I'm looking for a simple way to find matching portions of two strings in PHP (specifically in the context of a URI)

For example, consider the two strings:



What I need is to chop off the matching portion of these two strings from the second string, resulting in:


before appending the first string as a prefix, forming an absolute URI.

Is there some simple way (in PHP) to compare two arbitrary strings for matching substrings within them?

EDIT: as pointed out, I meant the longest matching substring common to both strings


What are the criteria here? Because technically, the h in "http" will match the h in "machinehost". You're going to have to be a lot more specific than "matching substrings."

Written by cdhowie

Sorry, you're totally right. I meant matching the longest possible substring.

Written by ubermensch

Accepted Answer

This would be the answer. Ready-to-use PHP function.

Written by Jon
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