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26 lines
638 B
26 lines
638 B
<?php
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/**
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* php的全局变量到函数里不能用，在函数里需要关键字global引用
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*/
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$a=1;
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$b=3;
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function func()
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{
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global $a; //使用global引入全局变量
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echo "a：$a".PHP_EOL; //func内使用global引用了a和b，所以c没有打印出来
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echo "b：$b".PHP_EOL;
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}
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//$GLOBALS['var']
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function func2()
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{
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echo "a:".$GLOBALS['a'].PHP_EOL; // $GLOBALS['var'] 指的是函数外部变量本身，是一个变量.在程序的任意位置都能使用
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echo "b:".$GLOBALS['b'].PHP_EOL;
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}
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func();
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func2();
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?>
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