PHP通用代码-PHP-Tutorial-php.cn

一个是curl的post请求函数，主要用于各平台api开发，进行请求接口的处理函数，如果你有多个平台，互相之间要传递数据，用这个函数绝对好用：

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/**
* curl访问程序接口
* @param string
* @return array
*/
function getCurlDate($url, $datas, $key) {
$datas['time'] = $_SERVER['REQUEST_TIME'] + 300;
$post_data['post'] = urlencode(authcode(serialize($datas), "ENCODE", $key));
// echo $url;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
// 我们在POST数据哦！
curl_setopt($ch, CURLOPT_POST, 1);
// 把post的变量加上
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
$output = curl_exec($ch);
// dump(curl_error($ch));
curl_close($ch);
return json_decode($output, true);
}

php获取文件的扩展名：

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/**
* @获取文件扩展名
* @$pic string 图片路径
*/
function get_file_ext($pic) {
return substr($pic, strrpos($pic, '.') + 1);
}

还有一个是可逆的加密、解密函数（加密相同的字符串都会加密成不同的字符串的，非常好用）

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/**
* 字符串加密
* @param $string 需加密的字符
* @param $operation 加密或解密
* @param $key 网站加密key，防止破解
* @return string
*/
function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
$ckey_length = 4;
$key = md5($key ? $key : '^www.itokit.com$');
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length) : substr(md5(microtime()), -$ckey_length)) : '';
$cryptkey = $keya . md5($keya . $keyc);
$key_length = strlen($cryptkey);
$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0) . substr(md5($string . $keyb), 0, 16) . $string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
for ($i = 0; $i
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
for ($j = $i = 0; $i
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for ($a = $j = $i = 0; $i
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if ($operation == 'DECODE') {
if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
return $keyc . str_replace('=', '', base64_encode($result));
}
}

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/**
* 字符串转十六进制
* @param unknown_type $s
*/
function str2hex($s) {
$r = "";
$hexes = array ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
for ($i=0; $i
$r .= ($hexes [(ord($s{$i}) >> 4)] . $hexes [(ord($s{$i}) & 0xf)]);
return $r;
}

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/**
* 十六进制转字符串
* @param unknown_type $s
*/
function hex2str($s) {
$r = "";
for ( $i = 0; $i
{
$x1 = ord($s{$i});
$x1 = ($x1>=48 && $x1
$x2 = ord($s{$i+1});
$x2 = ($x2>=48 && $x2
$r .= chr((($x1
}
return $r;
}

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/**
* 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 $string;
}
/**/
function addslashes_deep($string)
{
return is_array($string) ? array_map('addslashes_deep', $string) : addslashes($string);
}

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/**
* 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 $string;
}
/**/
function stripslashes_deep($string)
{
return is_array($string) ? array_map('stripslashes_deep', $string) : stripslashes($string);
}

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

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/**
* 获取请求ip
*
* @return ip地址
*/
function ip() {
if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
$ip = getenv('HTTP_CLIENT_IP');
} elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
$ip = getenv('HTTP_X_FORWARDED_FOR');
} elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
$ip = getenv('REMOTE_ADDR');
} elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
$ip = $_SERVER['REMOTE_ADDR'];
}
return preg_match ( '/[\d\.]{7,15}/', $ip, $matches ) ? $matches [0] : '';
}

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/**
* 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
$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
$t = ord($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);
$strcut = str_replace(array('∵', '&', '"', "'", '“', '”', '?', '', '·', '…'), array(' ', '&', '"', ''', '“', '”', '?', '', '·', '…'), $strcut);
} else {
$dotlen = strlen($dot);
$maxi = $length - $dotlen - 1;
$current_str = '';
$search_arr = array('&',' ', '"', "'", '“', '”', '?', '', '·', '…','∵');
$replace_arr = array('&',' ', '"', ''', '“', '”', '?', '', '·', '…',' ');
$search_flip = array_flip($search_arr);
for ($i = 0; $i
$current_str = ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
if (in_array($current_str, $search_arr)) {
$key = $search_flip[$current_str];
$current_str = str_replace($search_arr[$key], $replace_arr[$key], $current_str);
}
$strcut .= $current_str;
}
}
return $strcut.$dot;
}