php global usage

<code>aa.php
<span><span><?php</span><span>global</span><span>$a</span>;
    <span>require</span>(<span>'./b.php'</span>);
    <span>echo</span><span>"a ---:$a\n"</span>;

b.php
<span><?php</span><span>$a</span> = <span>123</span>;
php aa.php
输出结果：a ---:<span>123</span>
去掉aa.php 里面的glocal <span>$a</span>
php aa.php
输出结果是 a --:
</span></code>

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The above introduces the usage of php global, including global and php content. I hope it will be helpful to friends who are interested in PHP tutorials.