Table of Contents
PHP中的数组处理函数实例总结,php数组函数实例
您可能感兴趣的文章:
Home php教程 php手册 PHP中的数组处理函数实例总结,php数组函数实例

PHP中的数组处理函数实例总结,php数组函数实例

Jun 13, 2016 am 08:47 AM
php function string array

PHP中的数组处理函数实例总结,php数组函数实例

本文实例总结了PHP中的数组处理函数。分享给大家供大家参考,具体如下:

<&#63;php
 //改变数组键的大小写
 $arr1=array("a"=>"Lamp","db"=>"database","LANGUAGE"=>"PHP");
 print_r(array_change_key_case($arr1,CASE_UPPER));
 echo "<br/>";
 print_r(array_change_key_case($arr1,CASE_LOWER));
 echo "<hr><br/>";
 //将一个数组分割成多个 第三个参数设定是否保留键
 $arr2=array('a','b','c','d','e','f','g');
 print_r(array_chunk($arr2,2,true));
 echo "<br/>";
 print_r(array_chunk($arr2,2,false));
 echo "<hr><br/>";
 //array array_diff_assoc ( array $array1 , array $array2 [, array $ ... ] ) 返回一个数组,
 //该数组包括了所有在 array1 中但是不在任何其它参数数组中的值
 //键不同也算
 $arr3=array('a'=>'green','b'=>'brown','c'=>'red');
 $arr4=array('a'=>'green','yellow','red');
 print_r(array_diff_assoc($arr3,$arr4));
 echo "<hr><br/>";
 //array_diff ( array $array1 , array $array2 [, array $ ... ] )
 //返回一个数组,该数组包括了所有在 array1 中但是不在任何
 //其它参数数组中的值,键不同不算
 print_r(array_diff($arr3,$arr4));
 echo "<hr><br>";
 //array_fill ( int $start_index , int $num , mixed $value )
 //用 value参数的值将一个数组填充 num 个条目,
 //键名由 start_index 参数指定的开始。
 print_r(array_fill(-5,8,"banana"));
 echo "<hr><br/>";
 //array_flip ( array $trans )
 //返回一个反转后的 array,例如 trans 中的键名变成了值,
 //而 trans 中的值成了键名。
 $arr5=array('a'=>'1',"b"=>"2","c","d","e");
 print_r(array_flip($arr5));
 echo "<hr><br/>";
 //array_map ( callback $callback , array $arr1 [, array $... ] )
 //返回一个数组,该数组包含了 arr1 中的所有单元经过 callback 作用过
 //之后的单元。callback接受的参数数目应该和传递给 array_map()
 //函数的数组数目一致。 
 function cube($n){
 return $n*$n;
 }
 $arr6=array(1,2,3,4,5);
 print_r(array_map("cube",$arr6));
 echo "<hr><br/>";
 //array_merge_recursive ( array $array1 [, array $... ] )
 //将一个或多个数组的单元合并起来,一个数组中的值附加在前一个数组
 //的后面。返回作为结果的数组。如果输入的数组中有相同的字符串键名,
 //则这些值会被合并到一个数组中去,这将递归下去,因此如果一个值本身
 //是一个数组,本函数将按照相应的条目把它合并为另一个数组。然而,如
 //果数组具有相同的数组键名,后一个值将不会覆盖原来的值,而是附加到
 //后面。
 $arr7=array("color"=>array("favorite"=>"red"),5);
 $arr8=array(10,array("favorite"=>"yellow","blue"));
 print_r(array_merge_recursive($arr7,$arr8));
 echo "<hr><br/>";
 //array_reduce ( array $input , callback $function [, int $initial ] 
 //将回调函数 function 迭代地作用到 input 数组中的每一个单元中,从而将数组
 //简化为单一的值。如果指定了可选参数 initial,该参数将被当成是数组中的第
 //一个值来处理,或者如果数组为空的话就作为最终返回值。如果数组为空并且没
 //有传递 initial 参数,array_reduce() 返回 NULL。
 function rsum($v,$w){
 $v+=$w;
 return $v;
 }
 function rmul($v,$w){
 $v*=$w;
 return $v;
 }
 $a=array(1,2,3,4,5);
 $x=array();
 $b=array_reduce($a,"rsum");
 $c=array_reduce($a,"rmul",10);
 $d=array_reduce($x,"rsum",1);
 echo $b."\t\t".$c."\t\t".$d."\n";
 echo "<hr><br/>";
 //array_replace ( array &$array , array &$array1 [, array &$array2 [, array &$... ]] )
 //函数使用后面数组元素的值替换第一个 array 数组的值。如果一个键存在于第一
 //个数组同时也存在于第二个数组,它的值将被第二个数组中的值替换。如果一个
 //键存在于第二个数组,但是不存在于第一个数组,则会在第一个数组中创建这个
 //元素。如果一个键仅存在于第一个数组,它将保持不变。如果传递了多个替换数
 //组,它们将被按顺序依次处理,后面的数组将覆盖之前的值。
 $base=array("orange","banana","apple","raspberry");
 $replacements=array(0=>"pineapple",4=>"cherry");
 $replacements2=array(0=>"grape");
 //print_r(array_replace($base,$replacements,$replacements2));
 //echo "<hr><br/>";
 //array_splice ( array &$input , int $offset [, int $length [, array $ replacement ]] )
 //把 input 数组中由 offset 和 length指定的单元去掉,如果提供了 replacement
 // 参数,则用 replacement数组中的单元取代。返回一个包含有被移除单元的数组
 // 。注意 input 中的数字键名不被保留。如果省略 length,则移除数组中从 
 // offset到结尾的所有部分。如果指定了 length并且为正值,则移除这么多单元
 // 。如果指定了 length并且为负值,则移除从 offset 到数组末尾倒数 length 
 // 为止中间所有的单元。小窍门:当给出了 replacement 时要移除从 offset到
 // 数组末尾所有单元时,用 count($input) 作为 length。
 $input=array("red","green","blue","yellow");
 array_splice($input,1,-1);
 print_r($input);
 echo "<hr><br/>";
 //key ( array &$array )
 //返回数组中当前单元的键名。
 $fruit=array("fruit1"=>"apple","fruit2"=>"orange","fruit3"=>"grape",
 "fruit4"=>"apple","fruit5"=>"apple");
 while($fruit_name=current($fruit)){
 if($fruit_name=='apple'){
  echo key($fruit)."<br/>";
 }
 next($fruit);
 }
 echo "<hr><br/>";
&#63;>

Copy after login

希望本文所述对大家PHP程序设计有所帮助。

您可能感兴趣的文章:

  • php数组函数array_key_exists()小结
  • PHP中对数组的一些常用的增、删、插操作函数总结
  • PHP数组和explode函数示例总结
  • PHP递归调用数组值并用其执行指定函数的方法
  • PHP数组相关函数汇总
  • php通过array_merge()函数合并两个数组的方法
  • php通过array_push()函数添加多个变量到数组末尾的方法
  • php通过array_unshift函数添加多个变量到数组前端的方法
  • php通过array_shift()函数移除数组第一个元素的方法
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1655
14
PHP Tutorial
1252
29
C# Tutorial
1226
24
Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

How do you parse and process HTML/XML in PHP? How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

PHP Program to Count Vowels in a String PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

PHP and Python: Comparing Two Popular Programming Languages PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

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.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

PHP: A Key Language for Web Development PHP: A Key Language for Web Development Apr 13, 2025 am 12:08 AM

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP in Action: Real-World Examples and Applications PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

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.

See all articles