php项目开发常用函数锦集（-）

/**
* 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; $i<strlen($s); $i++)
$r .= ($hexes [(ord($s{$i}) >> 4)] . $hexes [(ord($s{$i}) & 0xf)]);
return $r;
}

/**
* 十六进制转字符串
* @param unknown_type $s
*/
function hex2str($s) {
$r = "";
for ( $i = 0; $i<strlen($s); $i += 2)
{
$x1 = ord($s{$i});
$x1 = ($x1>=48 && $x1<58) ? $x1-48 : $x1-97+10;
$x2 = ord($s{$i+1});
$x2 = ($x2>=48 && $x2<58) ? $x2-48 : $x2-97+10;
$r .= chr((($x1 << 4) & 0xf0) | ($x2 & 0x0f));
}
return $r;
}
/**
* 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);
}
/**
* 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);
}
/**
* 返回经addslashe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;
}


/**


* 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] : '';


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

/**
* 产生随机字符串
*
* @param int $length 输出长度
* @param string $chars 可选的 ，默认为 0123456789
* @return string 字符串
*/
function random($length, $chars = '0123456789') {
$hash = '';
$max = strlen($chars) - 1;
for($i = 0; $i < $length; $i++) {
$hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}
/**
* 将字符串转换为数组
*
* @param string $data 字符串
* @return array 返回数组格式，如果，data为空，则返回空数组
*/
function string2array($data) {
if($data == '') return array();
eval("\$array = $data;");
return $array;
}
/**
* 将数组转换为字符串
*
* @param array $data 数组
* @param bool $isformdata 如果为0，则不使用new_stripslashes处理，可选参数，默认为1
* @return string 返回字符串，如果，data为空，则返回空
*/
function array2string($data, $isformdata = 1) {
if($data == '') return '';
if($isformdata) $data = new_stripslashes($data);
return addslashes(var_export($data, TRUE));
}
/**
* 转换字节数为其他单位
*
*
* @param string $filesize 字节大小
* @return string 返回大小
*/
function sizecount($filesize) {
if ($filesize >= 1073741824) {
$filesize = round($filesize / 1073741824 * 100) / 100 .' GB';
} elseif ($filesize >= 1048576) {
$filesize = round($filesize / 1048576 * 100) / 100 .' MB';
} elseif($filesize >= 1024) {
$filesize = round($filesize / 1024 * 100) / 100 . ' KB';
} else {
$filesize = $filesize.' Bytes';
}
return $filesize;
}

本文出自 “烛光照亮天堂-IT技术之路” 博客，请务必保留此出处http://wuhai.blog.51cto.com/2023916/965914