⑴ php读取文件规则，只能一行一行读取不能一行中间隔开读取
<?php
$c = getLine('./a.txt', 10); // 读取a.txt文件第10行内容
echo $c;
/**
* 获取指定行内容
*
* @param $file 文件路径
* @param $line 行数
* @param $length 指定行返回内容长度
*/
function getLine($file, $line, $length = 4096){
$returnTxt = null; // 初始化返回
$i = 1; // 行数
$handle = @fopen($file, "r");
if ($handle) {
while (!feof($handle)) {
$buffer = fgets($handle, $length);
if($line == $i) $returnTxt = $buffer;
$i++;
}
fclose($handle);
}
return $returnTxt;
}
⑵ 请教PHP的异步处理，pcntl
client:
<?php
$client=newGearmanClient();
$client->addServer('127.0.0.1', 4730);//本机可以直接addServer(),默认服务器端使用4730端口
$client->setCompleteCallback('completeCallBack');//先绑定才有效
$result1=$client->do('say','do');//do是同步进行，进行处理并返回处理结果。
$result2=$client->doBackground('say','doBackground');//异步进行，只返回处理句柄。
$result3=$client->addTask('say','addTask');//添加任务到队列,同步进行？通过添加task可以设置回调函数。
$result4=$client->addTaskBackground('say','addTaskBackground');//添加后台任务到队列，异步进行？
$client->runTasks();//运行队列中的任务，只是do系列不需要runTask()。
echo'result1:';
var_mp($result1);
echo'<br/>';
echo'result2:';
var_mp($result2);
echo'<br/>';
echo'result3:';
var_mp($result3);
echo'<br/>';
echo'result4:';
var_mp($result4);
echo'<br/>';
//绑定回调函数，只对addTask有效
functioncompleteCallBack($task)
{
echo'CompleteCallback！handle result:'.$task->data().'<br/>';
}
worker:
<?php
$worker=newGearmanWorker();
$worker->addServer();
$worker->addFunction('say',function(GearmanJob$job){
$workload=$job->workload();//接收client传递的数据
echo'receive data:'.$workload.PHP_EOL;
returnstrrev($workload);//仅作反转处理
});
//无际循环运行，gearman内部已有处理，不会出现占用过高死掉的情况
while($worker->work()){
if($worker->returnCode() !== GEARMAN_SUCCESS){
echo'error'.PHP_EOL;
}
}
以上client输出：
CompleteCallback！handle result:ksaTdda
result1:string(2) “od”
result2:string(17) “H:iZ943bixttyZ:87″
result3:object(GearmanTask)#2 (0) { }
result4:object(GearmanTask)#3 (0) { }
worker输出：
receive data:do
receive data:doBackground
receive data:addTaskBackground
receive data:addTask
⑶ php5.6的file_put_contents问题求解
你的代码确实不怎么规范；
有地方不明白你要干
<?php
$txt = intval(file_get_contents('cly.txt'));
file_put_contents('cly.txt', strval($txt + 1));
echo $txt;
?>
第一句话 intval是强制转换成整数。
file_get_contents返回类型是bool|string
结果就是 文件不存 返回的是false 而在一般的语言中都是false 本身就是0. 如果存在肯定返回的是里面的字符串。而任何的字符串只要不是数字开头 intval都会返回0。
而php 中 Warning 不会影响程序继续运行。
所以结果就是第一句话返回的文件不存在就是0，
至于你说的404描述错误 。这个不可能产生。
还有代码真的不严谨。
应该这样
$filename='cly.txt';
if(!file_exists($filename)){//文件不存在的时候
file_put_contents($filename, '');//生成文件
}
$txt = intval(file_get_contents($filename)) ;
file_put_contents($filename, strval($txt + 1));
echo $txt;
这样就不会出现你说的问题了
⑷ php中如何换行
用正则的换行，结束位置加上 \n。例如：$text = “我是文本\n”。
简介：
PHP，一个嵌套的缩写名称，是英文超级文本预处理语言的缩写。PHP 是一种 HTML 内嵌式的语言，PHP与微软的ASP颇有几分相似，都是一种在服务器端执行的嵌入HTML文档的脚本语言，语言的风格有类似于C语言。
安装：
它可以比 CGI或者Perl更快速地执行动态网页。用PHP做出的动态页面与其他的编程语言相比，PHP是将程序嵌入到HTML文档中去执行，执行效率比完全生成HTML标记的CGI要高许多；PHP还可以执行编译后代码，编译可以达到加密和优化代码运行，使代码运行更快。
发展：
PHP原始为 Personal Home Page的缩写，现已经正式更名为 "PHP: Hypertext Preprocessor"的缩写。注意不是“Hypertext Preprocessor”的缩写，这种将名称放到定义中的写法被称作递归缩写。PHP于19 ISAPI筛选器94年由Rasmus Lerdorf创建，刚刚开始是Rasmus Lerdorf 为了要维护个人网页而制作的一个简单的用Perl语言编写的程序。最初这些工具程序用来显示 Rasmus Lerdorf 的个人履历，以及统计网页流量。
⑸ php 换行 PHP_EOL变量
一个小小的换行，其实在不同的平台有着不同的实现
本来在unix世界换行就用/n来代替，但是windows为了体现他的不同，就用/r/n，更有意思的是在mac中用/r
因此unix系列用 /n
windows系列用 /r/n
mac用 /r
第一种方式
str_replace(array("/r","/n","/r/n"),"",$string);
第二种方式就用正则表达示
$str = preg_replace('/\s*/', '', $str);
第三种方式
这里不得不重新看一下php那些已经定义好的变量
PHP_EOL就是其中的一个，代表php的换行符，这个变量会根据平台而变，在windows下会是/r/n，在linux下是/n，在mac下是/r
$str = str_replace(PHP_EOL, '', $str);
⑹ 前端使用CryptoJS AES加密 ,后端php解密问题
PHP7.1 已经不能用mcrypt了，所以我用的是openssl_encrypt和openssl_decrypt。
<?php
$data="ThisisanAEScryptdemo.";
$privateKey="";//KEY16字节用aes-128-cbc，32字节用aes-256-cbc
$iv="4490d2ded4f2d4ad";//AES的IV是16个字节
//加密
//$encrypted=openssl_encrypt($data,'aes-128-cbc',$privateKey,0,$iv);
$encrypted=openssl_encrypt($data,'aes-256-cbc',$privateKey,0,$iv);
echo$encrypted,PHP_EOL;
//解密
$encryptedData=$encrypted;
//$decrypted=openssl_decrypt($encryptedData,'aes-128-cbc',$privateKey,0,$iv);
$decrypted=openssl_decrypt($encryptedData,'aes-256-cbc',$privateKey,0,$iv);
echo($decrypted);
输出结果如下：
EPcMQRXA53/hRkPyILFI4fF/9sW2X53tLiDT26khNsA=
ThisisanAEScryptdemo.
⑺ PHP替换回车换行符的三种方法
目录
小小的回车换行，在不同的平台有着不同的实现。
为什么要这样，世界是多样的！
所以，程序在不同的平台上，需要作不同的处理来替换 回车换行 符。
下面介绍3种PHP中替换 回车换行 的方法，
注意， 最后一种 才是最优最方便的哦～～～
这种方式 效率最差 。
这种方式效率其次，不过写法略长。
这里不得不重新看一下PHP的 预定义常量 ，
PHP_EOL 就是其中的一个，代表PHP的换行符，
这个常量会根据平台不同而不同，在Windows下是 ，Linux下是 ，而Mac下是
所以，最优方法就是：
参考资料：
⑻ Sublime Text，php代码格式化插件codeformatter 设置PHP代码格式时报错 怎么处理
{
"codeformatter_debug": false,
"codeformatter_php_options":
{
"syntaxes": "php", // Syntax names which must process PHP formatter
"php_path": "这里改成你php的路径", // Path for PHP executable, e.g. "/usr/lib/php" or "C:/Program Files/PHP/php.exe". If empty, uses command "php" from system environments
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"php55_compat": false, // PHP 5.5 compatible mode
"psr1": false, // Activate PSR1 style
"psr1_naming": false, // Activate PSR1 style - Section 3 and 4.3 - Class and method names case
"psr2": true, // Activate PSR2 style
"indent_with_space": 4, // Use spaces instead of tabs for indentation
"enable_auto_align": true, // Enable auto align of = and =>
"visibility_order": true, // Fixes visibility order for method in classes - PSR-2 4.2
"smart_linebreak_after_curly": true, // Convert multistatement blocks into multiline blocks
// Enable specific transformations. Example: ["ConvertOpenTagWithEcho", "PrettyPrintDocBlocks"]
// You can list all available transformations from command palette: CodeFormatter: Show PHP Transformations
"passes": [],
// Disable specific transformations
"excludes": []
},
"codeformatter_js_options":
{
"syntaxes": "javascript,json", // Syntax names which must process JS formatter
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"indent_size": 4, // indentation size
"indent_char": " ", // Indent character
"indent_with_tabs": false, // Indent with one tab (overrides indent_size and indent_char options)
"eol": "\n", // EOL symbol
"preserve_newlines": false, // whether existing line breaks should be preserved,
"max_preserve_newlines": 10, // maximum number of line breaks to be preserved in one chunk
"space_in_paren": false, // Add padding spaces within paren, ie. f( a, b )
"space_in_empty_paren": false, // Add padding spaces within paren if parent empty, ie. f( )
"e4x": false, // Pass E4X xml literals through untouched
"jslint_happy": false, // if true, then jslint-stricter mode is enforced. Example function () vs function()
"space_after_anon_function": false, // Space after anonimouse functions
"brace_style": "collapse", // "collapse" | "expand" | "end-expand". put braces on the same line as control statements (default), or put braces on own line (Allman / ANSI style), or just put end braces on own line.
"keep_array_indentation": false, // keep array indentation.
"keep_function_indentation": false, // keep function indentation.
"eval_code": false, // eval code
"unescape_strings": false, // Decode printable characters encoded in xNN notation
"wrap_line_length": 0, // Wrap lines at next opportunity after N characters
"unindent_chained_methods": false, // Unindent chained method calls
"break_chained_methods": false, // Break chained method calls across subsequent lines
"end_with_newline": false, // Add new line at end of file
"comma_first": false, // Add comma first
"operator_position": "before-newline" // Operator position: before-newline, after-newline, preserve-newline
},
"codeformatter_css_options":
{
"syntaxes": "css,less", // Syntax names which must process CSS formatter
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"indent_size": 4, // Indentation size
"indent_char": " ", // Indentation character
"indent_with_tabs": false, // Indent with one tab (overrides indent_size and indent_char options)
"selector_separator_newline": false, // Add new lines after selector separators
"end_with_newline": false, // Add new line of end in file
"newline_between_rules": false, // Add new line between rules
"space_around_combinator": false, // Space around combinator
"eol": "\n" // EOL symbol
},
"codeformatter_scss_options":
{
"syntaxes": "scss,sass", // Indentation size
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"indent_size": 4, // Indentation size
"indent_char": " ", // Indentation character
"indent_with_tabs": false, // Indent with one tab (overrides indent_size and indent_char options)
"selector_separator_newline": false, // Add new lines after selector separators
"end_with_newline": false, // Add new line of end in file
"newline_between_rules": false, // Add new line between rules
"space_around_combinator": false, // Space around combinator
"eol": "\n" // EOL symbol
},
"codeformatter_html_options":
{
"syntaxes": "html,blade,asp,xml", // Syntax names which must process HTML formatter
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"formatter_version": "bs4", // Which formatter to use. Current options are "bs4" and "regexp". If an error occurs while loading the bs4 formatter, the regexp formatter will automatically be used
"indent_size": 4, // indentation size
"indent_char": " ", // Indentation character
"indent_with_tabs": false, // Indent with one tab (overrides indent_size and indent_char options)
"exception_on_tag_mismatch": false, // If the last closing tag is not at the same indentation level as the first opening tag, there's probably a tag mismatch in the file
"expand_javascript": false, // (Under construction) Expand JavaScript inside of <script> tags (also affects CSS purely by coincidence)
"expand_tags": false, // Expand tag attributes onto new lines
"minimum_attribute_count": 2, // Minimum number of attributes needed before tag attributes are expanded to new lines
"first_attribute_on_new_line": false, // Put all attributes on separate lines from the tag (only uses 1 indentation unit as opposed to lining all attributes up with the first)
"rece_empty_tags": false, // Put closing tags on same line as opening tag if there is no content between them
"rece_whole_word_tags": false, // Put closing tags on same line as opening tag if there is whole word between them
"custom_singletons": "" // Custom singleton tags for various template languages outside of the HTML5 spec
},
"codeformatter_python_options":
{
"syntaxes": "python", // Syntax names which must process Python formatter
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"indent_size": 1, // indentation size
"indent_with_tabs": true, // Indent with tabs or spaces
"max_char": 80, // Width of output lines in characters.
"assignment": " = ", // This is how the assignment operator is to appear.
"function_param_assignment": "=", // This is how function-parameter assignment should appear.
"function_param_sep": ", ", // This is how function parameters are separated.
"list_sep": ", ", // This is how list items are separated.
"subscript_sep": "=", // This is how subscripts are separated.
"dict_colon": ": ", // This separates dictionary keys from values.
"slice_colon": ":", // this separates the start:end indices of slices.
"comment_prefix": "# ", // This is the sentinel that marks the beginning of a commentary string.
"shebang": "#!/usr/bin/env python", // Hashbang, a line-one comment naming the Python interpreter to Unix shells.
"boilerplate": "", // Standard code block (if any). This is inserted after the mole doc string on output.
"blank_line": "", // This is how a blank line is to appear (up to the newline character).
"keep_blank_lines": true, // If true, preserve one blank where blank(s) are encountered.
"add_blank_lines_around_comments": true, // If true, set off comment blocks with blanks.
"add_blank_line_after_doc_string": true, // If true, add blank line after doc strings.
"max_seps_func_def": 3, // Split lines containing longer function definitions.
"max_seps_func_ref": 5, // Split lines containing longer function calls.
"max_seps_series": 5, // Split lines containing longer lists or tuples.
"max_seps_dict": 3, // Split lines containing longer dictionary definitions.
"max_lines_before_split_lit": 2, // Split string literals containing more newline characters.
"left_margin": "", // This is how the left margin is to appear.
"normalize_doc_strings": false, // If true, normalize white space in doc strings.
"leftjust_doc_strings": false, // If true, left justify doc strings.
"wrap_doc_strings": false, // If true, wrap doc strings to max_char.
"leftjust_comments": false, // If true, left justify comments.
"wrap_comments": false, // If true, wrap comments to max_char.
"double_quoted_strings": false, // If true, use quotes instead of apostrophes for string literals.
"single_quoted_strings": false, // If true, use apostrophes instead of quotes for string literals.
"can_split_strings": false, // If true, longer strings are split at the max_char.
"doc_tab_replacement": "....", // This literal replaces tab characters in doc strings and comments.
// Optionally preserve unassigned constants so that code to be tidied
// may contain blocks of commented-out lines that have been no-op'ed
// with leading and trailing triple quotes. Python scripts may declare
// constants without assigning them to a variables, but CodeFormatter
// considers this wasteful and normally elides them.
"keep_unassigned_constants": false,
// Optionally omit parentheses around tuples, which are superfluous
// after all. Normal CodeFormatter behavior will be still to include them
// as a sort of tuple display analogous to list displays, dict
// displays, and yet-to-come set displays.
"parenthesize_tuple_display": true,
// When CodeFormatter splits longer lines because max_seps
// are exceeded, the statement normally is closed before the margin is
// restored. The closing bracket, brace, or parenthesis is placed at the
// current indent level. This looks ugly to "C" programmers. When
// java_style_list_dedent is True, the closing bracket, brace, or
// parenthesis is brought back left to the indent level of the enclosing
// statement.
"java_style_list_dedent": false
},
"codeformatter_vbscript_options":
{
"syntaxes": "vbscript", // Syntax names which must process VBScript formatter
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"indent_size": 1, // indentation size
"indent_char": "\t", // Indentation character
"indent_with_tabs": true, // Indent with one tab (overrides indent_size and indent_char options)
"preserve_newlines": true, // Preserve existing line-breaks
"max_preserve_newlines": 10, // Maximum number of line-breaks to be preserved in one chunk
"opening_tags": "^(Function .*|Sub .*|If .* Then|For .*|Do While .*|Select Case.*)", // List of keywords which open a new block
"middle_tags": "^(Else|ElseIf .* Then|Case .*)$", // List of keywords which divide a block, but neither open or close the block
"closing_tags": "(End Function|End Sub|End If|Next|Loop|End Select)$" // List of keywords which close an open block
},
"codeformatter_coldfusion_options":
{
"syntaxes": "coldfusion,cfm,cfml", // Syntax names which must process Coldfusion Markup Language formatter
"format_on_save": false, // Format on save. Either a boolean (true/false) or a string regexp tested on filename. Example : "^((?!.min.|vendor).)*$"
"indent_size": 2, // indentation size
"indent_char": " ", // Indentation character
"indent_with_tabs": false, // Indent with one tab (overrides indent_size and indent_char options)
"exception_on_tag_mismatch": false, // If the last closing tag is not at the same indentation level as the first opening tag, there's probably a tag mismatch in the file
"expand_javascript": false, // (Under construction) Expand JavaScript inside of <script> tags (also affects CSS purely by coincidence)
"expand_tags": false, // Expand tag attributes onto new lines
"minimum_attribute_count": 2, // Minimum number of attributes needed before tag attributes are expanded to new lines
"first_attribute_on_new_line": false, // Put all attributes on separate lines from the tag (only uses 1 indentation unit as opposed to lining all attributes up with the first)
"rece_empty_tags": false, // Put closing tags on same line as opening tag if there is no content between them
"rece_whole_word_tags": false, // Put closing tags on same line as opening tag if there is whole word between them
"custom_singletons": "" // Custom singleton tags for various template languages outside of the HTML5 spec
}
}