<?php

show('試験の文章(SJIS)');
show('Alphabet only.');
ob_start();
show(mb_convert_encoding('試験の文章(UTF-8)','UTF-8','SJIS'));
echo mb_convert_encoding(ob_get_clean(),'SJIS','UTF-8');

function show($text){
    $text=htmlspecialchars($text,ENT_QUOTES,'UTF-8');
    echo "'$text'(".strlen($text).")";
    echo rawurlencode($text);
    echo "\n-----------------------\n";
}

''(0)
-----------------------
'Alphabet only.'(14)Alphabet%20only.
-----------------------
'試験の文章(UTF-8)'(22)%E8%A9%A6%E9%A8%93%E3%81%AE%E6%96%87%E7%AB%A0%28UTF-8%29
-----------------------

<?php
class restriction {
    static private $allowHtmlTags=array();
    static public function init(){
        self::$allowHtmlTags['tags']='a|address|area|b|basefont|bgsound|big|blink|blockquote|br|caption|center|cite|code|colgroup'.
            '|dd|del|div|dl|dt|em|fieldset|font|h1|h2|h3|h4|h5|h6|hr|i|img|ins|label|legend|li|map|marquee|nobr|ol|p|pre|q|rb|rp|rt|ruby|s|samp|small'.
            '|span|strike|strong|sub|sup|table|tbody|td|tfoot|th|thead|tr|tt|u|ul|var';
        self::$allowHtmlTags['props']='align|alt|background|balance|bgcolor|border|bordercolor|bordercolordark|bordercolorlight|class|cellpadding|cellspacing'.
            '|color|compact|cite|clear|face|for|frame|gallervimg|height|href|hspace|id|loop|name|noshade|rules|size|span|src|start|summary|target|type|usemap|value|volume|vspace|width|';
        self::$allowHtmlTags['pattern']=array(
            '!&lt;(/?)(<%tags%>)(([\s]+(<%props%>)="(http:|https:|ftp:|[^":])[^":]*")*)([\s]*/?)&gt;!i'=>'<$1$2$3$7>',
            '!&lt;%([\s\S]*?)%&gt;!'=>'<%$1%>',
            '!&lt;--([\s\S]*?)--&gt;!'=>'<!--$1-->'
        );
    }
    static public function allowHtmlTags($tags=0, $props=0, $patterns=0){
        static $search=0,$replace=0;
        // When the paramers are not given, return the cached values
        if ($search && $replace && !($tags||$props||$patterns)) return array($search,$replace);
        // When the paramers are given, change the setting.
        if ($tags) {
            if (is_array($tags)) $tags=implode('|',$tags);
            if (preg_match('/[\|a-z]/i',$tags)) self::$allowHtmlTags['tags'].='|'.$tags;
        }
        if ($props) {
            if (is_array($pros)) $pros=implode('|',$pros);
            if (preg_match('/[\|a-z]/i',$pros)) self::$allowHtmlTags['pros'].='|'.$pros;
        }
        if ($patterns) {
            foreach($patterns as $key=>$value) self::$allowHtmlTags['pattern'][$key]=$value;
        }
        $search=$replace=array();
        foreach(self::$allowHtmlTags['pattern'] as $key=>$value){
            $search[]=str_replace(
                array('<%tags%>','<%props%>'),
                array(self::$allowHtmlTags['tags'],self::$allowHtmlTags['props']),
                $key);
            $replace[]=$value;
        }
        // Return the values, finally.
        return array($search,$replace);
    }
    static public function restrictHtmlTags($html){
        list($search,$replace)=self::allowHtmlTags();
        $html=str_replace(array('&','<','>'),array('&amp;','&lt;','&gt;'),$html);
        $html=preg_replace($search,$replace,$html);
        $html=str_replace('&amp;','&',$html);
        return $html;
    }
    
}

static public function checkFile($dir,$file){
    if (strpos($fullpath=realpath($dir.$file),realpath($dir))===0) return file_exists($fullpath);
    exit('Are you trying the directory traversal?');
}

// There is only one global function.
function __autoload($className) {
    core::autoload($className);
}
class core {
    static function autoload($className){
        switch(substr($className,0,3)){
        case 'jp_': // plugins
            if (file_exists($file=DIR_PLUGINS.$className.'.php')) {
                require_once($file);
            } else exit ('Class PHP file not found.');
            break;
        default:
            if (file_exists($file=DIR_LIBS.$className.'.php')) {
                require_once($file); // libraries
            } elseif (file_exists($file=$className.'.php')) {
                require_once($file); // file in current directory.
            } else exit ('Class PHP file not found.');
            break;
        }
        // Call init() method if exists.
        @call_user_func(array($className,'init'));
    }

class core {
    static function p(){
        foreach(func_get_args() as $text){
            echo htmlspecialchars($text,ENT_QUOTES,_CHARSET);
        }
    }
    static function fill(string $html,$data){
        if (!is_array($data)) $data=array($data);
        $search=array();
        $replace=array();
        foreach($data as $key=>$value){
            $search[]='<%'.(is_integer($key)?$key+1:$key).'%>';
            $replace[]=htmlspecialchars($value,ENT_QUOTES,_CHARSET);
        }
        return str_replace($search,$replace,$html);
    }
    static function echohtml(string $html,$data){
        echo self::fill($html,$data);
    }

core::echohtml('<b>ID: <%1%>, title:<%2%></b>',array($itemid,$title));

class sql {
    static public function query ($query,$data=null){
        if ($data!==null) $query=self::fill($query,$data);
        self::checkQuery($query);
        $res=sqlite_query (self::$obj->db,$query);
        return $res;
    }
    static function fill($query,$data){
        if (!is_array($data)) $data=array($data);
        $search=array();
        $replace=array();
        foreach($data as $key=>$value){
            $search[]='<%'.(is_integer($key)?$key+1:$key).'%>';
            if (is_integer($value)) {
                $replace[]=(int)$value;
            } elseif(is_numeric($value)) {
                $replace[]=(float)$value;
            } else {
                $replace[]="'".sqlite_escape_string($value)."'";
            }
        }
        return str_replace($search,$replace,$query);
    }
    static private function checkQuery($query){
        $query=preg_replace('/;[\s]*$/','',$query); // remove last ';';
        if (strpos($query,';')===false) return; // if there isn't ';', OK.
        foreach(preg_split("/'/",$query) as $key=>$value){
            if ($key%2==1) continue; // ignore inside string
            if (strpos($value,';')===false) continue; // if there isn't ';', OK.
            exit('Cannot divide SQL query by ";"');
        }
    }

$res=sql::query('SELECT * FROM jeans_item WHERE category=<%1%> AND title=<%2%>', array($itemid,$title));