PHP Array 函数
PHP:指示支持该函数的最早的 PHP 版本。
array() | 创建数组。 | 3 |
array_change_key_case() | 返回其键均为大写或小写的数组。 | 4 |
array_chunk() | 把一个数组分割为新的数组块。 | 4 |
array_combine() | 通过合并两个数组来创建一个新数组。 | 5 |
array_count_values() | 用于统计数组中所有值出现的次数。 | 4 |
array_diff() | 返回两个数组的差集数组。 | 4 |
array_diff_assoc() | 比较键名和键值,并返回两个数组的差集数组。 | 4 |
array_diff_key() | 比较键名,并返回两个数组的差集数组。 | 5 |
array_diff_uassoc() | 通过用户提供的回调函数做索引检查来计算数组的差集。 | 5 |
array_diff_ukey() | 用回调函数对键名比较计算数组的差集。 | 5 |
array_fill() | 用给定的值填充数组。 | 4 |
array_filter() | 用回调函数过滤数组中的元素。 | 4 |
array_flip() | 交换数组中的键和值。 | 4 |
array_intersect() | 计算数组的交集。 | 4 |
array_intersect_assoc() | 比较键名和键值,并返回两个数组的交集数组。 | 4 |
array_intersect_key() | 使用键名比较计算数组的交集。 | 5 |
array_intersect_uassoc() | 带索引检查计算数组的交集,用回调函数比较索引。 | 5 |
array_intersect_ukey() | 用回调函数比较键名来计算数组的交集。 | 5 |
array_key_exists() | 检查给定的键名或索引是否存在于数组中。 | 4 |
array_keys() | 返回数组中所有的键名。 | 4 |
array_map() | 将回调函数作用到给定数组的单元上。 | 4 |
array_merge() | 把一个或多个数组合并为一个数组。 | 4 |
array_merge_recursive() | 递归地合并一个或多个数组。 | 4 |
array_multisort() | 对多个数组或多维数组进行排序。 | 4 |
array_pad() | 用值将数组填补到指定长度。 | 4 |
array_pop() | 将数组最后一个单元弹出(出栈)。 | 4 |
array_product() | 计算数组中所有值的乘积。 | 5 |
array_push() | 将一个或多个单元(元素)压入数组的末尾(入栈)。 | 4 |
array_rand() | 从数组中随机选出一个或多个元素,并返回。 | 4 |
array_reduce() | 用回调函数迭代地将数组简化为单一的值。 | 4 |
array_reverse() | 将原数组中的元素顺序翻转,创建新的数组并返回。 | 4 |
array_search() | 在数组中搜索给定的值,如果成功则返回相应的键名。 | 4 |
array_shift() | 删除数组中的第一个元素,并返回被删除元素的值。 | 4 |
array_slice() | 在数组中根据条件取出一段值,并返回。 | 4 |
array_splice() | 把数组中的一部分去掉并用其它值取代。 | 4 |
array_sum() | 计算数组中所有值的和。 | 4 |
array_udiff() | 用回调函数比较数据来计算数组的差集。 | 5 |
array_udiff_assoc() | 带索引检查计算数组的差集,用回调函数比较数据。 | 5 |
array_udiff_uassoc() | 带索引检查计算数组的差集,用回调函数比较数据和索引。 | 5 |
array_uintersect() | 计算数组的交集,用回调函数比较数据。 | 5 |
array_uintersect_assoc() | 带索引检查计算数组的交集,用回调函数比较数据。 | 5 |
array_uintersect_uassoc() | 带索引检查计算数组的交集,用回调函数比较数据和索引。 | 5 |
array_unique() | 删除数组中重复的值。 | 4 |
array_unshift() | 在数组开头插入一个或多个元素。 | 4 |
array_values() | 返回数组中所有的值。 | 4 |
array_walk() | 对数组中的每个成员应用用户函数。 | 3 |
array_walk_recursive() | 对数组中的每个成员递归地应用用户函数。 | 5 |
arsort() | 对数组进行逆向排序并保持索引关系。 | 3 |
asort() | 对数组进行排序并保持索引关系。 | 3 |
compact() | 建立一个数组,包括变量名和它们的值。 | 4 |
count() | 计算数组中的元素数目或对象中的属性个数。 | 3 |
current() | 返回数组中的当前元素。 | 3 |
each() | 返回数组中当前的键/值对并将数组指针向前移动一步。 | 3 |
end() | 将数组的内部指针指向最后一个元素。 | 3 |
extract() | 从数组中将变量导入到当前的符号表。 | 3 |
in_array() | 检查数组中是否存在指定的值。 | 4 |
key() | 从关联数组中取得键名。 | 3 |
krsort() | 对数组按照键名逆向排序。 | 3 |
ksort() | 对数组按照键名排序。 | 3 |
list() | 把数组中的值赋给一些变量。 | 3 |
natcasesort() | 用“自然排序”算法对数组进行不区分大小写字母的排序。 | 4 |
natsort() | 用“自然排序”算法对数组排序。 | 4 |
next() | 将数组中的内部指针向前移动一位。 | 3 |
pos() | current() 的别名。 | 3 |
prev() | 将数组的内部指针倒回一位。 | 3 |
range() | 建立一个包含指定范围的元素的数组。 | 3 |
reset() | 将数组的内部指针指向第一个元素。 | 3 |
rsort() | 对数组逆向排序。 | 3 |
shuffle() | 把数组中的元素按随机顺序重新排列。 | 3 |
sizeof() | count() 的别名。 | 3 |
sort() | 对数组排序。 | 3 |
uasort() | 使用用户自定义的比较函数对数组中的值进行排序并保持索引关联。 | 3 |
uksort() | 使用用户自定义的比较函数对数组中的键名进行排序。 | 3 |
usort() | 使用用户自定义的比较函数对数组中的值进行排序。 | 3 |

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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