What is <=> (the 'Spaceship' Operator) in PHP 7?

This question already has an answer here: Reference — What does this symbol mean in PHP? 18 answers This <=> operator will offer combined comparison in that it will : Return 0 if values on either side are equal Return 1 if value on the left is greater Return -1 if the value on the right is greater The rules used by the combined comparison operator are same as the currently used compa

什么是PHP 7中的<=>('Spaceship'运算符)?

这个问题在这里已经有了答案: 参考 - 这个符号在PHP中的含义是什么? 18个答案 该<=>运营商将提供组合比较,因为它将: Return 0 if values on either side are equal Return 1 if value on the left is greater Return -1 if the value on the right is greater 组合比较运算符使用的规则与PHP当前使用的比较运算符相同。 < , <= , == , >=和> 。 那些来自Perl或Ruby编程背景的人可能已经熟悉为

Replace character UNLESS surrounded by specific tag

First, yes, I know that regex should never be used to parse HTML, however, in this situation I'm taking a long string of text (output of var_dump(), actually) and using several regexes to transform it into XHTML so I know exactly what tags I will be dealing with. The last two regexes in my sequence look for the curly braces and transform into pieces of XHTML. It works great EXCEPT for when

替换被特定标记包围的字符UNLESS

首先,是的,我知道正则表达式不应该用于解析HTML,但是,在这种情况下,我需要一长串文本(实际上是var_dump()的输出),并使用多个正则表达式将其转换为XHTML,所以我确切知道我将处理的标签。 我序列中的最后两个正则表达式查找大括号并转换为XHTML片段。 它工作的很好,除了当大括号包含在一个字符串变量中时,我在前一个正则表达式中的<var></var>标记之间输出。 所以,目前,我正在使用: /s*{s*/u 。

Curly Braces Notation in PHP

I was reading source of OpenCart and I ran into such expression below. Could someone explain it to me: $quote = $this->{'model_shipping_' . $result['code']}->getQuote($shipping_address); In the statement, there is a weird code part that is $this->{'model_shipping_' . $result['code']} which has {} and I wonder what that is? It looks an object to me but I am not real

PHP中的大括号表示法

我正在阅读OpenCart的源代码,我在下面看到了这样的表达式。 有人可以向我解释: $quote = $this->{'model_shipping_' . $result['code']}->getQuote($shipping_address); 在声明中,有一个奇怪的代码部分 $this->{'model_shipping_' . $result['code']} 它有{} ,我想知道那是什么? 它看起来是一个对象,但我不确定。 花括号用于表示PHP中的字符串或变量插值。 它允许你创建'变量函数&

PHP curly brace syntax for member variable

First question on SO and it's a real RTM candidate. But I promise you I've looked and can't seem to find it. I'll happily do a #headpalm when it turns out to be a simple thing that I missed. Trying to figure out Zend Framework and came across the following syntax: $this->_session->{'user_id'} I have never seen the curly braces syntax used to access what appears to be a

PHP成员变量的大括号语法

关于SO的第一个问题,它是一个真正的RTM候选人。 但我向你保证我看起来似乎无法找到它。 如果事实证明我错过了一件简单的事情,我会很乐意做一个#headpalm。 试图找出Zend Framework并遇到以下语法: $this->_session->{'user_id'} 我从来没有见过花括号语法来访问看起来是一个成员变量。 它和它有什么不同 $this->_session->user_id 我假设_session是无关紧要的,但将它包括在问题中,因为它可能不是。

PHP Comments # vs //

Lately I've been using # instead of // for doing single line comments inside my Code. However, I see must of the people prefer // . Is there a particular reason for preferring them instead of # ? Performance? File weight? Anything? It doesn't change a single thing, I'd say ; it's just a matter of habits : // comes from C , and exists in several languages used by lots of

PHP评论#vs //

最近我一直在使用#代替//在代码中进行单行注释。 但是,我看到人们更喜欢// 。 是否有一个特别的原因,宁愿他们而不是# ? 性能? 文件重量? 什么? 它不会改变一件事,我会说; 这只是一个习惯问题: //来自C ,并且以很多人使用的几种语言存在。 #来自外壳和Perl,并没有那么多“重要”的语言形式存在// -如此少的人使用它。 为什么这两种PHP都可用? 那么,PHP已经建立在了解C,Shell和Perl的人身上,并且他们

available php Opening and Closing Tags

PHP documentation states: <%= $variable; # This is a shortcut for "<% echo . . ." %> <?= expression ?> This is a shortcut for "<? echo expression ?>" ...short tags and ASP style tags, and can be turned on and off from the php.ini configuration file. So I attempted to try out the "shortcuts" for ASP style tags and short tags to verify these statements. I got th

可用的PHP打开和关闭标签

PHP文档指出: <%= $variable; # This is a shortcut for "<% echo . . ." %> <?= expression ?> This is a shortcut for "<? echo expression ?>" ...短标签和ASP样式标签,并且可以从php.ini配置文件打开和关闭。 所以我试图尝试ASP风格标签和短标签的“快捷方式”来验证这些语句。 我懂了: 第2行解析错误:语法错误,意外的'echo'(T_ECHO)位于C: Users Robert Documents web devel

PHP Difference between array() and []

I'm writing a PHP app and I want to make sure it will work with no errors. The original code: <?php $data = array('name' => 'test', 'id' => 'theID'); echo form_input($data); ?> Would the following work with no errors or is not recommended for some reason? <?= form_input(['name' => 'test', 'id' => 'theID']); ?> Are there any difference? I've

数组之间的差异()和[]

我正在编写一个PHP应用程序,我想确保它能够正常工作。 原始代码: <?php $data = array('name' => 'test', 'id' => 'theID'); echo form_input($data); ?> 以下工作是否会出现错误,或者出于某种原因不推荐? <?= form_input(['name' => 'test', 'id' => 'theID']); ?> 有什么区别吗? 我已经在PHP.net中再次查看有关array()和方括号[]的短数组方法的数据,但我不确定。 而

how to get number of how much the string is common in a array

Hey I have an array with a bunch of data I did a array_count_values , and now I've got something like this: $bots = array_count_values($all_bots); arsort($bots); Array ( ["abc"] => 9 ["xyz"] => 1 ) I just want to get the number. So just the 9. Does someone can tell me how do I get just the number? $bots = array_count_values($all_bots); arsort($bots) echo current($bots); Afte

如何获取字符串在数组中常见的数量

嘿,我有一堆数据的阵列 我做了一个array_count_values ,现在我有这样的东西: $bots = array_count_values($all_bots); arsort($bots); Array ( ["abc"] => 9 ["xyz"] => 1 ) 我只想得到号码。 所以只是9。 有人能告诉我如何得到这个数字吗? $bots = array_count_values($all_bots); arsort($bots) echo current($bots); 排序后,您可以使用current()获取第一个值。 但是,我建议放弃排序操作并使用max来

Creating default object from empty value in PHP?

I see this error only after upgrading my PHP environment to PHP 5.4 and beyond. The error points to this line of code: Error: Creating default object from empty value Code: $res->success = false; Do I first need to declare my $res object? Your new environment may have E_STRICT warnings enabled in error_reporting for PHP versions <= 5.3.x, or simply have error_reporting set to at

在PHP中从空值创建默认对象?

只有在将我的PHP环境升级到PHP 5.4及更高版本后才会看到此错误。 错误指向这行代码: 错误: 从空值创建默认对象 码: $res->success = false; 我首先需要声明我的$res对象吗? 对于PHP版本<= 5.3.x,您的新环境可能会在error_reporting启用E_STRICT警告,或者仅将error_reporting设置为至少E_WARNING且PHP版本> = 5.4。 当$res为NULL或尚未初始化时触发该错误: $res = NULL; $res->success = false; /

content from divs into textarea

I'd like to transfer text from all div's with specific class to the textarea on the same page. How can I do that? for example: < div class="test1" > Example1 < /div > < div class="test2" > Example2 < /div > < div class="test1" > Example3 < /div > < div class="test3" > Example4 < /div > I would like to transfer the content of div class test1 and in the

内容从divs到textarea

我想将具有特定类的所有div的文本传输到同一页面上的textarea。 我怎样才能做到这一点? 例如: < div class="test1" > Example1 < /div > < div class="test2" > Example2 < /div > < div class="test1" > Example3 < /div > < div class="test3" > Example4 < /div > 我想转移div class test1的内容,并在textarea中显示“Example1”和“Example3”。 请任何帮助! JavaScript或PHP 约