<?php

/**
 * Escape a string suitably for embedding in JavaScript.
 * See http://rumkin.com/refernce/algorithms/escaping/ for more information.
 *
 * Quick usage to embed strings inside JavaScript.  Note, I added an extra
 * space in "< ?php" and "? >" that you will need to remove to make this work.
 *
 *     var myJs = < ?php
 *         echo php_to_js("anything you like");
 *     ? >;  // No quotes necessary
 *     var embeddded = "Hello, < ?php
 *         echo php_to_js("John Doe");
 *     ? >, how are you?";
 *
 * @license MIT with additional non-advertising clause
 * @see https://rumkin.com/license/
 * @param string $str The string to escape and wrap in quotes
 * @param boolean $skipQuotes If true, don't wrap string with quotes
 * @return string Escaped and probably quoted string for JavaScript
 */
function php_to_js($str, $skipQuotes = false) {
    $replacements = array(
        "/(<scr)(ipt)/i" => "$1\"+\"$2",  // Break up "<script" tags
        '/\\\\/' => '\\\\',               // Escape backslashes
        '/"/' => '\\"',                   // Escape quotes
        "/'/" => "\\'",                   // Escape apostrophes
        "/\r\n/" => "\n",                 // Convert DOS newlines into Unix
        "/\r/" => "\n",                   // Convert Mac newlines into Unix
        "/\n/" => "\\n\"+\n\"",           // Convert Unix newlines
    );

    $str = preg_replace(array_keys($replacements), array_values($replacements), $str);

    if ($skipQuotes) {
        return $str;
    }

    return '"' . $str . '"';
}