33个PHP代码样例

在PHP的流行普及中，网上总结出了很多实用的PHP代码片段，这些代码片段在当你遇到类似的问题时，粘贴过去就可以使用，非常的高效，非常的省时省力。

<?php

/**
 * 时间：2015-8-6
 * 作者：River
 * 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 = "<pre>" . $label . htmlspecialchars($output, ENT_QUOTES) . "</pre>";
            } 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 = '<pre>' . $label . htmlspecialchars($output, ENT_QUOTES) . '</pre>';
            }
        }
        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('<script language="javascript">alert("' . $content . '");window.history.back(-1)</script>');
                } else {
                    exit('<script language="javascript">alert("' . $content . '");window.location=" ' . $redirect . '   "</script>');
                }
                break;
        }

        // 信息头部
        $header = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>操作提示</title>
<style type="text/css">
body{font:12px/1.7 "\5b8b\4f53",Tahoma;}
html,body,div,p,a,h3{margin:0;padding:0;}
.tips_wrap{ background:#F7FBFE;border:1px solid #DEEDF6;width:780px;padding:50px;margin:50px auto 0;}
.tips_inner{zoom:1;}
.tips_inner:after{visibility:hidden;display:block;font-size:0;content:" ";clear:both;height:0;}
.tips_inner .tips_img{width:80px;float:left;}
.tips_info{float:left;line-height:35px;width:650px}
.tips_info h3{font-weight:bold;color:#1A90C1;font-size:16px;}
.tips_info p{font-size:14px;color:#999;}
.tips_info p.message_error{font-weight:bold;color:#F00;font-size:16px; line-height:22px}
.tips_info p.message_success{font-weight:bold;color:#1a90c1;font-size:16px; line-height:22px}
.tips_info p.return{font-size:12px}
.tips_info .time{color:#f00; font-size:14px; font-weight:bold}
.tips_info p a{color:#1A90C1;text-decoration:none;}
</style>
</head>

<body>';
        // 信息底部
        $footer = '</body></html>';

        $body = '<script type="text/javascript">
        function delayURL(url) {
        var delay = document.getElementById("time").innerHTML;
        //alert(delay);
        if(delay > 0){
        delay--;
        document.getElementById("time").innerHTML = delay;
    } else {
    window.location.href = url;
    }
    setTimeout("delayURL(\'" + url + "\')", 1000);
    }
    </script><div class="tips_wrap">
    <div class="tips_inner">
        <div class="tips_img">
            <img src="' . Yii::app()->baseUrl . '/static/images/' . $images . '"/>
        </div>
        <div class="tips_info">

            <p class="' . $class . '">' . $content . '</p>
            <p class="return">系统自动跳转在  <span class="time" id="time">' . $timeout . ' </span>  秒后，如果不想等待，<a href="' . $redirect . '">点击这里跳转</a></p>
        </div>
    </div>
</div><script type="text/javascript">
    delayURL("' . $redirect . '");
    </script>';

        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] <= 255 && $ip_array[1] <= 255 && $ip_array[2] <= 255 && $ip_array[3] <= 255 ) ? true : false;
    }

    /**
     * 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) <= $length)
            return $string;

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

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

            $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;
                } elseif (224 <= $t && $t <= 239) {
                    $tn = 3;
                    $n += 3;
                    $noc += 2;
                } elseif (240 <= $t && $t <= 247) {
                    $tn = 4;
                    $n += 4;
                    $noc += 2;
                } elseif (248 <= $t && $t <= 251) {
                    $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 < $length; $i++) {
                $strcut .= ord($string[$i]) > 127 ? $string[$i] . $string[++$i] : $string[$i];
            }
        }

        $strcut = str_replace(array($pre . '&' . $end, $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);
    }

}

?>

原文：http://www.phpxs.com/post/4116/