The printinstruction emits the argument to standard output (stdout), and concat implements string concatenation.
print 指令发出标准输出(stdout)的参数,且 concat 实现字符串连接。
2
In this case, the more succinct printinstruction merely indicates that there is a many-valued property called works, but does not expand the property.
在本例中,print指令更为简洁,仅指出存在一个名为works的多值属性,而未展开此属性。
3
The PHP printinstruction on this object, incidentally, produces the same information as var_dump in a slightly more compact form, all on one line (which we have split into five for readability).