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    <p>Since we've had several answers, I decided to test them all and benchmark them. I used this paths to test:</p> <p><code>$from = "/var/www/sites/web/mainroot/webapp/folder/sub/subf/subfo/subfol/subfold/lastfolder/";</code> NOTE: if it is a folder, you have to put a trailing slash for functions to work correctly! So, <code>__DIR__</code> will not work. Use <code>__FILE__</code> instead or <code>__DIR__ . '/'</code></p> <p><code>$to = "/var/www/sites/web/mainroot/webapp/folder/aaa/bbb/ccc/ddd";</code></p> <p><strong>RESULTS: (decimal separator is comma, thousand separator is dot)</strong></p> <ul> <li>Function by Gordon: result <strong>CORRECT</strong>, time for 100.000 execs <strong>1,222</strong> seconds</li> <li>Function by Young: result <strong>CORRECT</strong>, time for 100.000 execs <strong>1,540</strong> seconds</li> <li>Function by Ceagle: result <strong>WRONG</strong> (it works with some paths but fails with some others, like the ones used in the tests and written above)</li> <li>Function by Loranger: result <strong>WRONG</strong> (it works with some paths but fails with some others, like the ones used in the tests and written above)</li> </ul> <p><strong>So, I suggest that you use Gordon's implementation! (the one marked as answer)</strong></p> <p>Young's one is good too and performs better with simple directory structures (like "a/b/c.php"), while Gordon's one performs better with complex structures, with lots of subdirectories (like the ones used in this benchmark).</p> <hr> <p>NOTE: I write here below the results returned with <code>$from</code> and <code>$to</code> as inputs, so you can verify that 2 of them are OK, while other 2 are wrong:</p> <ul> <li>Gordon: <code>../../../../../../aaa/bbb/ccc/ddd</code> --> CORRECT</li> <li>Young: <code>../../../../../../aaa/bbb/ccc/ddd</code> --> CORRECT</li> <li>Ceagle: <code>../../../../../../bbb/ccc/ddd</code> --> WRONG</li> <li>Loranger: <code>../../../../../aaa/bbb/ccc/ddd</code> --> WRONG</li> </ul>
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    1. CONice benchmark. You did test against folders instead of files (as requested), that's the reason why my function failed to return the correct path. Anyway, you're right, in order to be reliable this function should always return the correct path, regardless it uses files or folders, so I did simply fix this issue. I would be curious to get my results. Could you please benchmark another time ?
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