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function trigger_error (error_msg, error_type) {
    // Generates a user-level error/warning/notice message  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/trigger_error    // +   original by: Brett Zamir (http://brett-zamir.me)
    // %        note 1: Although this function should only allow the E_USER_ types, we'll allow the
    // %        note 1: others here in order to be able to simulate more types (though should not trigger
    // %        note 1: aggregates like E_STRICT or E_ALL).
    // %        note 1: See also our experimental at() function (to mimic the @ error suppressor)    // -    depends on: echo
    // *     example 1: trigger_error('This will just be a notice');
    // *     returns 1: true
    // Fix: get to work with set_error_handler()'s handler when that is added
     var type = 0,
        i = 0,
        that = this,
        prepend = '',
        append = '';    if (!error_type) {
        error_type = 'E_USER_NOTICE';
    }
    var ini_on = function (ini) {
        return that.php_js.ini[ini] && that.php_js.ini[ini].local_value && ((that.php_js.ini[ini].local_value.toString && that.php_js.ini[ini].local_value.toString().toLowerCase && (that.php_js.ini[ini].local_value.toString().toLowerCase() === 'on' || that.php_js.ini[ini].local_value.toString().toLowerCase() === 'true')) || parseInt(that.php_js.ini[ini].local_value, 10) === 1);    };
    var display_errors = function (type) {
        return that.php_js.ini.error_reporting && (type & that.php_js.ini.error_reporting.local_value) && ini_on('display_errors');
    };
    var TYPES = { // Including all types for completeness, but should not trigger aggregates like E_STRICT or E_ALL        E_ERROR: 1,
        // Fatal run-time errors. These indicate errors that can not be recovered from, such as a memory allocation problem. Execution of the script is halted.
        E_WARNING: 2,
        // Run-time warnings (non-fatal errors). Execution of the script is not halted.
        E_PARSE: 4,        // Compile-time parse errors. Parse errors should only be generated by the parser.
        E_NOTICE: 8,
        // Run-time notices. Indicate that the script encountered something that could indicate an error, but could also happen in the normal course of running a script.
        E_CORE_ERROR: 16,
        // Fatal errors that occur during PHP's initial startup. This is like an E_ERROR, except it is generated by the core of PHP.        E_CORE_WARNING: 32,
        // Warnings (non-fatal errors) that occur during PHP's initial startup. This is like an E_WARNING, except it is generated by the core of PHP.
        E_COMPILE_ERROR: 64,
        // Fatal compile-time errors. This is like an E_ERROR, except it is generated by the Zend Scripting Engine.
        E_COMPILE_WARNING: 128,        // Compile-time warnings (non-fatal errors). This is like an E_WARNING, except it is generated by the Zend Scripting Engine.
        E_USER_ERROR: 256,
        // User-generated error message. This is like an E_ERROR, except it is generated in PHP code by using the PHP function trigger_error().
        E_USER_WARNING: 512,
        // User-generated warning message. This is like an E_WARNING, except it is generated in PHP code by using the PHP function trigger_error().        E_USER_NOTICE: 1024,
        // User-generated notice message. This is like an E_NOTICE, except it is generated in PHP code by using the PHP function trigger_error().
        E_STRICT: 2048,
        // Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code.
        E_RECOVERABLE_ERROR: 4096,        // Catchable fatal error. It indicates that a probably dangerous error occured, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR.
        E_DEPRECATED: 8192,
        // Run-time notices. Enable this to receive warnings about code that will not work in future versions.
        E_USER_DEPRECATED: 16384,
        // User-generated warning message. This is like an E_DEPRECATED, except it is generated in PHP code by using the PHP function trigger_error().        E_ALL: 30719 // All errors and warnings, as supported, except of level E_STRICT in PHP < 6.     in:32767, // PHP 6, in:30719, // PHP 5.3.x, in:6143, // PHP 5.2.x, previously:2047, //
    };
    if (typeof error_type === 'number') {
        type = error_type;
    } else { // Allow for a single string or an array of string flags        error_type = [].concat(error_type);
        for (i = 0; i < error_type.length; i++) {
            // Resolve string input to bitwise
            if (TYPES[error_type[i]]) {
                type = type | TYPES[error_type[i]];            }
        }
    }
    // BEGIN REDUNDANT
    this.php_js = this.php_js || {};    this.php_js.ini = this.php_js.ini || {};
    // END REDUNDANT
    if (type & TYPES.E_USER_ERROR || type & TYPES.E_ERROR || type & TYPES.E_CORE_ERROR || type & TYPES.E_COMPILE_ERROR || type & TYPES.E_RECOVERABLE_ERROR || type & TYPES.E_PARSE) {
        if (ini_on('track_errors')) {
            this.$php_errormsg = error_msg; // Can assign to this global, as in PHP (see http://php.net/manual/en/reserved.variables.phperrormsg.php )        }
        if (display_errors(type)) {
            prepend = this.php_js.ini.error_prepend_string ? this.php_js.ini.error_prepend_string : '';
            append = this.php_js.ini.error_append_string ? this.php_js.ini.error_append_string : '';
            this.echo(prepend + 'Error: ' + error_msg + ' ' + append);        }
        var e = new Error(error_msg); // Might, for Mozilla, allow to somehow pass in a fileName and lineNumber (2nd and 3rd arguments to Error)
        e.type = type;
        this.php_js.last_error = {
            message: e.message,            file: e.fileName,
            line: e.lineNumber,
            type: e.type
        }; // fileName and lineNumber presently not working (see note just above)
        throw e;    }
 
    if (display_errors(type)) {
        switch (type) {
        case TYPES.E_USER_WARNING:        case TYPES.E_WARNING:
        case TYPES.E_CORE_WARNING:
        case TYPES.E_COMPILE_WARNING:
            this.echo('Warning: ' + error_msg);
            break;        case TYPES.E_USER_NOTICE:
        case TYPES.E_NOTICE:
            this.echo('Notice: ' + error_msg);
            break;
        case TYPES.E_DEPRECATED:        case TYPES.E_USER_DEPRECATED:
            this.echo('Deprecated: ' + error_msg);
            break;
        default:
            throw 'Unrecognized error type';        }
    }
 
    return true;
}

1

trigger_error('This will just be a notice');

1

true