参考-这个符号在PHP中是什么意思?

两个冒号在PHP中是什么意思? PHP令牌名称T_PAAMAYIM_NEKUDOTAYIM是什么意思? ::(双冒号)和->有什么区别? (箭头)在PHP中? PHP中最新的静态绑定到底是什么? static :: staticFunctionName() 意外的T_PAAMAYIM_NEKUDOTAYIM，期望使用T_NS_Separator \ 命名空间 PHP中的反斜杠-是什么意思? 在PHP(5.3+)中，\(反斜杠)有什么作用? -> 类和对象 什么是-" PHP运算符调用了，大声读出代码时怎么说? 在何处使用对象运算符-"在PHP中? ::(双冒号)和->有什么区别? (箭头)在PHP中? PHP语法$ var1-> $ var2是什么意思? ->"是什么意思?在PHP中是指/指代? => 数组 &=;>"是什么意思?在PHP中意味着什么? 使用=>在PHP中 $ k是什么? foreach中的$ v($ ex是$ k => $ v)是什么意思? ^ 按位运算符 按位运算符XOR('^')如何工作? ^在PHP中是什么意思? >> 按位运算符 >>是什么?在PHP中意味着什么? << 按位运算符 PHP中的奇怪打印行为? <<< Heredoc或Nowdoc <<< END在PHP中是什么意思? PHP表达式<<< EOB 在PHP中，<<<"是什么意思?代表? 在PHP中使用<<< CON PHP中的这种语法是什么? = 分配运算符 3个不同的等式 == 比较运算符 PHP相等(==双重等于)和身份(===三次等于)比较运算符有何区别? PHP！=和==运算符 3个不同的等式 PHP中的类型变乱和(严格)大于/小于的比较 === 比较运算符 什么是"==="是什么意思? PHP相等(==双重等于)和身份(===三次等于)比较运算符有何区别? 3个不同的等式 PHP中的类型变乱和(严格)大于/小于的比较 !== 比较运算符 PHP中的！==比较运算符是什么意思? 在PHP中！==和！=之间是否有区别? != 比较运算符 PHP！=和==运算符 在PHP中！==和！=之间是否有区别? 比较，！==与！= <>有什么区别?和！= <> 比较运算符 PHP运算符<> PHP的<>运算符 <>有什么区别?和！= PHP中的类型变乱和(严格)大于/小于的比较 <=> 比较运算符(自PHP 7.0起) 宇宙飞船(三向比较)运算符 | 按位运算符 和||运算符? 使用单个管道的作用是什么'|'在功能参数中可以吗? || 逻辑运算符 和||运算符? PHP-和/或关键字 究竟是什么||是什么意思? PHP中or运算符的行为 ~ 按位运算符 此〜运算符在这里是什么意思? + 算术运算符，数组运算符 +数组中的运算符是否在PHP中? +=和-= 分配运算符 + =的作用是什么? 我的PHP文档中的$ page-= 1是什么意思? ++和-- 递增/递减运算符 了解增量 下面的答案 .= 分配运算符 在PHP中.=和+ =有什么区别? 要了解一行PHP . 字符串运算符 在将回声与收益连接起来时，句点和逗号之间的区别是什么? 什么是. (点)在PHP中执行? , 函数参数 在将回声与收益连接起来时，句点和逗号之间的区别是什么? , 变量声明 逗号在变量声明中是什么意思? $$ 变量 PHP中的$$(美元或双美元)是什么意思? 什么是"$$"在PHP中 $ function()和$$ variable ` 执行运算符 所谓的反引号是什么? <?= 打开标签 此符号在PHP中的含义是<?= 在PHP中'<?='是什么意思? <?=是什么意思? [] 数组(PHP 5.4以来的短语法) ) PHP数组...空括号的含义是什么? [] 是什么意思 Php array_push()与myArray [] 从PHP数组中读取[]是什么意思? 数组的简写:文字$var = []空数组 <? 打开和关闭标签 可以使用PHP短标签吗? ... 参数解压缩(自PHP 5.6起) ** 幂运算(自PHP 5.6起) # 单行外壳样式注释 我可以在PHP中使用哈希来注释吗? :? 可为空的返回类型 php方法参数类型带有问号的提示(?type )解决方案 递增/递减运算符 ++增量运算符 --减法运算符 Example Name Effect---------------------------------------------------------------------++$a Pre-increment Increments $a by one, then returns $a.$a++ Post-increment Returns $a, then increments $a by one.--$a Pre-decrement Decrements $a by one, then returns $a.$a-- Post-decrement Returns $a, then decrements $a by one. 这些变量可以在变量之前或之后.如果放在变量之前，先对变量进行递增/递减操作，然后返回结果.如果将变量放在变量之后，则首先返回该变量，然后执行递增/递减操作.例如:$apples = 10;for ($i = 0; $i < 10; ++$i) { echo 'I have ' . $apples-- . " apples. I just ate one.\n";} 实时示例在使用++$i的情况下，因为它更快. $i++将具有相同的结果.预增量要快一点，因为它确实增加了变量，然后返回"结果.后增量创建一个特殊变量，在其中复制第一个变量的值，只有在使用第一个变量后，才将其值替换为第二个.但是，必须使用$apples--，因为首先要显示当前的苹果数，然后然后要减去一个苹果.您还可以在PHP中增加字母:$i = "a";while ($i < "c") { echo $i++;}到达z后，接着是aa，依此类推. 请注意，字符变量可以递增但不能递减，即使如此，仅支持纯ASCII字符(a-z和A-Z). 堆栈溢出帖子: 了解增量What is this?This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.Why is this?It used to be hard to find questions about operators and other syntax tokens.¹The main idea is to have links to existing questions on Stack Overflow, so it's easier for us to reference them, not to copy over content from the PHP Manual.Note: Since January 2013, Stack Overflow does support special characters. Just surround the search terms by quotes, e.g. [php] "==" vs "==="What should I do here?If you have been pointed here by someone because you have asked such a question, please find the particular syntax below. The linked pages to the PHP manual along with the linked questions will likely answer your question then. If so, you are encouraged to upvote the answer. This list is not meant as a substitute to the help others provided.The ListIf your particular token is not listed below, you might find it in the List of Parser Tokens.& Bitwise Operators or ReferencesWhat does it mean to start a PHP function with an ampersand?Understanding PHP & (ampersand, bitwise and) operatorPHP "&" operatorDifference between & and && in PHPWhat does "&" mean here in PHP?What does "&" mean in this case?What does the "&" sign mean in PHP?What does this signature mean (&) in PHP?How does the "&" operator work in a PHP function?What does & in &2 mean in PHP?When should I use a bitwise operator?Is there ever a need to use ampersand in front of an object? (&$)=& ReferencesReference assignment operator in PHP, =&What do the "=&" and "&=" operators in PHP mean?What do the '&=' and '=&' operators do?What does =& mean in PHP?&= Bitwise OperatorsWhat do the "=&" and "&=" operators in PHP mean?What do the '&=' and '=&' operators do?&& Logical Operators'AND' vs '&&' as operatorDifference between & and && in PHPIs there any difference between "and" and "&&" operators in PHP?PHP - and / or keywords% Arithmetic OperatorsWhat does the percent sign mean in PHP?What is the PHP operator % and how do I use it in real-world examples?!! Logical OperatorsDouble not (!!) operator in PHP@ Error Control OperatorsWhat is the use of the @ symbol in PHP?'At' symbol before variable name in PHP: @$_POSTPHP functions and @functionsShould I use @ in my PHP code?What does @ mean in PHP??: Ternary OperatorWhat are the PHP operators "?" and ":" called and what do they do??: operator (the 'Elvis operator') in PHPWhere can I read about conditionals done with "?" and ":" (colon)?Using PHP 5.3 ?: operator?? Null Coalesce Operator (since PHP 7)C#'s null coalescing operator (??) in PHP?string?int?array?bool?float Nullable return type declaration (since PHP 7.1)Nullable return type declaration: Alternative syntax for control structures, Ternary OperatorWhat is ":" in PHP?What does ":" mean in PHP?:: Scope Resolution OperatorWhat do two colons mean in PHP?What's the meaning of the PHP token name T_PAAMAYIM_NEKUDOTAYIM?What's the difference between :: (double colon) and -> (arrow) in PHP?What exactly are late static bindings in PHP?static::staticFunctionName()Unexpected T_PAAMAYIM_NEKUDOTAYIM, expecting T_NS_Separator\ NamespacesBackslash in PHP -- what does it mean?What does a \ (backslash) do in PHP (5.3+)?-> Classes And ObjectsWhat is the "->" PHP operator called and how do you say it when reading code out loud?Where do we use the object operator "->" in PHP?What's the difference between :: (double colon) and -> (arrow) in PHP?What does the PHP syntax $var1->$var2 mean?What does "->" mean/refer to in PHP?=> ArraysWhat does "=>" mean in PHP?Use of => in PHPWhat does $k => $v in foreach($ex as $k=>$v) mean?^ Bitwise OperatorsHow does the bitwise operator XOR ('^') work?What does ^ mean in PHP?>> Bitwise OperatorsWhat does >> mean in PHP?<< Bitwise OperatorsStrange print behaviour in PHP?<<< Heredoc or NowdocWhat does <<<END mean in PHP?PHP expression <<<EOBIn PHP, what does "<<<" represent?Using <<<CON in PHPWhat's this kind of syntax in PHP?= Assignment OperatorsThe 3 different equals== Comparison OperatorsHow do the PHP equality (== double equals) and identity (=== triple equals) comparison operators differ?PHP != and == operatorsThe 3 different equalsType-juggling and (strict) greater/lesser-than comparisons in PHP=== Comparison OperatorsWhat does "===" mean?How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators differ?The 3 different equalsType-juggling and (strict) greater/lesser-than comparisons in PHP!== Comparison OperatorsWhat does !== comparison operator in PHP mean?Is there a difference between !== and != in PHP?!= Comparison OperatorsPHP != and == operatorsIs there a difference between !== and != in PHP?comparing, !== versus !=What is the difference between <> and !=<> Comparison OperatorsPHP operator <>PHP's <> operatorWhat is the difference between <> and !=Type-juggling and (strict) greater/lesser-than comparisons in PHP<=> Comparison Operators (since PHP 7.0)Spaceship (three way comparison) operator| Bitwise OperatorsWhat is the difference between the | and || operators?What Does Using A Single Pipe '|' In A Function Argument Do?|| Logical OperatorsWhat is the difference between the | and || operators?PHP - and / or keywordsWhat exactly does || mean?The behaviour of the or operator in PHP~ Bitwise OperatorsWhat does this ~ operator mean here?+ Arithmetic Operators, Array Operators+ operator for array in PHP?+= and -= Assignment OperatorsWhat is += used for?What does `$page -= 1` in my PHP document mean?++ and -- Incrementing/Decrementing OperatorsUnderstanding IncrementingAnswer below.= Assignment OperatorsWhat is the difference between .= and += in PHP?To understand a line of PHP. String OperatorsDifference between period and comma when concatenating with echo versus return?What does a . (dot) do in PHP?, Function ArgumentsDifference between period and comma when concatenating with echo versus return?, Variable DeclarationsWhat do commas mean in a variable declaration?$$ Variable VariablesWhat does $$ (dollar dollar or double dollar) mean in PHP?what is "$$" in PHP$function() and $$variable` Execution OperatorWhat are the backticks `` called?<?= Short Open TagsWhat does this symbol mean in PHP <?=What does '<?=' mean in PHP?What does <?= mean?[] Arrays (short syntax since PHP 5.4)PHP arrays... What is/are the meaning(s) of an empty bracket?What is the meaning of []Php array_push() vs myArray[]What does [] mean when reading from a PHP array?Shorthand for arrays: literal $var = [] empty array<? Opening and Closing tagsAre PHP short tags acceptable to use?... Argument unpacking (since PHP 5.6)** Exponentiation (since PHP 5.6)# One-line shell-style commentCan I use hashes for comments in PHP?:? Nullable return typesphp method argument type hinting with question mark (?type) 解决方案 Incrementing / Decrementing Operators++ increment operator-- decrement operatorExample Name Effect---------------------------------------------------------------------++$a Pre-increment Increments $a by one, then returns $a.$a++ Post-increment Returns $a, then increments $a by one.--$a Pre-decrement Decrements $a by one, then returns $a.$a-- Post-decrement Returns $a, then decrements $a by one.These can go before or after the variable.If put before the variable, the increment/decrement operation is done to the variable first then the result is returned. If put after the variable, the variable is first returned, then the increment/decrement operation is done.For example:$apples = 10;for ($i = 0; $i < 10; ++$i) { echo 'I have ' . $apples-- . " apples. I just ate one.\n";}Live exampleIn the case above ++$i is used, since it is faster. $i++ would have the same results.Pre-increment is a little bit faster because it really increments the variable and after that 'returns' the result. Post-increment creates a special variable, copies there the value of the first variable and only after the first variable is used, replaces its value with second's.However, you must use $apples--, since first, you want to display the current number of apples, and then you want to subtract one from it.You can also increment letters in PHP:$i = "a";while ($i < "c") { echo $i++;}Once z is reached aa is next, and so on. Note that character variables can be incremented but not decremented and even so only plain ASCII characters (a-z and A-Z) are supported.Stack Overflow Posts:Understanding Incrementing 这篇关于参考-这个符号在PHP中是什么意思?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！