->a2(); $b->b1()->a3(); /*内存计算*/ $end = memory_get_usage(); echo '内存'.($end-$start)."\n"; /*内存计算*/ $start = memory_get_usage(); $b=new b(); $b->b2()->a1(); $b->b2()->a2(); $b->b2()->a3(); /*内存计算*/ $end = memory_get_usage(); echo '内存'.($end-$start)."\n"; /*内存计算*/ $start = memory_get_usage(); $b=new b(); $b->b3()->a1(); $b->b3()->a2(); $b->b3()->a3(); /*内存计算*/ $end = memory_get_usage(); echo '内存'.($end-$start)."\n";