phpjs
Version:
27 lines (26 loc) • 976 B
JavaScript
function strrpos(haystack, needle, offset) {
// From: http://phpjs.org/functions
// + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// + bugfixed by: Onno Marsman
// + input by: saulius
// + bugfixed by: Brett Zamir (http://brett-zamir.me)
// * example 1: strrpos('Kevin van Zonneveld', 'e');
// * returns 1: 16
// * example 2: strrpos('somepage.com', '.', false);
// * returns 2: 8
// * example 3: strrpos('baa', 'a', 3);
// * returns 3: false
// * example 4: strrpos('baa', 'a', 2);
// * returns 4: 2
var i = -1;
if (offset) {
i = (haystack + '').slice(offset).lastIndexOf(needle); // strrpos' offset indicates starting point of range till end,
// while lastIndexOf's optional 2nd argument indicates ending point of range from the beginning
if (i !== -1) {
i += offset;
}
} else {
i = (haystack + '').lastIndexOf(needle);
}
return i >= 0 ? i : false;
}