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。
<?php
/**
* 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 = "<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("/]=> (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 "5b8b4f53",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($str)) {
return true;
}
return preg_match(‘/^(((d{2,3}))|(d{3}-))?((0d{2,3})|0d{2,3}-)?[1-9]d{6,7}(-d{1,4})?$/‘, 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(" ", " ", $sql);
$ret = array();
$num = 0;
$queriesarray = explode("; ", trim($sql));
unset($sql);
foreach ($queriesarray as $query) {
$ret[$num] = ‘‘;
$queries = explode(" ", trim($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(" "), ‘‘, $subject)), $length, $dot, $charset);
} else {
return strip_tags(str_replace(array(" "), ‘‘, $subject));
}
}
/**
* 检测是否为英文或英文数字的组合
*
* @return unknown
*/
public static function isEnglist($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