非常实用的33个PHP代码实例

对于WEB开发人员来说PHP基本是标配，其他的程序员也可能会编上几句PHP代码。今天给大家总结了33个实用的PHP代码片段，在用到时可以直接进行复制粘贴，非常方便。也可以用来丰富自己的代码库。

/**
 * 时间：0000-00-00
 * 作者：xx
 * 超级有用、必须收藏的PHP代码样例
 */
class Helper {

 /**
 * 友好显示var_dump
 */
 static public function dump($var, $echo = true, $label = null, $strict = true) {
 $label = ( $label === null ) ? ‘‘ : rtrim($label) . ‘ ‘;
 if (!$strict) {
 if (ini_get(‘html_errors‘)) {
 $output = print_r($var, true);
 $output = "
" . $label . htmlspecialchars($output, ENT_QUOTES) . "
";
 } else {
 $output = $label . print_r($var, true);
 }
 } else {
 ob_start();
 var_dump($var);
 $output = ob_get_clean();
 if (!extension_loaded(‘xdebug‘)) {
 $output = preg_replace("/\]\=\>\n(\s+)/m", "] => ", $output);
 $output = ‘
‘ . $label . htmlspecialchars($output, ENT_QUOTES) . ‘
‘;
 }
 }
 if ($echo) {
 echo $output;
 return null;
 } else
 return $output;
 }

 /**
 * 获取客户端IP地址
 */
 static public function getClientIP() {
 static $ip = NULL;
 if ($ip !== NULL)
 return $ip;
 if (isset($_SERVER[‘HTTP_X_FORWARDED_FOR‘])) {
 $arr = explode(‘,‘, $_SERVER[‘HTTP_X_FORWARDED_FOR‘]);
 $pos = array_search(‘unknown‘, $arr);
 if (false !== $pos)
 unset($arr[$pos]);
 $ip = trim($arr[0]);
 } elseif (isset($_SERVER[‘HTTP_CLIENT_IP‘])) {
 $ip = $_SERVER[‘HTTP_CLIENT_IP‘];
 } elseif (isset($_SERVER[‘REMOTE_ADDR‘])) {
 $ip = $_SERVER[‘REMOTE_ADDR‘];
 }
 // IP地址合法验证
 $ip = ( false !== ip2long($ip) ) ? $ip : ‘0.0.0.0‘;
 return $ip;
 }

 /**
 * 循环创建目录
 */
 static public function mkdir($dir, $mode = 0777) {
 if (is_dir($dir) || @mkdir($dir, $mode))
 return true;
 if (!mk_dir(dirname($dir), $mode))
 return false;
 return @mkdir($dir, $mode);
 }

 /**
 * 格式化单位
 */
 static public function byteFormat($size, $dec = 2) {
 $a = array("B", "KB", "MB", "GB", "TB", "PB");
 $pos = 0;
 while ($size >= 1024) {
 $size /= 1024;
 $pos++;
 }
 return round($size, $dec) . " " . $a[$pos];
 }

 /**
 * 下拉框，单选按钮 自动选择
 *
 * @param $string 输入字符
 * @param $param 条件
 * @param $type 类型
 * selected checked
 * @return string
 */
 static public function selected($string, $param = 1, $type = ‘select‘) {

 if (is_array($param)) {
 $true = in_array($string, $param);
 } elseif ($string == $param) {
 $true = true;
 }
 if ($true)
 $return = $type == ‘select‘ ? ‘selected="selected"‘ : ‘checked="checked"‘;

 echo $return;
 }

 /**
 * 获得来源类型 post get
 *
 * @return unknown
 */
 static public function method() {
 return strtoupper(isset($_SERVER[‘REQUEST_METHOD‘]) ? $_SERVER[‘REQUEST_METHOD‘] : ‘GET‘ );
 }

 /**
 * 提示信息
 */
 static public function message($action = ‘success‘, $content = ‘‘, $redirect = ‘javascript:history.back(-1);‘, $timeout = 4) {

 switch ($action) {
 case ‘success‘:
 $titler = ‘操作完成‘;
 $class = ‘message_success‘;
 $images = ‘message_success.png‘;
 break;
 case ‘error‘:
 $titler = ‘操作未完成‘;
 $class = ‘message_error‘;
 $images = ‘message_error.png‘;
 break;
 case ‘errorBack‘:
 $titler = ‘操作未完成‘;
 $class = ‘message_error‘;
 $images = ‘message_error.png‘;
 break;
 case ‘redirect‘:
 header("Location:$redirect");
 break;
 case ‘script‘:
 if (empty($redirect)) {
 exit(‘‘);
 } else {
 exit(‘‘);
 }
 break;
 }

 // 信息头部
 $header = ‘







‘;
 // 信息底部
 $footer = ‘‘;

 $body = ‘













‘ . $content . ‘

系统自动跳转在 ‘ . $timeout . ‘  秒后，如果不想等待，点击这里跳转








‘;

 exit($header . $body . $footer);
 }

 /**
 * 查询字符生成
 */
 static public function buildCondition(array $getArray, array $keys = array()) {
 if ($getArray) {
 foreach ($getArray as $key => $value) {
 if (in_array($key, $keys) && $value) {
 $arr[$key] = CHtml::encode(strip_tags($value));
 }
 }
 return $arr;
 }
 }

 /**
 * base64_encode
 */
 static function b64encode($string) {
 $data = base64_encode($string);
 $data = str_replace(array(‘+‘, ‘/‘, ‘=‘), array(‘-‘, ‘_‘, ‘‘), $data);
 return $data;
 }

 /**
 * base64_decode
 */
 static function b64decode($string) {
 $data = str_replace(array(‘-‘, ‘_‘), array(‘+‘, ‘/‘), $string);
 $mod4 = strlen($data) % 4;
 if ($mod4) {
 $data .= substr(‘====‘, $mod4);
 }
 return base64_decode($data);
 }

 /**
 * 验证邮箱
 */
 public static function email($str) {
 if (empty($str))
 return true;
 $chars = "/^([a-z0-9+_]|\\-|\\.)+@(([a-z0-9_]|\\-)+\\.)+[a-z]{2,6}\$/i";
 if (strpos($str, ‘@‘) !== false && strpos($str, ‘.‘) !== false) {
 if (preg_match($chars, $str)) {
 return true;
 } else {
 return false;
 }
 } else {
 return false;
 }
 }

 /**
 * 验证手机号码
 */
 public static function mobile($str) {
 if (empty($str)) {
 return true;
 }

 return preg_match(‘#^13[\d]{9}$|14^[0-9]\d{8}|^15[0-9]\d{8}$|^18[0-9]\d{8}$#‘, $str);
 }

 /**
 * 验证固定电话
 */
 public static function tel($str) {
 if (empty($str)) {
 return true;
 }
 return preg_match(‘/^((\(\d{2,3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}(\-\d{1,4})?$/‘, trim($str));
 }

 /**
 * 验证qq号码
 */
 public static function qq($str) {
 if (empty($str)) {
 return true;
 }

 return preg_match(‘/^[1-9]\d{4,12}$/‘, trim($str));
 }

 /**
 * 验证邮政编码
 */
 public static function zipCode($str) {
 if (empty($str)) {
 return true;
 }

 return preg_match(‘/^[1-9]\d{5}$/‘, trim($str));
 }

 /**
 * 验证ip
 */
 public static function ip($str) {
 if (empty($str))
 return true;

 if (!preg_match(‘#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#‘, $str)) {
 return false;
 }

 $ip_array = explode(‘.‘, $str);

 //真实的ip地址每个数字不能大于255（0-255）
 return ( $ip_array[0]  }

 /**
 * 验证身份证(中国)
 */
 public static function idCard($str) {
 $str = trim($str);
 if (empty($str))
 return true;

 if (preg_match("/^([0-9]{15}|[0-9]{17}[0-9a-z])$/i", $str))
 return true;
 else
 return false;
 }

 /**
 * 验证网址
 */
 public static function url($str) {
 if (empty($str))
 return true;

 return preg_match(‘#(http|https|ftp|ftps)://([\w-]+\.)+[\w-]+(/[\w-./?%&=]*)?#i‘, $str) ? true : false;
 }

 /**
 * 根据ip获取地理位置
 * @param $ip
 * return :ip,beginip,endip,country,area
 */
 public static function getlocation($ip = ‘‘) {
 $ip = new XIp();
 $ipArr = $ip->getlocation($ip);
 return $ipArr;
 }

 /**
 * 中文转换为拼音
 */
 public static function pinyin($str) {
 $ip = new XPinyin();
 return $ip->output($str);
 }

 /**
 * 拆分sql
 *
 * @param $sql
 */
 public static function splitsql($sql) {
 $sql = preg_replace("/TYPE=(InnoDB|MyISAM|MEMORY)( DEFAULT CHARSET=[^; ]+)?/", "ENGINE=\\1 DEFAULT CHARSET=" . Yii::app()->db->charset, $sql);
 $sql = str_replace("\r", "\n", $sql);
 $ret = array();
 $num = 0;
 $queriesarray = explode(";\n", trim($sql));
 unset($sql);
 foreach ($queriesarray as $query) {
 $ret[$num] = ‘‘;
 $queries = explode("\n", trim($query));
 $queries = array_filter($queries);
 foreach ($queries as $query) {
 $str1 = substr($query, 0, 1);
 if ($str1 != ‘#‘ && $str1 != ‘-‘)
 $ret[$num] .= $query;
 }
 $num++;
 }
 return ($ret);
 }

 /**
 * 字符截取
 *
 * @param $string
 * @param $length
 * @param $dot
 */
 public static function cutstr($string, $length, $dot = ‘...‘, $charset = ‘utf-8‘) {
 if (strlen($string)  return $string;

 $pre = chr(1);
 $end = chr(1);
 $string = str_replace(array(‘&‘, ‘"‘, ‘‘), array($pre . ‘&‘ . $end, $pre . ‘"‘ . $end, $pre . ‘‘ . $end), $string);

 $strcut = ‘‘;
 if (strtolower($charset) == ‘utf-8‘) {

 $n = $tn = $noc = 0;
 while ($n 
 $t = ord($string[$n]);
 if ($t == 9 || $t == 10 || ( 32  $tn = 1;
 $n++;
 $noc++;
 } elseif (194  $tn = 2;
 $n += 2;
 $noc += 2;
 } elseif (224  $tn = 3;
 $n += 3;
 $noc += 2;
 } elseif (240  $tn = 4;
 $n += 4;
 $noc += 2;
 } elseif (248  $tn = 5;
 $n += 5;
 $noc += 2;
 } elseif ($t == 252 || $t == 253) {
 $tn = 6;
 $n += 6;
 $noc += 2;
 } else {
 $n++;
 }

 if ($noc >= $length) {
 break;
 }
 }
 if ($noc > $length) {
 $n -= $tn;
 }

 $strcut = substr($string, 0, $n);
 } else {
 for ($i = 0; $i  $strcut .= ord($string[$i]) > 127 ? $string[$i] . $string[++$i] : $string[$i];
 }
 }

 $strcut = str_replace(array($pre . ‘&‘ . $end, $pre . ‘"‘ . $end, $pre . ‘‘ . $end), array(‘&‘, ‘"‘, ‘‘), $strcut);

 $pos = strrpos($strcut, chr(1));
 if ($pos !== false) {
 $strcut = substr($strcut, 0, $pos);
 }
 return $strcut . $dot;
 }

 /**
 * 描述格式化
 * @param $subject
 */
 public static function clearCutstr($subject, $length = 0, $dot = ‘...‘, $charset = ‘utf-8‘) {
 if ($length) {
 return XUtils::cutstr(strip_tags(str_replace(array("\r\n"), ‘‘, $subject)), $length, $dot, $charset);
 } else {
 return strip_tags(str_replace(array("\r\n"), ‘‘, $subject));
 }
 }

 /**
 * 检测是否为英文或英文数字的组合
 *
 * @return unknown
 */
 public static function isEnglist($param) {
 if (!eregi("^[A-Z0-9]{1,26}$", $param)) {
 return false;
 } else {
 return true;
 }
 }

 /**
 * 将自动判断网址是否加http://
 *
 * @param $http
 * @return string
 */
 public static function convertHttp($url) {
 if ($url == ‘http://‘ || $url == ‘‘)
 return ‘‘;

 if (substr($url, 0, 7) != ‘http://‘ && substr($url, 0, 8) != ‘https://‘)
 $str = ‘http://‘ . $url;
 else
 $str = $url;
 return $str;
 }

 /*
 标题样式格式化
 */

 public static function titleStyle($style) {
 $text = ‘‘;
 if ($style[‘bold‘] == ‘Y‘) {
 $text .=‘font-weight:bold;‘;
 $serialize[‘bold‘] = ‘Y‘;
 }

 if ($style[‘underline‘] == ‘Y‘) {
 $text .=‘text-decoration:underline;‘;
 $serialize[‘underline‘] = ‘Y‘;
 }

 if (!empty($style[‘color‘])) {
 $text .=‘color:#‘ . $style[‘color‘] . ‘;‘;
 $serialize[‘color‘] = $style[‘color‘];
 }

 return array(‘text‘ => $text, ‘serialize‘ => empty($serialize) ? ‘‘ : serialize($serialize));
 }

 // 自动转换字符集 支持数组转换
 static public function autoCharset($string, $from = ‘gbk‘, $to = ‘utf-8‘) {
 $from = strtoupper($from) == ‘UTF8‘ ? ‘utf-8‘ : $from;
 $to = strtoupper($to) == ‘UTF8‘ ? ‘utf-8‘ : $to;
 if (strtoupper($from) === strtoupper($to) || empty($string) || (is_scalar($string) && !is_string($string))) {
 //如果编码相同或者非字符串标量则不转换
 return $string;
 }
 if (is_string($string)) {
 if (function_exists(‘mb_convert_encoding‘)) {
 return mb_convert_encoding($string, $to, $from);
 } elseif (function_exists(‘iconv‘)) {
 return iconv($from, $to, $string);
 } else {
 return $string;
 }
 } elseif (is_array($string)) {
 foreach ($string as $key => $val) {
 $_key = self::autoCharset($key, $from, $to);
 $string[$_key] = self::autoCharset($val, $from, $to);
 if ($key != $_key)
 unset($string[$key]);
 }
 return $string;
 } else {
 return $string;
 }
 }

 /*
 标题样式恢复
 */

 public static function titleStyleRestore($serialize, $scope = ‘bold‘) {
 $unserialize = unserialize($serialize);
 if ($unserialize[‘bold‘] == ‘Y‘ && $scope == ‘bold‘)
 return ‘Y‘;
 if ($unserialize[‘underline‘] == ‘Y‘ && $scope == ‘underline‘)
 return ‘Y‘;
 if ($unserialize[‘color‘] && $scope == ‘color‘)
 return $unserialize[‘color‘];
 }

 /**
 * 列出文件夹列表
 *
 * @param $dirname
 * @return unknown
 */
 public static function getDir($dirname) {
 $files = array();
 if (is_dir($dirname)) {
 $fileHander = opendir($dirname);
 while (( $file = readdir($fileHander) ) !== false) {
 $filepath = $dirname . ‘/‘ . $file;
 if (strcmp($file, ‘.‘) == 0 || strcmp($file, ‘..‘) == 0 || is_file($filepath)) {
 continue;
 }
 $files[] = self::autoCharset($file, ‘GBK‘, ‘UTF8‘);
 }
 closedir($fileHander);
 } else {
 $files = false;
 }
 return $files;
 }

 /**
 * 列出文件列表
 *
 * @param $dirname
 * @return unknown
 */
 public static function getFile($dirname) {
 $files = array();
 if (is_dir($dirname)) {
 $fileHander = opendir($dirname);
 while (( $file = readdir($fileHander) ) !== false) {
 $filepath = $dirname . ‘/‘ . $file;

 if (strcmp($file, ‘.‘) == 0 || strcmp($file, ‘..‘) == 0 || is_dir($filepath)) {
 continue;
 }
 $files[] = self::autoCharset($file, ‘GBK‘, ‘UTF8‘);
 ;
 }
 closedir($fileHander);
 } else {
 $files = false;
 }
 return $files;
 }

 /**
 * [格式化图片列表数据]
 *
 * @return [type] [description]
 */
 public static function imageListSerialize($data) {

 foreach ((array) $data[‘file‘] as $key => $row) {
 if ($row) {
 $var[$key][‘fileId‘] = $data[‘fileId‘][$key];
 $var[$key][‘file‘] = $row;
 }
 }
 return array(‘data‘ => $var, ‘dataSerialize‘ => empty($var) ? ‘‘ : serialize($var));
 }

 /**
 * 反引用一个引用字符串
 * @param $string
 * @return string
 */
 static function stripslashes($string) {
 if (is_array($string)) {
 foreach ($string as $key => $val) {
 $string[$key] = self::stripslashes($val);
 }
 } else {
 $string = stripslashes($string);
 }
 return $string;
 }

 /**
 * 引用字符串
 * @param $string
 * @param $force
 * @return string
 */
 static function addslashes($string, $force = 1) {
 if (is_array($string)) {
 foreach ($string as $key => $val) {
 $string[$key] = self::addslashes($val, $force);
 }
 } else {
 $string = addslashes($string);
 }
 return $string;
 }

 /**
 * 格式化内容
 */
 static function formatHtml($content, $options = ‘‘) {
 $purifier = new CHtmlPurifier();
 if ($options != false)
 $purifier->options = $options;
 return $purifier->purify($content);
 }

}

?>

 来源：景德镇SEO