fluffos/docs/efun/strings/implode.md
Yucong Sun c914f03d66
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Co-authored-by: Claude <noreply@anthropic.com>
2026-07-09 22:09:55 -04:00

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Markdown

---
title: strings / implode
---
# implode
### NAME
implode() - concatenate strings
### SYNOPSIS
string implode( mixed *arr, string del );
mixed implode( mixed *arr, function f, void | mixed extra );
### DESCRIPTION
In the first form, concatenate all strings found in array 'arr', with
the string 'del' between each element. Only strings are used from the
array; elements that are not strings are ignored.
In the second form, when the second argument is a function, implode()
instead reduces the array: it combines the elements left to right by
repeatedly calling 'f' with the running result and the next element
(a fold), and returns whatever the final call returns. The optional
'extra' argument, when present, is used as the starting value.
### RETURN VALUE
The joined string for the delimiter form, or the accumulated value
(any type) for the function form.
### SEE ALSO
explode(3), sprintf(3), filter(3), map(3)