quick.php

<?php
function jc_get_styles(){
    
    $styles = array();
    
    $styles[0]["text"]='<span class="white">Black text on white </span>';
    $styles[0]["title"]='Click here to set Style 0';
    $styles[0]["sheet"]='style/white';

    $styles[1]["text"]='<span class="black">White text on black </span>';
    $styles[1]["title"]='Click here to set Style 1';
    $styles[1]["sheet"]='style/black';
    
    $styles[2]["text"]='<span class="blackLarge">White text(large) on black </span>';
    $styles[2]["title"]='Click here to set Style 2';
    $styles[2]["sheet"]='style/black_l';
    
    $styles[3]["text"]='<span class="whiteLarge">Black text(large) on white </span>';
    $styles[3]["title"]='Click here to set Style 3';
    $styles[3]["sheet"]='style/white_l';

    $styles[4]["text"]='<span class="dyslexic">Off white  for people with Dyslexia</span>';
    $styles[4]["title"]='Click here to set Style 4';
    $styles[4]["sheet"]='style/dyslexic';

    $styles[5]["text"]='<span class="white">Single column black text on white </span>';
    $styles[5]["title"]='Click here to set Style 5';
    $styles[5]["sheet"]='style/zoom_w';

    $styles[6]["text"]='<span class="blackZoom">Single column white text on black </span>';
    $styles[6]["title"]='Click here to set Style 6';
    $styles[6]["sheet"]='style/zoom_b';
    
    return $styles;
}

add_action( 'wp_head', 'jc_print_style' );
function jc_print_style(){
    $styles = jc_get_styles();
    
    if(!isset($_COOKIE["STYLE"])){
        if(isset($_SESSION["STYLE"])){
            echo '<link href="'. trailingslashit( get_stylesheet_directory_uri() ) . $styles[$_SESSION["STYLE"]]["sheet"] .'.css" rel="stylesheet" type="text/css" />';
        } else {
            echo '<link href="'. trailingslashit( get_stylesheet_directory_uri() ) . $styles[0]["sheet"] . '.css" rel="stylesheet" type="text/css" />';;
        }
    } else {
        echo '<link href="'. trailingslashit( get_stylesheet_directory_uri() ) . $styles[$_COOKIE["STYLE"]]["sheet"] . '.css" rel="stylesheet" type="text/css" />';
    }
}