How to replace 2 strings (with eachother) simultaneously in PHP

Question

What I'm trying to do is very simple, but I'm looking to do it most efficiently, preferably using php builtin fns.

$str = '1234';
echo replace_function(array('1','3'),array('3','1'),$str);

// output: 3214

str_replace,preg_replace would result in 1214, which means it goes through the arrays, replacing matched strings. I'm looking for a solution to simultaneously "switch" these two (or more) strings.

any ideas?

Sergei · Accepted Answer · 2010-02-18 02:00:59Z

6

You need string translate: http://php.net/manual/en/function.strtr.php

<?php
$trans = array("hello" => "hi", "hi" => "hello");
echo strtr("hi all, I said hello", $trans);
// = hello all, I said hi
?>

answered Feb 18, 2010 at 2:00

Sergei

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3 Comments

Doug Neiner Over a year ago

@Sergi, +1, but be sure to credit where you got the example from, and 2, its always nice to give an example that uses the OP's code.

Kzqai Over a year ago

Just watch out for false positives.

Gal Over a year ago

I knew there oughtta be something simple like that. Thank you so much!

Box · Accepted Answer · 2010-02-18 01:56:06Z

-2

<?php

$subject = '1234';
$result = preg_replace('/(1)(2)(3)(4)/si', '$3$2$1$4', $subject);
var_dump($result);

?>

You can change the pattern to something more generic, such as '/(\d)(\d)(\d)(\d)/'.

answered Feb 18, 2010 at 1:56

Box

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4 Comments

Gal Over a year ago

that's not what I'm looking for. I don't know the sequence of the replaced string. Something arbitrary like 3211123 should seamlessly become 1233321.

Jake Over a year ago

That will only work on the specific case of '1235' you might as well say $result = '3214' Using '/(\d)(\d)(\d)(\d)/' will change any 4 digits to '3214'

Box Over a year ago

Pity to get "-2" rather than "Thanks". Glad to know strtr().

Box Over a year ago

<?php $subject = "hi all, I said hello"; $result = preg_replace('/(hi)(.+)(hello)/si', '$3$2$1', $subject); var_dump($result); ?>

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