php 中可使用命令行变量。太多文字太抽象，用脚本来说话：
运行脚本时，命令行为：php argvtest.php TQ TQx
则输出结果为：
TQ TQx $argv是一个数组3 注意$argc变量，它用来保存$argv数组里元素的个数。要比正常输入的多一个，打印出来才知道，是多了一个脚本文件名称Array ( [0] => argvtest.php [1] => TQ [2] => TQx ) array(3) { [0]=> string(12) "argvtest.php" [1]=> string(2) "TQ" [2]=> string(3) "TQx" }
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