replace some corresponding letters from a string 1

[xbl12]

Hi;

I got a string(myString)which will be replaced some letter. and also i got another two of string, one is fromlatter="asdfghjkl.."
, and another one is tolatter="olik90=ky...", the two strings of the fromlatter and to latter are same length, the length may be more than
200.

And i want to if myString has a letter a will change to o, s=>l, d=>i, f=>k .. and so on.


Could anyone tell me how to do that, please.

 

[Ferrian]

Do you know exactly which letters will be changed, or does it depend on the situation? The changes you show here seem a bit random...

The basic concept of replacing is:

str_replace("a","o",mystring);

You could create an array of the letters to change from and to and then loop through it... but that's probably not the best way.

 

[jpadie]

in fact you do not need to loop through arrays. you can do this instead

$search = array('a', 'e', 'i', 'o', 'u');
$replace = array('z', 'y', 'x', 'w', 'v');
$text = ($search, $replace, $mystring);

but be careful with this as the replacements are done sequentially and so if the z were replaced with an 'e', you would find that all 'a' and 'e' become 'y'. If this is a potential issue then strtr() is a better bet.

 

[Ferrian]

Does the final line not require a command to initiate the three items to interact?

I did not realise you could replace arrays of items, very useful.

 

[Ferrian]

Oh, it's just clicked what you're asking, you want the two strings to convert from the first string to the second string, like some kind of code cipher creater?

I have no idea how that could be done, but I misunderstood you so I feel I need to get it back on track so someone else can help you!

 

[xbl12]

>Do you know exactly which letters will be changed, or does >it depend on the situation?

yes, i do. it is same as following;
$search = array('a', 'e', 'i', 'o', 'u');
$replace = array('z', 'y', 'x', 'w', 'v');


Thanks for your help.

 

[xbl12]

Hi jpadie;

The both are works, but you prefer strtr than the another one, it is more safe , is it right?

 

[jpadie]

sorry. the last line of my code should have had a function prepended. In this case str_replace.

@xbl12: in most cases I think that strtr() is 'safer'. However there may well be times when you want the behaviour of str_replace. it's horses for courses.