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String Functions
PHP Manual

# strtr

(PHP 4, PHP 5)

strtr — Translate certain characters

### Description

string strtr ( string `$str` , string `$from` , string `$to` )
string strtr ( string `$str` , array `$replace_pairs` )

This function returns a copy of `str` , translating all occurrences of each character in `from` to the corresponding character in `to` .

If `from` and `to` are different lengths, the extra characters in the longer of the two are ignored.

### Parameters

`str`

  The string being translated.

`from`

  The string being translated to `to` .

`to`

  The string replacing `from` .

`replace_pairs`

  The `replace_pairs` parameter may be used as a substitute for `to` and `from` in which case it's an array in the form array('from' => 'to', ...).

### Return Values

This function returns a copy of `str` , translating all occurrences of each character in `from` to the corresponding character in `to` .

### Changelog

Version | Description
--- | ---
4.0.0 | The optional `to` and `from` parameters were added.

### Examples

Example #1 strtr() example

`<?php
$addr = strtr($addr, "äåö", "aao");
?>`

strtr() may be called with only two arguments. If called with two arguments it behaves in a new way: `from` then has to be an array that contains string -> string pairs that will be replaced in the source string. strtr() will always look for the longest possible match first and will *NOT* try to replace stuff that it has already worked on.

Example #2 strtr() example with two arguments

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

The above example will output:

    hello all, I said hi

### See Also

- preg_replace() - Perform a regular expression search and replace

strtoupper
substr_compare
String Functions
PHP Manual