---
layout: page
title: "JavaScript ftell function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/ftell:806
- /functions/view/ftell
- /functions/view/806
- /functions/ftell:806
- /functions/806
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's ftell

{% codeblock filesystem/ftell.js lang:js https://raw.github.com/kvz/phpjs/master/functions/filesystem/ftell.js raw on github %}
function ftell (handle) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: var h = fopen('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm', 'r');
  // *     example 1: fread(h, 100);
  // *     example 1: ftell(h);
  // *     returns 1: 99

  var getFuncName = function (fn) {
    var name = (/\W*function\s+([\w\$]+)\s*\(/).exec(fn);
    if (!name) {
      return '(Anonymous)';
    }
    return name[1];
  };
  if (!this.php_js || !this.php_js.resourceData || !this.php_js.resourceDataPointer || !handle || !handle.constructor || getFuncName(handle.constructor) !== 'PHPJS_Resource') {
    return false;
  }
  return this.php_js.resourceDataPointer[handle.id] * 2 - 1; // We're currently storing by character, so need to multiply by two; subtract one to appear like array pointer
}
{% endcodeblock %}

 - [view on github](https://github.com/kvz/phpjs/blob/master/functions/filesystem/ftell.js)
 - [edit on github](https://github.com/kvz/phpjs/edit/master/functions/filesystem/ftell.js)

### Example 1
This code
{% codeblock lang:js example %}
var h = fopen('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm', 'r');
fread(h, 100);
ftell(h);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
99
{% endcodeblock %}


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