PHP Command-Line PHP Parsing Program Arguments - Web Development and Design | Tutorial for Java, PHP, HTML, Javascript PHP Command-Line PHP Parsing Program Arguments - Web Development and Design | Tutorial for Java, PHP, HTML, Javascript

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Tuesday, July 16, 2019

PHP Command-Line PHP Parsing Program Arguments

PHP Command-Line PHP


Parsing Program Arguments

Problem

You want to process arguments passed on the command line.

Solution

Look in $argc for the number of arguments and $argv for their values. The first argument, $argv[0], is the name of script that is being run:

       if ($argc != 2) {
            die("Wrong number of arguments: I expect only 1.");
       }

       $size = filesize($argv[1]);

       print "I am $argv[0] and report that the size of ";
       print "$argv[1] is $size bytes.";

Discussion

Example  Parsing commmand-line arguments

       for ($i = 1; $i < $argc; $i++) {
              switch ($argv[$i]) {
              case '-v':
                   // set a flag
                   $verbose = true;
                   break;
              case '-c':
                   // advance to the next argument
                   $i++;
                   // if it's set, save the value
                   if (isset($argv[$i])) {
                        $config_file = $argv[$i];
                   } else {
                        // quit if no filename specified
                        die("Must specify a filename after -c");
                   }
                   break;
              case '-q':
                   $quiet = true;
                   break;
              default:
                   die('Unknown argument: '.$argv[$i]);
                   break;
              }
       }

In this example, the -v and -q arguments are flags that set $verbose and $quiet, but the -c argument is expected to be followed by a string. This string is assigned to $config_file.

The $argc and $argv variables are concise, but they are not populated if the register_argc_argv config directive is turned off. However, $_SERVER['argc'] and $_SERVER['argv'] always contain the argument count and argument values. Those are good places to look for argument information if you want maximally portable code.

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