08c03-1.php

介绍PHP5的给类型函数应用

<?php
// Read in all passed parameters and ensure they are correct:
if (!(isset($argc))) {
    // Someone tried to run this through the web.
    echo "This script is for command line use only!";
    exit();
}

// Now check that we have at least 2, and at most 3, parameters:
// Remember that the filename appears as $argv[0] and counts as one.
if (($argc < 3) || ($argc > 4)) {
    // Improper usage, give an error and exit:
    echo "
Improper Usage!  Please use the following:
 {$argv[0]} <regex_to_match> <replacement> [directory]
";
    exit();
}

// Now, if we've made it here, we have a valid number of parameters,
// so store the data into appropriately named variables:
$old = $argv[1];
$new = $argv[2];
// Grab the directory name, default to the current directory if none given
$dir = isset($argv[3]) ? $argv[3] : '.';

// Ensure at this point that the directory exists, otherwise exit
if (!(is_dir($dir))) {
    echo "Error: Directory {$dir} does not exist!\n";
    exit();
}

// Before we get any farther, if the directory string ends in a 
// '/' or '\' then remove it for later use:
$dir_noslash = preg_replace('|([/\\\])$|', '', $dir);

// Now we can begin our filename transformations.  Open the directory:
$d = dir($dir);

// Loop through all the files:
while (false !== ($file = $d->read())) {
    // Skip . and .., we don't want to try to rename them:
    if (($file == '.') || ($file == '..')) { continue; }
    
    // Perform the requested translation of the filename:
    $newname = preg_replace($old, $new, $file);
    
    // Guard against someone passing in regex that breaks:
    if (!(isset($newname))) {
        echo "Error: There has been a problem with the regex provided\n";
        exit();
    }
        
    // Now if this name is now different, then rename the file:
    if ($newname != $file) {
        rename("{$dir_noslash}/{$file}", "{$dir_noslash}/{$newname}");
    }
}
?>