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<?php $makefoo = true; /* 我们不能在处调用foo()函数， 因为它还不存在，但可以调用bar()函数。*/ bar(); if ($makefoo) { function foo() { echo "I don't exist until program execution reaches me.\n"; } } /* 现在我们可以安全调用函数 foo()了， 因为 $makefoo 值为真 */ if ($makefoo) foo(); function bar() { echo "I exist immediately upon program start.\n"; } ?>
Output for git.master, git.master_jit, rfc.property-hooks
I exist immediately upon program start. I don't exist until program execution reaches me.

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