include、include_once与require、require_once区别
2016-09-30 18:09
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include与require的区别include在引入不存文件时产生一个警告且脚本还会继续执行，而require则会导致一个致命性错误且脚本停止执行。<?php include 'no.php'; echo '123';?>如果no.php文件不存在，echo '123'这句是可以继续执行的. <?phprequire 'no.php';echo '123';?>如果no.php文件不存在，echo '123'这句是不执行的，在require时就停止了。 _once只会包含一次，性能有下降，但可以忽略不计。http://stackoverflow.com/questions/2418473/difference-between-require-include-and-include-oncehttp://www.myxzy.com/post-389.html
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