1.php的單例模式
2.include,require區(qū)別
加載時(shí)間谦去，錯(cuò)誤處理
3.spl_autoload_register和autoload自動(dòng)加載的兩種方式
function __autoload($classname){
$filename = "./class/".$classname.".class.php";
if(is_file($filename)){
include $filename;
}
}
function loadclass($classname){
$filename = "./class/".$classname.".class.php";
if(is_file($filename)){
include $filename;
}
}
// spl_autoload_register()函數(shù)讓這個(gè)loadclass具備了自動(dòng)加載類的功能
spl_autoload_register("loadclass");
4.array_merge和array_merge_recursive和array_combine
