phpjs/_octopress/source/functions/strrpos/index.markdown

php.js offers community built php functions in javascript

---
layout: page
title: "JavaScript strrpos function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/strrpos:549
- /functions/view/strrpos
- /functions/view/549
- /functions/strrpos:549
- /functions/549
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's strrpos

{% codeblock strings/strrpos.js lang:js https://raw.github.com/kvz/phpjs/master/functions/strings/strrpos.js raw on github %}
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;
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/strings/strrpos.js)

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are 
the closest match to this hashtable-like data structure. 

Please also note that php.js offers community built functions and goes by the 
[McDonald's Theory](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/strings/strrpos.js)

### Example 1
This code
{% codeblock lang:js example %}
strrpos('Kevin van Zonneveld', 'e');
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
16
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
strrpos('somepage.com', '.', false);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
8
{% endcodeblock %}

### Example 3
This code
{% codeblock lang:js example %}
strrpos('baa', 'a', 3);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
false
{% endcodeblock %}


### Other PHP functions in the strings extension
{% render_partial _includes/custom/strings.html %}