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php ¸¹À̾²´Â ÇÔ¼öÁ¤¸®
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function go($move = "back",$time = "0") {
    if($move == "back") echo("<script>history.back();</script>");
    else echo("<meta http-equiv='refresh' content='$time;url=$move'>");
}

//¸Þ½ÃÁöâ+È÷½ºÅ丮¹é
function alert($message,$move = "back") {
    $print = "<script>window.alert('$message');";
    if($move == "back") $print .= "history.back();";
    else $print .= "location.href = '$move';";
    $print .= "</script>";
    echo("$print");
    exit;
}

//µðºñÁ¢¼Ó
function db() {
    global $connect;
    if(!$connect) {
        $connect = mysql_connect("localhost","testid","1234") or die("MySQL Á¢¼Ó ½ÇÆÐ");
        mysql_select_db("testdb",$connect) or die("MySQL Á¢¼Ó ½ÇÆÐ");
    }
}

//´Ü¾î ÇÊÅ͸µ
function filter($string,$filter = "",$type = "change",$change = "###") {
    if(!$filter) return $string;
    $filter = explode(",",$filter);
    $fcount = sizeof($filter);
    for($i = 0;$i < $fcount;$i++) {
        if(eregi($filter[$i],$string)) {
            if($type == "error") alert(""$filter[$i]"Àº(´Â) ±ÝÄ¢¾îÀÔ´Ï´Ù.");
            else $string = str_replace($filter[$i],$change,$string);
        }
    }
    return $string;
}

//¹®ÀÚ¿­ Ä¿Æ®
function cutstr($str,$size) {
    if(!$size or (strlen($str) <= $size)) return $str;
    else for($i = 0;$i < $size;$i++) if(ord($str[$i]) > 127) $over++;
    return chop(substr($str,0,$size - $over%2))."...";
}

//Å×ÀÌºí »ý¼º¿©ºÎ üũ
function tablecheck($table,$db)
    $result = mysql_list_tables($db);
    for($i = 0;$i < mysql_num_rows($result);$i++) {
        if($table == mysql_tablename($result,$i)) return true;
    }
    return false;
}

//ºü¸¥ DBÀÚ·á ·Îµå(³ë°¡´Ù µµ¿ì¹Ì;;)
function select($table,$field = "*",$where = "") {
    if(!$table) return false;
    $q = "select $field from $table";
    if($where) $q .= " where $where";
    $result = mysql_query($q);
    $return = mysql_fetch_array($result);
    return $return;
}

//////////¾Æ·¡´Â Á¦·Îº¸µå lib.php¿¡¼­ ¹ßÃéÇÑ ÇÔ¼öÀÔ´Ï´Ù.

// ºó¹®ÀÚ¿­ °æ¿ì 1À» ¸®ÅÏ
function isblank($str) {
    $temp=str_replace("¡¡","",$str);
    $temp=str_replace("n","",$temp);
    $temp=strip_tags($temp);
    $temp=str_replace(" ","",$temp);
    $temp=str_replace(" ","",$temp);
    if(eregi("[^[:space:]]",$temp)) return 0;
    return 1;
}


// ¼ýÀÚÀÏ °æ¿ì 1À» ¸®ÅÏ
function isnum($str) {
    if(eregi("[^0-9]",$str)) return 0;
    return 1;
}


// ¼ýÀÚ, ¿µ¹®ÀÚ ÀÏ°æ¿ì 1À» ¸®ÅÏ
function isalNum($str) {
    if(eregi("[^0-9a-zA-Z_]",$str)) return 0;
    return 1;
}


// HTML Tag¸¦ Á¦°ÅÇÏ´Â ÇÔ¼ö
function del_html( $str ) {
    $str = str_replace( ">", ">",$str );
    $str = str_replace( "<", "<",$str );
    return $str;
}


// Áֹεî·Ï¹øÈ£ °Ë»ç
function check_jumin($jumin) {
    $weight = '234567892345'; // ÀÚ¸®¼ö weight ÁöÁ¤
    $len = strlen($jumin);
    $sum = 0;

    if ($len <> 13) return false;

    for ($i = 0; $i < 12; $i++) {
        $sum = $sum + (substr($jumin,$i,1)*substr($weight,$i,1));
    }

    $rst = $sum%11;
    $result = 11 - $rst;

    if ($result == 10) $result = 0;
    else if ($result == 11) $result = 1;

    $ju13 = substr($jumin,12,1);

    if ($result <> $ju13) return false;
    return true;
}


// E-mail ÁÖ¼Ò°¡ ¿Ã¹Ù¸¥Áö °Ë»ç
function ismail( $str ) {
    if( eregi("([a-z0-9_-.]+)@([a-z0-9_-.]+)", $str) ) return $str;
    else return '';
}

// E-mail ÀÇ MX¸¦ °Ë»öÇÏ¿© ½ÇÁ¦ Á¸ÀçÇÏ´Â ¸ÞÀÏÀÎÁö °Ë»ç
function mail_mx_check($email) {
    if(!ismail($email)) return false;
    list($user, $host) = explode("@", $email);
    if (checkdnsrr($host, "MX") or checkdnsrr($host, "A")) return true;
    else return false;
}


// ȨÆäÀÌÁö ÁÖ¼Ò°¡ ¿Ã¹Ù¸¥Áö °Ë»ç
function isHomepage( $str ) {
    if(eregi("^http://([a-z0-9_-./~@?=&-#{5,}]+)", $str)) return $str;
    else return '';
}


// URL, MailÀ» ÀÚµ¿À¸·Î üũÇÏ¿© ¸µÅ©¸¸µë
function autolink($str) {
    // URL ġȯ
    $homepage_pattern = "/([^"'=>])(mms|http|HTTP|ftp|FTP|telnet|TELNET)://(.[^ n<"']+)/";
    $str = preg_replace($homepage_pattern,"\1<a href=\2://\3 target=_blank>\2://\3</a>", " ".$str);

    // ¸ÞÀÏ Ä¡È¯
    $email_pattern = "/([ n]+)([a-z0-9_-.]+)@([a-z0-9_-.]+)/";
    $str = preg_replace($email_pattern,"\1<a href=mailto:\2@\3>\2@\3</a>", " ".$str);

    return $str;
}


// ÆÄÀÏ »çÀÌÁ kb, mb¿¡ ¸ÂÃ߾ º¯È¯Çؼ­ ¸®ÅÏ
function getfilesize($size) {
    if(!$size) return "0 Byte";
    if($size<1024) {
        return ($size." Byte");
    } elseif($size >1024 && $size< 1024 *1024)  {
        return sprintf("%0.1f KB",$size / 1024);
    }
    else return sprintf("%0.2f MB",$size / (1024*1024));
}

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php ¹®ÀÚ¿­ ÀÚ¸£±â, ºñ±³, ã±â ÇÔ¼ö, str_replace, substr ,strpos, explode µîµî Á¤¸®
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is_numeric
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[PHP] ¼Ò¼öÁ¡ °è»ê
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