The
require() statement includes and evaluates the
specific file.
require() includes and evaluates a specific file.
Detailed information on how this inclusion works is described
in the documentation for include().
require() and include() are identical in every way
except how they handle failure. include()
produces a
Warning while require() results in a
Fatal Error. In
other words, don't hesitate to use require()
if you want a missing file to halt processing of the page.
include() does not behave this way, the script will
continue regardless. Be sure to have an appropriate
include_path setting as well.
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See the include() documentation for more
examples.
注: Prior to PHP 4.0.2, the following applies: require() will always attempt to read the target file, even if the line it's on never executes. The conditional statement won't affect require(). However, if the line on which the require() occurs is not executed, neither will any of the code in the target file be executed. Similarly, looping structures do not affect the behaviour of require(). Although the code contained in the target file is still subject to the loop, the require() itself happens only once.
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See also include(),
require_once(),
include_once(), eval(), file(),
readfile(), virtual() and
include_path.