Replace multiple characters with multiple replacers [duplicate]

Question

I have many calls like this throughout the code, escaping any backticks on the columns of a row.

htmlentities(str_replace("`", "``", $row['column']), ENT_QUOTES);

I made an addition, requiring the column to replace a #width ##. Since most of these calls happen inline an output, I would like to have a solution in a single line.

I was thinking conditional regex (preg_replace_callback), but is this the best way to achieve that? So what I need is: replace backticks with 2 backticks, and replace hashes with 2 hashes. (This is for escaping purposes).

Remember that you can single line everything by making a function do the work for you. — h2ooooooo
– h2ooooooo, Commented Sep 1, 2014 at 7:33

BlitZ · Accepted Answer · 2014-09-01 07:29:15Z

4

str_replace() supports array parameters:

// translation map:
$map = [
    '`' => '``',
    '#' => '##'
];

// what to replace:
$from = array_keys($map);

// replace by what:
$to   = array_values($map);

echo htmlentities(str_replace($from, $to, $row['column']), ENT_QUOTES);

In rare cases, that requires you to minify your code, you may try to use that:

echo htmlentities(str_replace([ '`', '#' ], [ '``', '##' ], $row['column']), ENT_QUOTES));
//                            ^             ^
//                        from what     by what

edited Sep 1, 2014 at 7:29

answered Sep 1, 2014 at 7:17

BlitZ

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12 Comments

George G Over a year ago

he said in single row :p

BlitZ Over a year ago

@GeorgeGarchagudashvili I believe it would be not readable, so I strongly suggest to write readable code.

George G Over a year ago

Sometimes there comes situation you need just a single row, not wasting things for unreadable 'readable'

BlitZ Over a year ago

@GeorgeGarchagudashvili sometimes. However, it might be "good" to think about future readers not to cry by blood, by "deminifying" source codes or templates.

Johannes Over a year ago

While I agree, that this would be the proper way of making readable code, it's not applicable with the code I have. There are a lot of those calls throughout the code, and I just needed a replacement-string for my IDE.

|

Justinas · Accepted Answer · 2014-09-01 07:18:35Z

3

As stated in documentation of str_replace, you can use can use arrays:

str_replace(["`", "#"], ["``", "##"], $row['column']);

answered Sep 1, 2014 at 7:18

Justinas

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Comments

Aprillion · Accepted Answer · 2014-09-01 08:48:46Z

3

if someone would prefer to use a regular expression:

preg_replace("/`|#/", "$0$0")

answered Sep 1, 2014 at 8:48

Aprillion

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George G · Accepted Answer · 2014-09-01 07:17:52Z

2

It's easy, just use arrays as params for str_replace

htmlentities(str_replace(array("`","#"), array("``","##"), $row['column']), ENT_QUOTES);

answered Sep 1, 2014 at 7:17

George G

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