How to split a string into an array, but rather chain new elements instead of adding an element per delimiter in php?

Question

I know how to do that with a loop obviously, but I wonder if there was a one line for turning this:

a/b/c/d

into

[a, a/b, a/b/c, a/b/c/d]

acobster · Accepted Answer · 2016-06-06 18:35:51Z

3

Not a one-liner exactly, but you can do this with array_reduce:

$arr = array_reduce(explode('/', 'a/b/c/d'), function($accumulator, $char) {
    $prev = empty($accumulator) ? '' : $accumulator[count($accumulator)-1] . '/';
    $accumulator[] = $prev.$char;
    return $accumulator;
}, []);

edited Jun 6, 2016 at 18:35

answered Jun 6, 2016 at 16:50

acobster

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2 Comments

Alex Over a year ago

this returns aababcabcd which is correct for the original question, but I need to include the /s, so $accumulator[] = $prev . $char . '/'; seems right but it also adds an / to the end. any idea?

acobster Over a year ago

In that case you want to define $prev as having a trailing slash, if it's not empty. See edited answer.

Jeff Puckett · Accepted Answer · 2016-06-06 17:41:24Z

0

has a semi-colon in the closure, so I guess it's technically a two-liner

echo json_encode(array_map(function($val,&$accumulator){return $accumulator=$accumulator.$val; },explode('/','a/b/c/d'),array()));

Results in this:

["a","ab","abc","abcd"]

edited Jun 6, 2016 at 17:41

answered Jun 6, 2016 at 16:31

Jeff Puckett

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