一段很另类的Hello world!
define(_,'chr(');
define(__,').');
define(___,"print ");
define(____,"'!';");
define(_____,_."0x48".__._."0x65".__._."0x6C".__._."0x6C".__);
define(______,_."0x6F".__._."0x20".__._."0x77".__._."0x6F".__);
define(_______,_."0x72".__._."0x6C".__._."0x64".__);
define(________,_____.______._______);
define(_________,___.________.____);
eval(_________);
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defineHow to define multi-line macros
Oct 11, 2023 pm 01:24 PM
define defines a multi-line macro by using `\` to divide `do { \ printf("%d\n", x); \ } while (0)` into multiple lines for definition. In a macro definition, the backslash `\` must be the last character of the macro definition and cannot be followed by spaces or comments. When using `\` for line continuation, be careful to keep the code readable and make sure there is a `\` at the end of each line.
Explore the importance and role of define function in PHP
Mar 19, 2024 pm 12:12 PM
The importance and role of the define function in PHP 1. Basic introduction to the define function In PHP, the define function is a key function used to define constants. Constants will not change their values during the running of the program. Constants defined using the define function can be accessed throughout the script and are global. 2. The syntax of define function The basic syntax of define function is as follows: define("constant name","constant value&qu
What does eval mean in python?
May 22, 2019 pm 03:18 PM
eval means "evaluation" and is a built-in function in Python that is used to execute a string expression and return the calculation result of the expression; that is, when assigning a variable, the representation on the right side of the equal sign is written in the format of a string, The return value is the result of this expression. Syntax "eval(expression[, globals[, locals]])".
How to disable eval in php under win
Oct 31, 2022 am 09:33 AM
How to disable eval in PHP under win: 1. Download "PHP_diseval_extension"; 2. Find the PHP currently used by the server; 3. Open the PHP configuration file; 4. Add the "extension=diseval.so" code; 5. Restart the service.
defineHow to define conditional compilation
Oct 11, 2023 pm 01:20 PM
defineConditional compilation can be achieved using the `#ifdef`, `#ifndef`, `#if`, `#elif`, `#else` and `#endif` preprocessing directives.
php提交表单通过后,弹出的对话框怎样在当前页弹出,该如何解决
Jun 13, 2016 am 10:23 AM
php提交表单通过后,弹出的对话框怎样在当前页弹出php提交表单通过后,弹出的对话框怎样在当前页弹出而不是在空白页弹出？想实现这样的效果：而不是空白页弹出:------解决方案--------------------如果你的验证用PHP在后端，那么就用Ajax；仅供参考：HTML code
define usage of function macro
Oct 11, 2023 pm 12:00 PM
The usage of define function macro: 1. Define a simple calculation macro, "#define SQUARE(x) ((x) * (x))"; 2. Define a macro with multiple parameters, "#define MAX(a , b) ((a) > (b) ? (a) : (b))"; 3. Define macros with complex expressions, "#define ABS(x) ((x) < 0 ? -(x ) : (x))”.
The difference between typedef and define
Sep 26, 2023 am 10:41 AM
The difference between typedef and define lies in type checking, scope, readability, error handling, memory usage, etc. Detailed introduction: 1. Type checking, the type alias defined by typedef is a real type, and type checking will be performed, while the macro defined by define is just a simple text replacement, and type checking will not be performed; 2. Scope, the type alias defined by typedef The scope of is local and only valid within the current scope, while the macro defined by define is global and can be used anywhere; 3. Readability, etc.
