大部分编程语言的符号是 case sensitive 的,少数(如 Basic)是 case insensitive 的。然而 PHP 两种都不是。试验下就会发现,PHP 的函数、方法以及关键字是 case insensitve 的,而变量、常量都是 case sensitive 的。 至于类,你猜是 sensitive 还是 insensitive? 猜一下! 猜一下! 猜一下! 答案是 insensitive。...
PHP正则表达式 /i, /is, /s, /isU等参数含义详解 i: 表示in-casesensitive,即大小写不敏感 s: PCRE_DOTALL,表示点号可以匹配换行符。 U: 表示PCRE_UNGREEDY,表示非贪婪,相当于perl/python语言的.*?,在匹配过程中,对于.*正则,一有匹配立即执行,而不是等.*消费了所有字符再一一回退。 PHP正则表达式模式后面...
define(string constant_name, mixed value, case_sensitive = true) 该函数有三个参数: constant_name:必选参数,常量名称,即标志符。 value:必选参数,常量的值。 case_sensitive:可选参数,指定是否大小写敏感,设定为 true 表示不敏感。 以下实例我们创建一个 区分大小写的常量, 常量值为 "Welcome to runoob.c...
例如,`strpos()`函数的第三个参数为`$case_sensitive`,设为false表示不区分大小写。 “`php $text = “This is a sample text.”; $keyword = “Sample”; if(strpos($text, $keyword, 0) !== false) { echo “包含文字”; } else { echo “不包含文字”; } “` 上述是使用PHP判断一个字符串...
可能你看的是别的环境或子环境的设定变量.. 追问: 例如define(Message,100,true).此时获取时对大小写不敏感,写成message也可以 追答:define()内置函数的参数是case_insensitive是否写法不敏感,不是case_sensitive是否写法敏感. 默认为大小写写法敏感, 追问: 谢啦 00分享举报...
PHP is case-sensitive. The script language distinguishes between uppercase and lowercase ($example ≠ $Example). The variable name must not contain spaces or line breaks (wrong: $example 1). Strings reserved by PHP for other purposes cannot be used as user-defined variables (e.g...
PHP没有改动语言代码大小写规则的环境变量吧..可能你看的是别的环境或子环境的设定变量..
7. PHP keywords are case-sensitive? Yes No Answer:B) No Explanation: No, PHP keywords (example: if, else, while, echo, etc.) are not case-sensitive. Learn & Test Your Skills Python MCQsJava MCQsC++ MCQsC MCQsJavaScript MCQsCSS MCQsjQuery MCQsPHP MCQsASP.Net MCQs ...
2. Is PHP a case-sensitive scripting language? The answer to this is both yes and no. Variables and their declaration in PHP are completely case sensitive while function names are not. For example, user-defined functions in PHP can be defined in uppercase but later referred to in lowercase...
PHP Case Sensitivity In PHP, keywords (e.g.if,else,while,echo, etc.), classes, functions, and user-defined functions are not case-sensitive. In the example below, all three echo statements below are equal and legal: Example ECHOis the same asecho: ...