$argc — The number of arguments passed to script
Contains the number of arguments passed to the current script when running from the command line.
Note: The script's filename is always passed as an argument to the script, therefore the minimum value of $argc is 1.
Note: This variable is only available when register_argc_argv is enabled.
Example #1 $argc example
<?php
var_dump($argc);
?>
When executing the example with: php script.php arg1 arg2 arg3
上例的输出类似于：
int(4)