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function assert_options (what, value) {
    // Set/get the various assert flags  
    // 
    // version: 909.322
    // 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;
}

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assert_options('ASSERT_CALLBACK');

1

null