$argc — 传递给脚本的参数数目
包含当运行于命令行下时传递给当前脚本的参数的数目。
Note: 脚本的文件名总是作为参数传递给当前脚本，因此 $argc 的最小值为 1。
Note: 这个变量仅在 register_argc_argv 打开时可用。
Example #1 $argc 范例
<?php
var_dump($argc);
?>
当使用这个命令执行: php script.php arg1 arg2 arg3
以上例程的输出类似于：
int(4)
Tejesember (2011-05-04 09:50:39)
To find out are you in CLI or not, this is much better in my opinion:
<?php
if (PHP_SAPI != "cli") {
exit;
}
?>
anonymous (2010-10-21 02:26:47)
I use the following lines to check if i'm using CLI mode or not :
<?php
$cli_mode = false;
if ( isset($_SERVER['argc']) && $_SERVER['argc']>=1 ) {
$cli_mode = true;
}
?>
karsten at typo3 dot org (2009-02-18 00:47:56)
Note: when using CLI $argc (as well as $argv) are always available, regardless of register_argc_argv, as explained at http://docs.php.net/manual/en/features.commandline.php