phpjs/experimental/stream/stream_get_line.js

php.js offers community built php functions in javascript

function stream_get_line(handle, length, ending) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: fopen('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm', 'r');
  // *     example 1: stream_get_line(handle, 2);
  // *     returns 1: '<'
  var start = 0,
      fullline = '';

  if (!this.php_js || !this.php_js.resourceData || !this.php_js.resourceDataPointer || length !== undefined && !length) {
    return false;
  }

  start = this.php_js.resourceDataPointer[handle.id];

  if (start === undefined || !this.php_js.resourceData[handle.id][start]) {
    return false; // Resource was already closed or already reached the end of the file
  }

  // Fix: Should we also test for /\r\n?|\n/?
  fullline = this.php_js.resourceData[handle.id].slice(start, this.php_js.resourceData[handle.id].indexOf(ending, start) + 1);
  if (fullline === '') {
    fullline = this.php_js.resourceData[handle.id].slice(start); // Get to rest of the file
  }

  length = (length === undefined || fullline.length < length) ? fullline.length : Math.floor(length / 2) || 1; // two bytes per character (or surrogate), but ensure at least one
  this.php_js.resourceDataPointer[handle.id] += length;
  return this.php_js.resourceData[handle.id].substr(start, length - (fullline && ending && ending.length ? ending.length : 0));
}