从PHP7开始,单个use语句可用于从同一名称空间导入类,函数和常量,而不是多个use语句.
<?php // Before PHP 7 use com\IT屋\ClassA; use com\IT屋\ClassB; use com\IT屋\ClassC as C; use function com\IT屋\fn_a; use function com\IT屋\fn_b; use function com\IT屋\fn_c; use const com\IT屋\ConstA; use const com\IT屋\ConstB; use const com\IT屋\ConstC; // PHP 7+ code use com\IT屋\{ClassA, ClassB, ClassC as C}; use function com\IT屋\{fn_a, fn_b, fn_c}; use const com\IT屋\{ConstA, ConstB, ConstC}; ?>