Description:
------------
It looks like strtr function replaces strings in the following order:

1) first occurences first,
2) longest keys first.

I don't think it's a bad thing, but it doesn't work as documented. Here's the quation from the official docs:

"The longest keys will be tried first"

So, it's either a documentation problem or a bug.


Test script:
---------------
<?php

// expecting 'bcde' to be replaced first
echo strtr('abcdef', ['abc'=> '1', 'bcde'=> '2']) . "\n";

// the following two are replaced as expected, just to give more info
echo strtr('abcdef', ['a'=> '2', 'abc'=> '1']) . "\n";
echo strtr('abcdef', ['abcd'=> '2', 'abc'=> '1']) . "\n";


Expected result:
----------------
a2f
1def
2ef


Actual result:
--------------
1def
1def
2ef