常用PHP 函数库

1、关于 URL

<?php
/*
* 返回页面的当前完整路径，包括参数
*/
function currentUrl() {
$url = 'http';
if ($_SERVER["HTTPS"] == "on") $url .= "s";
$url .= "://";
if ($_SERVER["SERVER_PORT"] != "80") {
$url .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
} else {
$url .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
}
return $url;
}
/*
* 返回页面的当前完整路径，不包括参数
*/
function curUrlNoArgs() {
$url = 'http';
if ($_SERVER["HTTPS"] == "on") $url .= "s";
$url .= "://";
$this_page = $_SERVER["REQUEST_URI"];
# 不获取?后面的参数
if (strpos($this_page, "?") !== false) $this_page = reset(explode("?", $this_page));
if ($_SERVER["SERVER_PORT"] != "80") {
$url .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $this_page;
} else {
$url .= $_SERVER["SERVER_NAME"] . $this_page;
}
return $url;
}
/*
* $_SERVER['REQUEST_URI'] 的通用解决方案，防止 rewrite 规则可能出现错误
*/
function requestURI() {
if (isset($_SERVER['REQUEST_URI'])){
$uri = $_SERVER['REQUEST_URI'];
} else {
if (isset($_SERVER['argv'])) {
$uri = $_SERVER['PHP_SELF'] .'?'. $_SERVER['argv'][0];
} else {
$uri = $_SERVER['PHP_SELF'] .'?'. $_SERVER['QUERY_STRING'];
}
}
return $uri;
}
?>

2、数据入库前格式化数据，防止 SQL 注入

<?php
/*
* 数据入库之前格式化数据（防止 SQL 注入）
*/
function site_addslashes($string, $force = 0) {
!defined('MAGIC_QUOTES_GPC') && define('MAGIC_QUOTES_GPC', get_magic_quotes_gpc());
if(!MAGIC_QUOTES_GPC || $force) {
if(is_array($string)) {
foreach($string as $key => $val) {
$string[$key] = daddslashes($val, $force);
}
} else {
$string = addslashes($string);
}
}
return $string;
}
?>

3、PHP 生成 唯一标识符码

<?php
/*
* 唯一标识符
*/
function create_unique() {
$data = $_SERVER['HTTP_USER_AGENT'] . $_SERVER['REMOTE_ADDR'] .time() . rand();
return sha1($data);
}
?>

4、PHP表单验证类 validator.class.php

<?php
#验证类
class validator {
/**
* 验证邮箱
* @param string $string
* @param bool $required
* @return bool
*/
public static function isEmail ($string, $required = false) {
$isRightFormat = false;
if($string == '' && $required ===false) $isRightFormat = true;
$exp_match = '/([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)/';
$isRightFormat = preg_match($exp_match, $string) ? true : false;
return $isRightFormat;
}
/**
* 验证 URL
* @param string $string
* @param bool $required
* @return bool
*/
public static function isHttpUrl ($string, $required =false) {
$isRightFormat = false;
if($string =='' && $required ===false) $isRightFormat = true;
$exp_match = '/^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/';
$isRightFormat = preg_math($exp_match, $string) ? true : false;
return $isRightFormat;
}
/**
* 验证手机
* @param string $string
* @param bool $required
* @return bool
*/
public static function isCellPhone ($string, $required = false) {
$isRightFormat = false;
if($string == '' && $required ===false) $isRightFormat = true;
$exp_match = '/^((\(\d{3}\))|(\d{3}\-))?1[3,5]\d{9}$/';
$isRightFormat = preg_match($exp_match, $string) ? true : false;
return $isRightFormat;
}
/**
* 验证电话号码
* @param string $string
* @param bool $required
* @return bool
*/
public static function isPhone ($string, $required = false) {
$isRightFormat = false;
if($string == "" && $required === false) $isRightFormat = true;
$exp_match = '/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/';
$isRightFormat = preg_match($exp_match, $string) ? true : false;
return $isRightFormat;
}
/**
* 验证邮编
* @param string $string
* @param bool $required
* @return bool
*/
public static function isZipCode ($string, $required =false) {
$isRightFormat = false;
if($string == '' && $required ===false) $isRightFormat = true;
$exp_match = '/[0-9]{6}/';
$isRightFormat = preg_match($exp_match, $string) ? true : false;
return $isRightFormat;
}
/**
* 验证日期（2011-12-30）
* @param string $string
* @param bool $required
* @return bool
*/
public static function isDateFormat ($string, $required = false) {
$isRightFormat = false;
if($string == '' && $required === false) $isRightFormat = true;
$exp_match = '/^[0-9]{4}-[0-9]{1,2}-[0-9]{1,2}$/';
if(preg_match($exp_match, $string)) {
$dateArray = explode('-', $string);
$isRightFormat = checkdate($dateArray[1], $dateArray[2], $dateArray[0]) ? true : false;
}
return $isRightFormat;
}
/**
* 验证金钱
* @param string $string
* @param bool $required
* @return bool
*/
public static function isMoney ($string, $required = false) {
$isRightFormat = true;
if($string == '' && $required === false) $isRightFormat = true;
$exp_match = '/^[0-9]{1,8}[.]{0,1}[0-9]{0,2}$/';
$isRightFormat = preg_match($exp_match, $string) ? true : false;
return $isRightFormat;
}
}
?>

5、去掉指定的 HTML 标签

<?php
/**
* 去掉指定的html标签
* @param array $string
* @param bool $str
* @return string
*/
function _strip_tags($tagsArr,$str) {
foreach ($tagsArr as $tag) {
$p[]="/(<(?:\/".$tag."|".$tag.")[^>]*>)/i";
}
$return_str = preg_replace($p,"",$str);
return $return_str;
}
$str = "<b>您好</b><input type='text' name='' />";
_strip_tags(array("b","input"),$str); #去掉 B 标签和 INPUT 标签
?>

6、遍历文件夹文件

<?php
/*
* 遍历文件夹文件，返回数组
* @return array
*/
function list_files($folder = '', $levels = 100 ) {
if(empty($folder)) return false;
if(!$levels ) return false;
$files = array();
if ($dir = @opendir($folder)) {
while (($file = readdir($dir))!==false) {
if (in_array($file, array('.', '..')))
continue;
if (is_dir( $folder . '/' . $file )){
$files2 = list_files( $folder . '/' . $file, $levels - 1);
if( $files2 ) {
$files = array_merge($files, $files2 );
} else {
$files[] = $folder . '/' . $file . '/';
}
} else {
$files[] = $folder . '/' . $file;
}
}
}
@closedir($dir);
return $files;
}
print_r(list_files('phpmyadmin')); # 打印 phpmyadmin 下所有目录和文件
?>

7、返回文件类型

<?php
/*
* 返回文件类型
* @param string $filename 文件路径
* @return array 返回数组，键值分别为：ext、type
*/
function getFileType($filename) {
$mimes = array(
'jpg|jpeg|jpe' => 'image/jpeg',
'gif' => 'image/gif',
'png' => 'image/png',
'bmp' => 'image/bmp',
'tif|tiff' => 'image/tiff',
'ico' => 'image/x-icon',
'asf|asx|wax|wmv|wmx' => 'video/asf',
'avi' => 'video/avi',
'divx' => 'video/divx',
'mov|qt' => 'video/quicktime',
'mpeg|mpg|mpe|mp4' => 'video/mpeg',
'txt|c|cc|h' => 'text/plain',
'rtx' => 'text/richtext',
'css' => 'text/css',
'htm|html' => 'text/html',
'mp3|m4a' => 'audio/mpeg',
'ra|ram' => 'audio/x-realaudio',
'wav' => 'audio/wav',
'ogg' => 'audio/ogg',
'mid|midi' => 'audio/midi',
'wma' => 'audio/wma',
'rtf' => 'application/rtf',
'js' => 'application/javascript',
'pdf' => 'application/pdf',
'doc|docx' => 'application/msword',
'pot|pps|ppt|pptx' => 'application/vnd.ms-powerpoint',
'wri' => 'application/vnd.ms-write',
'xla|xls|xlsx|xlt|xlw' => 'application/vnd.ms-excel',
'mdb' => 'application/vnd.ms-access',
'mpp' => 'application/vnd.ms-project',
'swf' => 'application/x-shockwave-flash',
'class' => 'application/java',
'tar' => 'application/x-tar',
'zip' => 'application/zip',
'gz|gzip' => 'application/x-gzip',
'exe' => 'application/x-msdownload',
'odt' => 'application/vnd.oasis.opendocument.text',
'odp' => 'application/vnd.oasis.opendocument.presentation',
'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
'odg' => 'application/vnd.oasis.opendocument.graphics',
'odc' => 'application/vnd.oasis.opendocument.chart',
'odb' => 'application/vnd.oasis.opendocument.database',
'odf' => 'application/vnd.oasis.opendocument.formula'
);
$type = false;
$ext = false;
foreach ( $mimes as $ext_preg => $mime_match ) {
$ext_preg = '!\.(' . $ext_preg . ')$!i';
if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
$type = $mime_match;
$ext = $ext_matches[1];
break;
}
}
return compact('ext','type');
}
print_r(getFileType('123.jpg')); #Array ( [ext] => jpg [type] => image/jpeg )
?>

8、获取用户真实 IP

<?php
/**
* 获得真实IP地址
* @return string
*/
function realIp() {
static $realip = NULL;
if ($realip !== NULL) return $realip;
if (isset($_SERVER)) {
if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
foreach ($arr AS $ip) {
$ip = trim($ip);
if ($ip != 'unknown') {
$realip = $ip;
break;
}
}
} elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
$realip = $_SERVER['HTTP_CLIENT_IP'];
} else {
if (isset($_SERVER['REMOTE_ADDR'])) {
$realip = $_SERVER['REMOTE_ADDR'];
} else {
$realip = '0.0.0.0';
}
}
} else {
if (getenv('HTTP_X_FORWARDED_FOR')) {
$realip = getenv('HTTP_X_FORWARDED_FOR');
} elseif (getenv('HTTP_CLIENT_IP')) {
$realip = getenv('HTTP_CLIENT_IP');
} else {
$realip = getenv('REMOTE_ADDR');
}
}
preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
$realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';
return $realip;
}
?>

9、下载远程图片

<?php
/**
* 下载远程 HTTP 图片
* @param string $url 远程图片地址
* @param string $filename 下载后的图片名称，默认为空
* @param string $dir 保存图片目录
*/
function downHttpImage($url, $filename="", $dir) {
if($url=="") return false;
if($filename=="") {
$ext=strtolower(strrchr($url,"."));
if($ext!=".gif" && $ext!=".jpg" && $ext!=".png" && $ext!=".bmp") {
return false;
} else {
$filename=sha1(rand(1,100000)).$ext;
}
}
ob_start();
readfile($url);
$img = ob_get_contents();
ob_end_clean();
$size = strlen($img);
$filename = $dir . $filename;
$fp2=@fopen($filename, "a");
fwrite($fp2, $img);
fclose($fp2);
return $filename;
}
downHttpImage("http://imgsrc.baidu.com/baike/abpic/item/3c6d55fbb2fb4316214fa43f20a4462309f7d327.jpg", '', 'images/');
?>

10、判断字符串中是否有中文

<?php
/**
* 判断字符串中是否有中文
* @param string $str
* @return bool
*/
function isChinese($str) {
return preg_match("/[\x80-\xff]./", $str);
}
?>

11、处理图片

/**
* 输出缩略图
* @param string $filename 图片地址
* @param int $width 图片宽度
* @param int $height图片高度
*/
function handleImg($filename,$width='500',$height='500'){
$picext = end(explode('.',$filename));
$picexts = array('jpg','png','gif','jpeg');
if(in_array($picext,$picexts)) {
if($picext=='jpg' || $picext=='jpeg') {
header('Content-type: image/jpeg');
} else {
header('Content-type: image/'.$picext);
}
list($owidth, $oheight) = getimagesize($filename);
$thumb = imagecreatetruecolor($width, $height);
if($picext=='jpg' || $picext=='jpeg'){
$source = imagecreatefromjpeg($filename);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $width, $height, $owidth, $oheight);
imagejpeg($thumb);
} elseif ($picext=='gif') {
$source = imagecreatefromgif($filename);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $width, $height, $owidth, $oheight);
imagegif($thumb);
} elseif ($picext=='png'){
$source = imagecreatefrompng($filename);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $width, $height, $owidth, $oheight);
imagepng($thumb);
}
} else {
echo 'the file is not image!';
}
}
handleImg('bjdt.jpg','300','200');

12、关于 date

/**
* 获取日期段的全部日期集合
* @param string $sdate
* @param string $edate
* @return array
*/
function datesParag($sdate, $edate) {
$dates = array();
$dt_start = strtotime($sdate);
$dt_end   = strtotime($edate);
do {
array_push($dates, date('Y-m-d', $dt_start));
} while (($dt_start += 86400) <= $dt_end);
return $dates;
}
datesParag('2013-09-10', '2013-09-20');

原文地址：/article/1818863.html