phpjs/functions/info/assert_options.js

php.js offers community built php functions in javascript

function assert_options(what, value) {
  //  discuss at: http://phpjs.org/functions/assert_options/
  // original by: Brett Zamir (http://brett-zamir.me)
  //   example 1: assert_options('ASSERT_CALLBACK');
  //   returns 1: null

  // BEGIN REDUNDANT
  this.php_js = this.php_js || {};
  this.php_js.ini = this.php_js.ini || {};
  this.php_js.assert_values = this.php_js.assert_values || {};
  // END REDUNDANT

  var ini, dflt;
  switch (what) {
    case 'ASSERT_ACTIVE':
      ini = 'assert.active';
      dflt = 1;
      break;
    case 'ASSERT_WARNING':
      ini = 'assert.warning';
      dflt = 1;
      throw 'We have not yet implemented warnings for us to throw in JavaScript (assert_options())';
    case 'ASSERT_BAIL':
      ini = 'assert.bail';
      dflt = 0;
      break;
    case 'ASSERT_QUIET_EVAL':
      ini = 'assert.quiet_eval';
      dflt = 0;
      break;
    case 'ASSERT_CALLBACK':
      ini = 'assert.callback';
      dflt = null;
      break;
    default:
      throw 'Improper type for assert_options()';
  }
  // I presume this is to be the most recent value, instead of the default value
  var originalValue = this.php_js.assert_values[ini] || (this.php_js.ini[ini] && this.php_js.ini[ini].local_value) ||
    dflt;

  if (value) {
    this.php_js.assert_values[ini] = value; // We use 'ini' instead of 'what' as key to be more convenient for assert() to test for current value
  }
  return originalValue;
}