介绍几个php4中非常有用的数组函数转载关联数组等同于PERL里的哈希数组。以前我一直以为PHP里没...
介绍几个 php4 中非常有用的"数组"函数 1 void extract (array var_array [, int extract_type ][, string prefix]]) 把一个关联数组展开为变量名和变量的值，如果有冲突则由后面的参数指定处理方法！ 如：
"blue", "size" => "medium", "shape" => "sphere"); extract ($var_array, EXTR_PREFIX_SAME, "wddx"); print "$color, $size, $shape, $wddx_sizen"; ?> 2 array compact (mixed varname [, mixed ...]) 和上面的函数相反，把变量名和变量的值保存到关联数组里面！ 如： $city = "San Francisco"; $state = "CA"; $event = "SIGGRAPH"; $location_vars = array ("city", "state"); $result = compact ("event", "nothing_here", $location_vars); $result 结果为 array ("event" => "SIGGRAPH", "city" => "San Francisco", "state" => "CA"). 3 bool in_array (mixed needle, array haystack) 判断数组中是否有这个值 4 void natsort (array array) 以自然数的方法排序数组，这时 12 将排在2的后面 $array1 = $array2 = array ("img12.png","img10.png","img2.png","img1.png"); sort($array1); echo "标准排序n"; print_r($array1); natsort($array2); echo "n自然排序n"; print_r($array2); 代码输出为: 标准排序 Array ( [0] => img1.png [1] => img10.png [2] => img12.png [3] => img2.png ) 自然排序 Array ( [3] => img1.png [2] => img2.png [1] => img10.png [0] => img12.png )
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1666
14
1425
52
1327
25
1273
29
1252
24
PHP array key value flipping: Comparative performance analysis of different methods
May 03, 2024 pm 09:03 PM
The performance comparison of PHP array key value flipping methods shows that the array_flip() function performs better than the for loop in large arrays (more than 1 million elements) and takes less time. The for loop method of manually flipping key values takes a relatively long time.
The Art of PHP Array Deep Copy: Using Different Methods to Achieve a Perfect Copy
May 01, 2024 pm 12:30 PM
Methods for deep copying arrays in PHP include: JSON encoding and decoding using json_decode and json_encode. Use array_map and clone to make deep copies of keys and values. Use serialize and unserialize for serialization and deserialization.
Complete collection of excel function formulas
May 07, 2024 pm 12:04 PM
1. The SUM function is used to sum the numbers in a column or a group of cells, for example: =SUM(A1:J10). 2. The AVERAGE function is used to calculate the average of the numbers in a column or a group of cells, for example: =AVERAGE(A1:A10). 3. COUNT function, used to count the number of numbers or text in a column or a group of cells, for example: =COUNT(A1:A10) 4. IF function, used to make logical judgments based on specified conditions and return the corresponding result.
Application of PHP array grouping function in data sorting
May 04, 2024 pm 01:03 PM
PHP's array_group_by function can group elements in an array based on keys or closure functions, returning an associative array where the key is the group name and the value is an array of elements belonging to the group.
Introduction to the online score checking platform (convenient and fast score query tool)
Apr 30, 2024 pm 08:19 PM
A fast score query tool provides students and parents with more convenience. With the development of the Internet, more and more educational institutions and schools have begun to provide online score check services. To allow you to easily keep track of your child's academic progress, this article will introduce several commonly used online score checking platforms. 1. Convenience - Parents can check their children's test scores anytime and anywhere through the online score checking platform. Parents can conveniently check their children's test scores at any time by logging in to the corresponding online score checking platform on a computer or mobile phone. As long as there is an Internet connection, whether at work or when going out, parents can keep abreast of their children's learning status and provide targeted guidance and help to their children. 2. Multiple functions - in addition to score query, it also provides information such as course schedules and exam arrangements. Many online searches are available.
C++ Function Exception Advanced: Customized Error Handling
May 01, 2024 pm 06:39 PM
Exception handling in C++ can be enhanced through custom exception classes that provide specific error messages, contextual information, and perform custom actions based on the error type. Define an exception class inherited from std::exception to provide specific error information. Use the throw keyword to throw a custom exception. Use dynamic_cast in a try-catch block to convert the caught exception to a custom exception type. In the actual case, the open_file function throws a FileNotFoundException exception. Catching and handling the exception can provide a more specific error message.
Detailed introduction of Samsung S24ai functions
Jun 24, 2024 am 11:18 AM
2024 is the first year of AI mobile phones. More and more mobile phones integrate multiple AI functions. Empowered by AI smart technology, our mobile phones can be used more efficiently and conveniently. Recently, the Galaxy S24 series released at the beginning of the year has once again improved its generative AI experience. Let’s take a look at the detailed function introduction below. 1. Generative AI deeply empowers Samsung Galaxy S24 series, which is empowered by Galaxy AI and brings many intelligent applications. These functions are deeply integrated with Samsung One UI6.1, allowing users to have a convenient intelligent experience at any time, significantly improving the performance of mobile phones. Efficiency and convenience of use. The instant search function pioneered by the Galaxy S24 series is one of the highlights. Users only need to press and hold
Best Practices for Deep Copying PHP Arrays: Discover Efficient Methods
Apr 30, 2024 pm 03:42 PM
The best practice for performing an array deep copy in PHP is to use json_decode(json_encode($arr)) to convert the array to a JSON string and then convert it back to an array. Use unserialize(serialize($arr)) to serialize the array to a string and then deserialize it to a new array. Use the RecursiveIteratorIterator to recursively traverse multidimensional arrays.
