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<!DOCTYPE html>
<!--[if IEMobile 7 ]><html class="no-js iem7"><![endif]-->
<!--[if lt IE 9]><html class="no-js lte-ie8"><![endif]-->
<!--[if (gt IE 8)|(gt IEMobile 7)|!(IEMobile)|!(IE)]><!--><html class="no-js"><!--<![endif]-->
<head>
<meta charset="utf-8">
<title>
php - 搁羽念风
</title>
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//链接新开窗口
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$('a[href^="http"]').each(function(){
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$(document).ready(function(event) {
addBlankTargetForLinks();
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<body >
<header role="banner"><hgroup>
<h1><a href="index.html">搁羽念风</a></h1>
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<div class="blog-index">
<article>
<header>
<h1 class="entry-title"><a href="15548815336055.html">php相关函数</a></h1>
<p class="meta"><time datetime="2019-04-10T15:32:13+08:00"
pubdate data-updated="true">2019/4/10</time></p>
</header>
<div class="entry-content">
<h3 id="toc_0">umask() 函数,改变umask值,使进程权限保持一致</h3>
<pre class="line-numbers"><code class="language-text">编写linux守护进程的时候,需要设置umask 这个值,用户权限屏蔽位,
当用户创建目录或者文件的时候,会有一个预设的权限 r=4,w=2,x=1
目录的预设权限是：0777 drwxrwxrwx
文件的预设权限为: 0666 -rw-rw-rw-
用这个权限减去 umask的权限,就是新建的目录或者文件的实际权限了
umask 默认值为 0022
新建文件夹权限为 0777 - 0022 = 0755
新建文件权限为 0666 - 0022 = 0644
</code></pre>
<h3 id="toc_1">pcntl_fork() 函数,在进程的当前位置产生分支(子进程)</h3>
<p>在当前进程的当前位置 产生分支(子进程), 都从fork位置继续执行, <br/>
成功时<br/>
父进程执行过程中得到的fork返回值为子进程号,子进程得到的是0<br/>
失败时<br/>
父进程将会返回 -1,不会创建子进程,并引发一个php错误</p>
<h3 id="toc_2">posix_setsid() 新建一个session终端,脱离原有终端的控制</h3>
<p>成功时<br/>
返回 session_id<br/>
失败时<br/>
返回 -1</p>
<h3 id="toc_3">php_sapi_name() 判断运行时环境</h3>
<h3 id="toc_4">extension_loaded() 检查一个扩展是否已经加载</h3>
<h3 id="toc_5">cli_set_process_title()</h3>
<p>为进程设定title <br/>
成功时<br/>
返回 true<br/>
失败时<br/>
返回 false</p>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="15540894210258.html">php 生成uuid的统一类</a></h1>
<p class="meta"><time datetime="2019-04-01T11:30:21+08:00"
pubdate data-updated="true">2019/4/1</time></p>
</header>
<div class="entry-content">
<pre class="line-numbers"><code class="language-php"><?php
class UUID {
public static function v3($namespace, $name) {
if(!self::is_valid($namespace)) return false;
// Get hexadecimal components of namespace
$nhex = str_replace(array('-','{','}'), '', $namespace);
// Binary Value
$nstr = '';
// Convert Namespace UUID to bits
for($i = 0; $i < strlen($nhex); $i+=2) {
$nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
}
// Calculate hash value
$hash = md5($nstr . $name);
return sprintf('%08s-%04s-%04x-%04x-%12s',
// 32 bits for "time_low"
substr($hash, 0, 8),
// 16 bits for "time_mid"
substr($hash, 8, 4),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 3
(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
// 48 bits for "node"
substr($hash, 20, 12)
);
}
public static function v4() {
return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 32 bits for "time_low"
mt_rand(0, 0xffff), mt_rand(0, 0xffff),
// 16 bits for "time_mid"
mt_rand(0, 0xffff),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4
mt_rand(0, 0x0fff) | 0x4000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
mt_rand(0, 0x3fff) | 0x8000,
// 48 bits for "node"
mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
);
}
public static function v5($namespace, $name) {
if(!self::is_valid($namespace)) return false;
// Get hexadecimal components of namespace
$nhex = str_replace(array('-','{','}'), '', $namespace);
// Binary Value
$nstr = '';
// Convert Namespace UUID to bits
for($i = 0; $i < strlen($nhex); $i+=2) {
$nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
}
// Calculate hash value
$hash = sha1($nstr . $name);
return sprintf('%08s-%04s-%04x-%04x-%12s',
// 32 bits for "time_low"
substr($hash, 0, 8),
// 16 bits for "time_mid"
substr($hash, 8, 4),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 5
(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
// 48 bits for "node"
substr($hash, 20, 12)
);
}
public static function is_valid($uuid) {
return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'.
'[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
}
}
// Usage
// Named-based UUID.
$v3uuid = UUID::v3('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
$v5uuid = UUID::v5('1546058f-5a25-4334-85ae-e68f2a44bbaf', 'SomeRandomString');
// Pseudo-random UUID
$v4uuid = UUID::v4();
?>
</code></pre>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="15524706279073.html">信号管理,当接收到关闭信号的时候,处理完最后的数据再关闭</a></h1>
<p class="meta"><time datetime="2019-03-13T17:50:27+08:00"
pubdate data-updated="true">2019/3/13</time></p>
</header>
<div class="entry-content">
<pre class="line-numbers"><code class="language-text"><?php
declare(ticks = 1);
function sig_handler($sig) {
switch($sig) {
case SIGINT:
error_log("接收信号SIGINT");
exit(1);
case SIGTERM:
error_log("接收信号SIGTERM");
exit(1);
case SIGHUP:
error_log("接收信号SIGHUP");
exit(1);
}
}
pcntl_signal(SIGINT, "sig_handler");
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP, "sig_handler");
while (true) {
error_log("哈哈哈");
sleep(3);
}
</code></pre>
</div>
</article>
<article>
<header>
<h1 class="entry-title"><a href="15514283796439.html">类mysql order 多值排序</a></h1>
<p class="meta"><time datetime="2019-03-01T16:19:39+08:00"
pubdate data-updated="true">2019/3/1</time></p>
</header>
<div class="entry-content">
<pre class="line-numbers"><code class="language-php">
function orderBy($data, $orders) {
$sorts = [
'desc' => SORT_DESC,
'asc' => SORT_ASC
];
$tmp = [];
foreach ($orders as $order => $sort) {
$cols = array_column($data, $order);
if(!isset($sorts[$sort])) {
return $data;
}
$tmp[] = $cols;
$tmp[] = $sorts[$sort];
}
$tmp[] = $data;
call_user_func_array('array_multisort', $tmp);
// array_multisort($cols, $sorts[$sort], $data);
print_r($data);
return $data;
}
$data = [
['score'=>2, 'date'=>'2015'],
['score'=>2, 'date'=>'2014'],
['score'=>1, 'date'=>'2017'],
['score'=>3, 'date'=>'2014'],
];
$order = [
'score' => 'asc',
'date' => 'desc'
];
$order = orderBy($data, $order);
</code></pre>
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