这个Perl脚本的PHP等价物是什么

这里有一些解释。这是用于将任意javascript代码转换为适用于bookmarklet的代码。

#!/usr/bin/env perl
#
# http://daringfireball.net/2007/03/javascript_bookmarklet_builder
# Licence: http://www.opensource.org/licenses/mit-license.php
use strict;
use warnings;
use URI::Escape qw(uri_escape_utf8);
use open  IO  => ":utf8",       # UTF8 by default
          ":std";               # Apply to STDIN/STDOUT/STDERR
my $src = do { local $/; <> };
# Zap the first line if there's already a bookmarklet comment:
$src =~ s{^// ?javascript:.+'n}{};
my $bookmarklet = $src;
for ($bookmarklet) {
    s{^'s*//.+'n}{}gm;  # Kill comments.
    s{'t}{ }gm;         # Tabs to spaces
    s{[ ]{2,}}{ }gm;    # Space runs to one space
    s{^'s+}{}gm;        # Kill line-leading whitespace
    s{'s+$}{}gm;        # Kill line-ending whitespace
    s{'n}{}gm;          # Kill newlines
}
# Escape single- and double-quotes, spaces, control chars, unicode:
$bookmarklet = "javascript:" .
    uri_escape_utf8($bookmarklet, qq('" 'x00-'x1f'x7f-'xff));
print "// $bookmarklet'n" . $src;
# Put bookmarklet on clipboard:
`/bin/echo -n '$bookmarklet' | /usr/bin/pbcopy`;