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function foo ($arg_1, $arg_2,..., $arg_n) {echo "Example function.\n"; return $retval;}
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?php $makefoo = true; /* We can't call foo() from here since it doesn't exist yet, but we can call bar() */ bar(); if ($makefoo) {function foo () {echo "I don't exist until program execution reaches me.\n";}} /* Now we can safely call foo() since $makefoo evaluated to true */ if ($makefoo) foo(); function bar() {{echo "I exist immediately upon program start.\n";}?
=ד 13-2. º¯ʽµĺ¯ʽ
?php function foo() {function bar() {echo "I don't exist until foo() is called.\n";}} /* We can't call bar() yet since it doesn't exist. */ foo(); /* Now we can call bar(), foo()'s processesing has made it accessable. */ bar();?
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include_once()
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