php 常用函数收藏（一）

/**
* 返回经addslashes处理过的字符串或数组
* @param $string 需要处理的字符串或数组
* @return mixed
*/
function new_addslashes($string){
     if(!is_array($string)) return addslashes($string);
     foreach($string as $key => $val) $string[$key] = new_addslashes($val);
     return $string;
}

/**
* 返回经stripslashes处理过的字符串或数组
* @param $string 需要处理的字符串或数组
* @return mixed
*/
function new_stripslashes($string) {
     if(!is_array($string)) return stripslashes($string);
     foreach($string as $key => $val) $string[$key] = new_stripslashes($val);
     return $string;
}

/**
* 返回经addslashe处理过的字符串或数组
* @param $obj 需要处理的字符串或数组www.zzzyk.com
* @return mixed
*/
function new_html_special_chars($string) {
     if(!is_array($string)) return htmlspecialchars($string);
     foreach($string as $key => $val) $string[$key] = new_html_special_chars($val);
     return $string;
}
/**
* 安全过滤函数
*
* @param $string
* @return string
*/
function safe_replace($string) {
     $string = str_replace('%20','',$string);
     $string = str_replace('%27','',$string);
     $string = str_replace('%2527','',$string);
     $string = str_replace('*','',$string);
     $string = str_replace('"','"',$string);
     $string = str_replace("'",'',$string);
     $string = str_replace('"','',$string);
     $string = str_replace(';','',$string);
     $string = str_replace('<','<',$string);
     $string = str_replace('>','>',$string);
     $string = str_replace("{",'',$string);
     $string = str_replace('}','',$string);
     return $string;
}

/**
* 过滤ASCII码从0-28的控制字符
* @return String
*/
function trim_unsafe_control_chars($str) {
     $rule = '/[' . chr ( 1 ) . '-' . chr ( 8 ) . chr ( 11 ) . '-' . chr ( 12 ) . chr ( 14 ) . '-' . chr ( 31 ) . ']*/';
     return str_replace ( chr ( 0 ), '', preg_replace ( $rule, '', $str ) );
}

/**
* 格式化文本域内容
*
* @param $string 文本域内容
* @return string
*/
function trim_textarea($string) {
     $string = nl2br ( str_replace ( ' ', ' ', $string ) );
     return $string;
}

/**
* 将文本格式成适合js输出的字符串
* @param string $string 需要处理的字符串
* @param intval $isjs 是否执行字符串格式化，默认为执行
* @return string 处理后的字符串
*/
function format_js($string, $isjs = 1)
{
     $string = addslashes(str_replace(array("\r", "\n"), array('', ''), $string));
     return $isjs ? 'document.write("'.$string.'");' : $string;
}

/**
* 转义javascript 代码标记
*
* @param $str
* @return mixed
*/
function trim_script($str) {
     $str = preg_replace ( '/\<([\/]?)script([^\>]*?)\>/si', '<\\1script\\2>', $str );
     $str = preg_replace ( '/\<([\/]?)iframe([^\>]*?)\>/si', '<\\1iframe\\2>', $str );
     $str = preg_replace ( '/\<([\/]?)frame([^\>]*?)\>/si', '<\\1frame\\2>', $str );
     $str = preg_replace ( '/]]\>/si', ']] >', $str );
     return $str;
}
/**
* 获取当前页面完整URL地址
*/
function get_url() {
     $sys_protocal = isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443' ? 'https://' : 'http://';
     $php_self = $_SERVER['PHP_SELF'] ? safe_replace($_SERVER['PHP_SELF']) : safe_replace($_SERVER['SCRIPT_NAME']);
     $path_info = isset($_SERVER['PATH_INFO']) ? safe_replace($_SERVER['PATH_INFO']) : '';
     $relate_url = isset($_SERVER['REQUEST_URI']) ? safe_replace($_SERVER['REQUEST_URI']) : $php_self.(isset($_SERVER['QUERY_STRING']) ? '?'.safe_replace($_SERVER['QUERY_STRING']) : $path_info);
     return $sys_protocal.(isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '').$relate_url;
}
/**
* 字符截取支持UTF8/GBK
* @param $string
* @param $length
* @param $dot
*/
function str_cut($string, $length, $dot = '...') {
     $strlen = strlen($string);
     if($strlen <= $length) return $string;
     $string = str_replace(array(' ',' ', '&', '"', ''', '“', '”', '—', '<', '>', '·', '…'), array('∵',' ', '&', '"', "'", '“', '”', '—', '<', '>', '·', '…'), $string);
     $strcut = '';
     if(strtolower(CHARSET) == 'utf-8') {
         $length = intval($length-strlen($dot)-$length/3);
         $n = $tn = $noc = 0;
         while($n < strlen($string)) {
             $t = ord($string[$n]);
             if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
                 $tn = 1; $n++; $noc++;
             } elseif(194 <= $t && $t <= 223) {
                 $tn = 2; $n += 2; $noc += 2;
         &n

补充：Web开发 , php ,