php - 这个 perl 正则表达式的 PHP 等价物是什么

Question

如何使用 PHP 编写这个 perl 代码？

$var =~ tr/[A-Za-z,.]/[\000-\077]/;

编辑 007 应该是 077

Answer 1

php has the strtr function that uses array key=>value pairs where instances of key in a string are replaced with value. Other than that, like @Rocket said, you can use preg_replace_callback to get your replace value. the matched character is passed in to a function and is replaced with whatever the functions returns.

Answer 2

你可以使用preg_replace_callback Perl

my $var = 'ABCDEFGHIJKLMNOPQRSTUVWXWZabcdefghijklmnopqrstuvwxyz1234567890,.';
$var =~ tr/[A-Za-z,.]/[\000-\077]/;
print unpack("H*", $var), "\n";

PERL 现场演示

PHP

$string = 'ABCDEFGHIJKLMNOPQRSTUVWXWZabcdefghijklmnopqrstuvwxyz1234567890,.';
$replace = preg_replace_callback("/[A-Za-z,.]/", function ($m) {
    $n = 0;
    if (ctype_punct($m[0])) {
        $m[0] == "," and $n = - 8;
        $m[0] == "." and $n = - 7;
    } else {
        $n = ctype_upper($m[0]) ? 65 : 71;
    }
    return chr(ord($m[0]) - $n);
}, $string);
print(bin2hex($replace));

PHP 现场演示

两个输出

000102030405060708090a0b0c0d0e0f101112131415161716191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f30313233313233343536373839303435

Answer 3

有人说 PHP 没有等价物tr///（尽管我现在看到它是 as strtr）。如果是这样，

$var =~ tr/A-Za-z,./\000-\077/;

可以写成如下替代：

my %encode_map;
my $i = 0;
$encode_map{$_} = chr($i++) for 'A'..'Z', 'a'..'z', ',', '.';

$var =~ s/([A-Za-z,.])/$encode_map{$1}/g;

这应该更容易翻译成 PHP，但不幸的是我不知道 PHP。

（我假设[]intr///不应该在那里。）