PHP how to replace multiple strings

Question

I am beginner in php, and i have problems with replace & explode

I want to replace strings using ":" all strings is unknown!

input :

string1:string2:string3:string4:
have:a:good:day:
link1:link2:link3:link4:

output :

string1:string2:newString:string4:
have:a:newString1:day:
link1:link2:newString3:link4:

Where do the replacements come from? Are you always replacing the third field, or are you replacing specific words? — Barmar
– Barmar, Commented Jun 28, 2017 at 22:45

AlienHoboken · Accepted Answer · 2017-06-28 22:07:25Z

1

I think you're looking for the explode and implode functions. You can do something like this which breaks your string into an array, you can modify the array elements, then combine them back into a string.

$str = "have:a:good:day:";

$tokens = explode(":", $str);
//$tokens => ["have", "a", "good", "day", ""]

$tokens[2] = "newString1";
//$tokens => ["have", "a", "newString1", "day", ""]

$str2 = implode(":", $tokens);
//$str2 => "have:a:good:day:"

Alternatively if you just want to replace certain words in the string, you can use the str_replace function to replace one word with another. Eg.

$str = "have:a:good:day:";
$str2 = str_replace("good", "newString1", $str);
//$str2 => "have:a:newString1:day:";

answered Jun 28, 2017 at 22:07

AlienHoboken

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4 Comments

unalignedmemoryaccess Over a year ago

Why would somebody use implode and explode for string replace?

AlienHoboken Over a year ago

He asked about explode. Could be that he wants to replace element N, not replace based on text. I expanded my answer to cover both cases, though.

unalignedmemoryaccess Over a year ago

But he didn't about implode and this code is just overkill for that simple task. If so, show him real solution with string replace and array tokens.

AlienHoboken Over a year ago

You're assuming you know the use case is just to replace one string value with another, it was not clear from the question so I covered that approach as well if they want to do a replace based on the element's "position" in the string. If you are not happy with my answer I cannot help you. There are two "real" solutions in my answer. EDIT: From the OP's edit to their post, it appears this was the correct approach, where the strings are unknown.

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