PHP中include、include_once、require、require_once四者区别
2014-03-14 15:13
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include是包含,如果程序执行到这行没有找到文件会警告.但继续执行.include_once和include是一样的
只是如果包含的文件已经存在就不再包含
.require是引用资源.如果资源文件没有找到.程序会致命错误并且终止执行
.require_once的意思和require是一样的,只是会检验文件是否已经被包含.
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